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182 Chps 30,36,37,38

worktest questions for Unit 2

Which of the following is an ongoing trend in the evolution of land plants? A) elimination of sperm cells or nuclei B) decrease in the size of the leaf C) replacement of roots by rhizoids D) reduction of the gametophyte phase of the life cycle E) increasing reliance on water to bring sperm and egg together (30-2) D
Plants with a dominant sporophyte are successful on land partly because: A) their gametophytes are completely enclosed within sporophyte tissue B) having no stomata, they lose less water C) eggs and sperm need not be produced D) they disperse by means of seeds E) diploid plants experience fewer mutations than haploids (30 A
In addition to seeds, which of the following characteristics are unique to the seed-producing plants? A) use of air currents as a dispersal agent B) lignin present in cell walls C) megaphylls D) sporopollenin E) pollen (30-4) E
Which of the following most closely represents the male gametophyte of seed-bearing plants? A) pollen grain interior B) fertilized egg C) microspore mother cell D) ovule E) embryo sac (30-5) A
There are two seed plant stains; one stains sporophyte tissue blue and the other stains gametophyte tissue red. If pollen grains are exposed to both stains and then rinsed off what should occur? A) pollen grains will be pure blue B) pollen grains will have blue interiors and red exteriors C) pollen grains are independent from the plant so they won't absorb either stain D) pollen grains will be pure red E) pollen grains will have red interiors and blue exteriors (30-6) E
The main way that pine trees disperse their offspring is by using: A) fruits that are eaten by animals B) spores C) windblown seeds D) flagellated sperm swimming through water E) squirrels to bury cones (30-7) C
Generally, wind pollination is most likely to be found in seed plants that grow: A) in relative isolation from other members of the same species B) in well-drained soils C) in dense, single-species stands D) along coastlines where prevailing winds blow from the land out to sea E) close to the ground (30-8) C
Which of these statements correctly describes a portion of the pine life cycle? A) seeds are produced in pollen-producing cones B) female gametophytes use mitosis to produce eggs C) pollen grains contain female gametophytes D) a pollen tube slowly digests its way through the triploid endosperm (30-9) B
Which of these statements is true of the pine life cycle? A) the pine tree is a gametophyte B) cones are homologous to the capsules of moss plants C) double fertilization is a relatively common phenomenon D) conifer pollen grains contain male gametophytes E) male and female gametophytes are in close proximity during gamete synthesis (30-10) D
Arrange the following structures, which can be found on male pine trees, from the largest structure to the smallest (most inclusive to least): 1. sporophyte 2. microspores 3. microsporangia 4. pollen cone 5. pollen nuclei A) 1,4,3,2,5 B) 1,2,3,5,4 C) 1,4,2,3,5 D) 4,3,2,5,1 E) 4,1,2,3,5 (30-11) A
Refer to description in worktest 30 Which feature of cycads distinguishes them from most other gymnosperms? 1. they have exposed ovules 2. they have flagellated sperm 3. they are pollinated by animals A) 1 only B) 2 and 3 C) 2 only D) 1,2,and 3 E) 3 only (30-12) B
Refer to description in worktest 30 Which feature of cycads makes them similar to many angiosperms? 1. they have exposed ovules 2. they have flagellated sperm 3. they are pollinated by animals A) 3 only B) 2 and 3 C) 1,2,and 3 D) 1 only E) 2 only (30-13) A
Refer to description in worktest 30 Which structure is common to both gymnosperms and angiosperms? A) anthers B) stigma C) ovule D) ovary E) carpel (30-14) C
Which sex and generation produces fruit? A) male gametophyte B) female gametophyte C) female sporophyte D) male sporophyte (30-15) C
Which sex and generation produces the egg cell in the embryo sac? A) male gametophyte B) female sporophyte C) female gametophyte D) male sporophyte (30-16) C
Which of the following is a characteristic of all angiosperms? A) carpels that contain microsporangia B) ovules that are not contained within ovaries C) double internal fertilization D) complete reliance on wind as the pollinating agent E) free-living gametophytes (30-17) C
Which of the following is true concerning flowering plants? A) the flower includes sporophyte tissue B) the gametophyte generation is dominant C) the gametophyte generation is what we see when looking at a large plant D) the sporophyte generation consists of relatively few cells within the flower E) the sporophyte generation isn't photosynthetic (30- A
Which of these statements is true of monocots? A) each possesses multiple cotyledons B) they are currently thought to be polyphyletic C) the veins of their leaves form a netlike pattern D) they, along with the eudicots, magnoliids, and basal angiosperms, are currently placed in the phylum Anthophyta E) they are the clade that includes most of our crops, except the cereal grains (30-1 D
Which is a true statement about angiosperm carpels? A) they surround and nourish the female gametophyte B) they consist of anther and stamen C) they are features of the gametophyte generation D) they are structures that directly produce male gametes E) they consist of highly modified microsporangia (30 A
The generative cell of male angiosperm gametophytes is haploid. This cell divides to produce two haploid sperm cells. What type of cell division does the generative cell undergo to produce these sperm cells? A) meiosis without subsequent cytokinesis B) binary fission C) mitosis without subsequent cytokinesis D) mitosis E) meiosis (30-21) D
Angiosperm double fertilization is so-called because it features the formation of: A) one embryo from two eggs fertilized by a single sperm cell B) two embryos from one egg and two sperm cells C) two embryos from two sperm cells and two eggs D) one embryo from one egg fertilized by two sperm cells E) one embryo involving one sperm cell and of endosperm involving a second sperm cell (30-22) E
How have fruits contributed to the success of angiosperms? A) by attracting insects to the pollen inside B) by nourishing the plants that make them C) by producing sperm and eggs inside a protective coat D) by producing triploid cells via double fertilization E) by facilitating dispersal of seeds (30-23) E
In flowering plants, meiosis occurs specifically in the: A) embryos B) gametes C) gametophytes D) endosperm E) spore mother cells (30-24) E
Which of the following flower parts develops into the pulp of a fleshy fruit? A) ovary B) stigma C) style D) ovule E) micropyle (30-25) A
Angiosperms are the most successful terrestrial plants. Which of these features is unique to them and helps account for their success? A) sperm cells without flagella B) dominant gametophytes C) wind pollination D) embryos enclosed within seed coats E) fruits enclosing seeds (30-26) E
Over human history, which process has been most important in improving the features of plants that have long been used by humans as staple foods? A) artificial selection B) pesticide and herbicide application C) natural selection D) sexual selection E) genetic engineering (30-27) A
A botanist was visiting a tropical region for the purpose of discovering plants with medicinal properties. All of the following might be ways of identifying potentially useful plants except: A) observing which plants sick animals seek out B) observing which plants are the most used food plants C) asking local people which plants they use as medicine D) observing which plants animals do not eat E) collecting plants and subjecting them to chemical analysis (30-28) B
A plant developed a mineral deficiency after being treated with a fungicide. What is the most probable cause of this deficiency? A) proton pumps reversed the membrane potential B) Active transport of minerals was inhibited C) mycorrhizal fungi were killed D) the genes for the synthesis of transport proteins were destroyed E) mineral receptor proteins in the plant membrane were not functioning (36-1) C
If you were to prune the shoot tips of a plant, what would be the effect on the plant and the leaf area index? A) bushier plants - lower leaf area index B) tall plants - higher leaf area index C) tall plants - lower leaf area index D) bushier plants - higher leaf area index E) short plants - lower leaf area index (36-2) D
Active transport involves all of the following except the: A) hydrolysis of ATP B) pumping of solutes across the membrane C) a specific transport protein in the membrane D) transport of solute against a concentration gradient E) diffusion of solute through the lipid bilayer of a membrane (36-3) E
The amount and direction of movement of water in plants can always be predicted by measuring which of the following? A) dissolved solutes B) pressure potential C) proton gradients D) water potential E) number of aquaporins (36-4) D
An open beaker of pure water has a water potential of: A) -0.0000001 MPa B) +0.07 MPa C) +0.23 MPa D) -0.23 MPa E) 0.0 (zero) (36-5) E
What is the role of proton pumps in root hair cells? A) acquire minerals from the soil B) eliminate excess electrons C) establish ATP gradients D) pressurize xylem transport E) A and D only (36-6) A
Which of the following is not an important component of the long-distance transport process in plants? A) bulk flow from source to sink B) the cohesion of water molecules C) a negative water potential D) the active transport of solutes E) the root parenchyma (36-7) E
Pine seedlings grown in sterile potting soil grow much slower than seedlings grown in soil from the area where the seeds were collected. This is most likely because: A) the sterilization process kills the root hairs as they emerge from the seedling B) water and mineral uptake is faster when the mycorrhizae are present C) sterilization removes essential nutrients from the soil D) normal symbiotic fungi are not present in the sterilized soil E) B and D (36-8) E
A water molecule could move all the way through a plant from soil to root to leaf to air and pass through a living cell only once. This living cell would be a part of which structure? A) a guard cell B) the Casparian strip C) the endodermis D) the root cortex E) the root epidermis (36-9) C
The following factors may sometimes play a role in the movement of sap through xylem. Which one depends on the direct expenditure of ATP by the plant? A) evaporation of water from leaves B) bulk flow of water in the root apoplast C) cohesion among water molecules D) concentration of ions in the symplast E) capillarity of water within the xylem (36-10) D
One is most likely to see guttation in small plants when the: A) root pressure exceeds transpiration pull B) preceding evening was hot, windy, and dry C) transpiration rates are high D) roots are not absorbing minerals from the soil E) water potential in the stele of the root is high (36-11) A
What is the main force by which most of the water within xylem vessels moves toward the top of a tree? A) active transport of ions into the stele B) atmospheric pressure on roots C) osmosis in the root D) the force of root pressure E) evaporation of water through stoma (36-12) E
Water potential is generally most negative in which of the following parts of a plant? A) xylem vessels in roots B) cells of the root cortex C) xylem vessels in leaves D) root hairs E) mesophyll cells of the leaf (36-13) E
Transpiration in plants requires all of the following except: A) transport through tracheids B) cohesion between water molecules C) adhesion of water molecules to cellulose D) evaporation of water molecules E) active transport through xylem cells (36-14) E
Active transport would be least important in the normal functioning of which of the following plant tissue types? A) stem xylem B) leaf transfer cells C) root endodermis D) root phloem E) leaf mesophyll (36-15) A
Guard cells do which of the following? A) accumulate K+ and close the stomata B) protect the endodermis C) contain chloroplasts that import K+ directly into the cells D) help balance the photosynthesis-transpiration compromise E) guard against mineral loss through the stomata (36-16) D
All of the following normally enter the plant through the roots except: A) potassium B) carbon dioxide C) calcium D) nitrogen E) water (36-17) B
Photosynthesis begins to decline when leaves wilt because: A) CO2 accumulates in the leaves and inhibits the enzymes needed for photosynthesis B) insufficient water for photolysis during light reactions C) wilted cells can't absorb the red and blue wavelengths of light D) chloroplasts within wilted cells are unable to photosynthesize E) stomata close, preventing CO2 entry into the leaf (36-1 E
The earliest land plants were nonvascular plants that grew leafless photosynthetic shoots above the shallow freshwater in which they lived True or False True
Guard cells are the only cells in the epidermis that contain chloroplasts and can undergo photosynthesis. This is important because: A) photosynthesis provides the energy necessary for contractile proteins to flex and open the guard cells B) guard cells will produce the O2 necessary to power active transport C) ATP is required to power proton pumps in the guard cell membranes D) chloroplasts sense when light is available so that guard cells will open E) A and C (36-20) C
What is the driving force for the movement of materials in the phloem of plants? A) transpiration of water through the stomates B) gravity C) root pressure D) a difference in osmotic water potential between the source and the sink E) adhesion of water to phloem sieve tubes (36-21) D
Phloem transport of sucrose can be described as going from "source to sink." Which of the following would not normally function as a sink? A) storage organ in summer B) shoot tip C) mature leaf D) growing root E) growing leaf (36-22) C
Which of the following is a correct statement about sugar movement in phloem? A) movement can occur both upward and downward in the plant B) sugar is translocated from sinks to sources C) sugar transport does not require energy D) only phloem cells with nuclei can perform sugar movement E) diffusion can account for the observed rates of transport (36-23) A
Water flows into the source end of a sieve tube because: A) sucrose has been dumped from the sieve tube by active transport B) sucrose has diffused into the sieve tube, making it hypertonic C) water pressure outside the sieve tube forces in water D) the companion cell of a sieve tube actively pumps in water E) sucrose has been actively transported into the sieve tube, making it hypertonic (36-24) E
According to the pressure flow hypothesis of phloem transport: A) the pressure in the phloem of a root is greater than the pressure in the phloem of a leaf D) water is actively transported to the source region of the phloem to create turgor pressure B) high turgor pressure in the source & transpiration water loss in the sink moves solutes through the phloem C) formation of starch from sugar in the sink increases the osmotic conc. E) solute moves from high conc. in the source to low conc. in the sin E (36-25)
Which of the following describes the fate of most of the water taken up by a plant? A) it makes cell elongation possible B) it is used to keep cells turgid C) it is lost during transpiration D) it is used as a hydrogen source in photosynthesis E) it is used as a solvent (37-1) C
A soil well suited for the growth of most plants would have all of the following properties except: A) air spaces B) abundant humus C) good drainage D) a high pH E) high cation exchange capacity (37-2) D
What soil(s) is(are) the most fertile? A) silt only B) both humus and loam C) loam only D) humus only E) clay only (37-3) B
Which soil mineral is most likely leached away during a hard rain? A) NO3- B) H+ C) Na+ D) Ca++ E) K+ (37-4) A
The N-P-K percentages on a package of fertilizer refer to the: A) relative percentages of organic and inorganic nutrients in the fertilizer B) percentages of three important mineral nutrients C) proportions of three different nitrogen sources D) percentages of manure collected from different types of animals E) total protein content of the three major ingredients of the fertilizer (37-5) B
Most of the mass of organic material of a plant comes from: A) water B) nitrogen C) atmospheric oxygen D) carbon dioxide E) soil minerals (37-6) D
Micronutrients are needed in very small amounts because: A) most of them are mobile in the plant B) most serve mainly as cofactors of enzymes C) they play only a minor role in the growth and health of the plant D) only the most actively growing regions of the plants require micronutrients E) most are supplied in large enough quantities in seeds (37-7) B
A farming commitment that embraces a variety of methods that are conservation-minded, environmentally safe, and profitable is called: A) nitrogen fixation B) responsible irrigation C) genetic engineering D) sustainable agriculture E) hydroponics (37-8) D
Some plants extract and concentrate heavy metals from the soil. A current use for such plants is: A) to help locate suitable sites for toxic waste storage B) phytoremediation of polluted sites C) nitrogen fixation by symbiotic bacteria in root nodules D) to concentrate rare metals for medicinal use E) to minimize soil erosion in arid lands (37-9) B
You are conducting an experiment on plant growth. You take a plant fresh from the soil that weighs 5 kg. Then you dry the plant overnight and determine the dry weight to be 1 kg. How much of the dry weight would you expect to be organic molecules? A) 1 kg B) 4 grams C) 960 grams D) 1 gram E) 40 grams (37-10) C
In hydroponic culture, what is the purpose of bubbling air into the solute? A) to inhibit the growth of anaerobic bacteria B) to keep dissolved nutrients evenly distributed C) to provide CO2 for photosynthesis D) to provide oxygen to the root cells E) to inhibit the growth of aerobic algae (37-11) D
Which of the following essential nutrients plays an essential role in the opening and closing of the stomatal aperture? A) Mg B) Fe C) K D) Bo E) H (37-12) C
A growing plants exhibits chlorosis of the leaves in the entire plant. The chlorosis is probably due to a deficiency of which of the following macronutrients? A) calcium B) carbon C) hydrogen D) oxygen E) nitrogen (37-13) E
Which element is important in the formation and stability of cell walls? A) molybdenum B) chlorine C) manganese D) zinc E) calcium (37-14) E
What is the major function of magnesium in plants? A) a component of chlorophyll B) required to regenerate phospophenolpyruvate in C4 and CAM plants C) component of DNA and RNA D) component of lignin-biosynthetic enzymes E) active in amino acid formation (37-15) A
Reddish-purple coloring of leaves, especially along the margins of young leaves, is a typical symptom of deficiency of which element? A) M++ B) P C) K+ D) C E) N (37-16) B
Which is meant by the term chlorosis? A) the uptake of the micronutrient chlorine by a plant B) the formation of chlorophyll within the thylakoid membranes of a plant C) a contamination of glassware in hydroponic culture D) release of negatively charged minerals such as chloride from clay particles in soil E) the yellowing of leaves due to decreased chlorophyll production (37-17) E
Iron deficiency is often indicated by yellowing in newly formed leaves. This suggests that iron: A) is concentrated in the xylem of older leaves B) is found in leghemoglobin and reduces the amount available to new plant parts C) is tied up in formed chlorophyll molecules D) is concentrated in older leaves E) is a relatively immobile nutrient in plants (37-18) E
Why is nitrogen fixation such an important process? A) fixed nitrogen is most often the limiting factor in plant growth B) nitrogen fixation can only be done by certain prokaryotes C) nitrogen fixation is very expensive in terms of metabolic energy D) nitrogen fixers are sometimes symbiotic with legumes E) nitrogen-fixing capacity can be genetically engineered (37-19) A
In a root nodule, the gene coding for nitrogenase: A) is absent in active bacteroids B) is inactivated by leghemoglobin C) is part of the Rhizobium chromosome D) protects the nodule from nitrogen E) is found in the cells of the pericycle (37-20) C
Among important crop plants, nitrogen-fixing nodules are most commonly an attribute of: A) corn B) wheat C) legumes D) cabbage and other members of the brassica family E) members of the potato family (37-21) C
Which of the following is a true statement about nitrogen fixation in root nodules? A) the plant contributes the nitrogenase enzyme B) the process tends to deplete nitrogen compounds in the soil C) the process is relatively inexpensive in terms of ATP costs D) the bacteria of the nodule are autotrophic E) leghemoglobin helps maintain a low O2 concentration within the nodule (37-22 E
What is the mutualistic association between roots and fungi called? A) mycorrhizae B) parasitism C) root hair enhancement D) nitrogen fixation E) Rhizobium infection (37-23) A
Mycorrhizae enhance plant nutrition mainly by: A) stimulating the development of root hairs B) absorbing water and minerals through the fungal hyphae C) converting atmospheric nitrogen to ammonia D) enabling the roots to parasitize neighboring plants E) providing sugar to the root cells, which have no chloroplasts of their own (37-24) B
What are epiphytes? A) haustoria used for anchoring to host plants and obtaining xylem sap B) aerial vines common in tropical regions C) plants that live in poor soil & digest insects to obtain nitrogen D) plants that grow on other plants but don't obtain nutrients from their hosts E) plants that have a symbiotic relationship with fungi (37- D
Which of the following is a primary difference between ectomycorrhizae and endomycorrhizae? A) there are no significant differences between them B) endomycorrhizae, but not ectomycorrhizae, form a dense sheath over the surface of the root C)ectomycorrhizae don't penetrate root cells, whereas endomycorrhizae grow into invaginations of the root cell membranes D)ectomycorrhizae are found in woody plant species; about 85% of plant families E)endomycorrhizae have thicker, shorter hyphae (37-2 C
For this pair of items, choose the option that best describes their relationship: (A) the ploidy of the angiosperm seed endosperm (B) the ploidy of the angiosperm seed embryo A) item (A) may stand in more than one of the above relations to item (B) B) item (A) is less than item (B) C) item (A) is greater than item (B) D) item (A) is exactly or very approximately equal to item (B) (38-1) C
Which of the following is true in plants? A) haploid gametophyte-gametes-meiosis-fertilization-diploid sporophyte B) sporophyte-spores-meiosis-gametophyte-gametes C) haploid sporophyte-spores-fertilization-diploid gametophyte D) sporophyte-meiosis-gametophyte-gametes-fertilization-diploid zygote E) sporophyte-mitosis-gametophyte-meiosis-sporophyte (38-2) D
Which of the following is true in plants? A) mitosis occurs in gametophytes to produce gametes B) the gametophyte is within the flower in angiosperms C) meiosis occurs in sporophytes to produce spores D) A and B only E) A,B, and C (38-3) E
Which of the following are true of most angiosperms? A) a triploid endosperm within the seed B) an ovary that becomes a fruit C) a small (reduced) sporophyte D) A and B only E) A,B, and C (38-4) D
Based on studies of plant evolution, which flower part is not a modified leaf? A) carpel B) stamen C) petals D) sepals E) receptacle (38-5) E
All of the following floral parts are directly involved in pollination or fertilization except the: A) receptacle B) carpel C) petals D) sepals E) stamen (38-6) D
Location of the ovary: A) receptacle B) stamen C) sepals D) petals E) carpel (38-7) E
Which of the following is the correct order of floral organs from the outside to the inside of a complete flower? A) spores-gametes-zygote-embryo B) sepals-stamens-petals-carpels C) petals-sepals-stamens-carpels D) male gametophyte-female gametophyte-sepals-petals E) sepals-petals-stamens-carpels (38-8) E
In some angiosperms, other floral parts contribute to what is commonly called the fruit. Which of the following fruits is derived mostly from an enlarged receptacle? A) pineapple B) pea C) raspberry D) apple E) peach (38-9) D
Meiosis occurs within all of the following flower parts except the: A) anther B) style C) ovule D) megasporangium E) ovary (38-10) B
A perfect flower is fertile, but may be either complete or incomplete. Which of the following correctly describes a perfect flower? A) it has both stamens and carpels B) it has no sepals C) it has no endosperm D) it has fused carpels E) it is on a dioecious plant (38-11) A
Carpellate flowers: A) develop into fruits B) are perfect C) produce pollen D) are complete E) are found only on dioecious plants (38-12) A
In flowering plants, pollen is released from the: A) carpel B) anther C) filament D) pollen tube E) stigma (38-13) B
In the life cycle of an angiosperm, which of the following stages is diploid? A) both megaspore and polar nuclei B) microsporocyte C) generative nucleus of a pollen grain D) polar nuclei of the embryo sac E) megaspore (38-14) B
Where does meiosis occur in flowering plants? A) pollen tube B) megasporocyte C) microsporocyte D) endosperm E) megasporocyte and microsporocyte (38-15) E
Which of these is incorrectly paired with its life-cycle generation? A) embryo-sporophyte B) pollen-gametophyte C) anther-gametophyte D) stamen-sporophyte E) embryo sac-gametophyte (38-16) C
In which of the following pairs are the two terms equivalent? A) embryo sac-female gametophyte B) microspore-pollen grain C) endosperm-male gametophyte D) seed-zygote E) ovule-egg (38-17) A
Which of the following would be considered to be a multiple fruit? A) apple B) strawberry C) corn on the cob D) raspberry E) pineapple (38-18) E
Three mitotic divisions within the female gametophyte of the megaspore produce: A) three pollen grains B) three antipodal cells, two polar nuclei, one egg, and two synergids C) a tube nucleus, a generative cell, and a sperm cell D) two antipodal cells, two polar nuclei, two eggs, and two synergids E) the triple fusion nucleus (38 B
What is the difference between pollination and fertilization in flowering plants? A) fertilization precedes pollination B) if fertilization occurs, pollination is unnecessary C) pollen is formed within megasporangia so male and female gametes are close D) poll.-transfer of pollen from an anther to a stigma. Fert.-fusion of haploid nuclei E) poll. easily occurs between plants of difference species, fert. within species (38-20 D
What is the function of the integument of an ovule? A) protect against animal predation B) produce hormones that ensure successful pollination C) ensure double fertilization D) form a seed coat E) direct development of the endosperm (38-21) D
A fruit includes: A) one or more seeds B) the ovary wall C) fleshy cells rich in sugars D) brightly colored pigments to attract animal dispersers E) both A and B (38-22) E
What is the first organ to emerge from a germinating eudicot seed? A) shoot B) radicle C) hypocotyl D) epicotyl E) plumule (38-23) B
Which of the following "vegetables" is botanically a fruit? A) celery B) lettuce C) potato D) green beans E) radish (38-24) D
The embryo of a grass seed is enclosed by two protective sheaths, a(n)______, which covers the young shoot, and a(n)______, which covers the young root. A) hypocotyls;epicotyl B) scutellum;coleoptile C) coleoptile;coleorhiza D) cotyledon;radicle E) epicotyl;radicle (38-25) C
A disadvantage of monoculture is that: A) it predominantly uses vegetative propagation B) most grain crops self-pollinate C) genetic uniformity makes a crop vulnerable to a new pest or disease D) it allows for the cultivation of large areas of land E) the whole crop ripens at one time (38 C
All of the following are commercial uses of transgenic crops except: A) developing plants that produce increasing quantities of Vitamin A B) inserting Bt toxin genes into cotton, maize, and potato C) producing plants that resist attack by certain viruses D) producing paltns that contain genes for making human insulin E) developing plants that tolerate herbicides (38-27) D
The sporophytes of mosses depend on the gametophytes for water and nutrition. In seed plants the reverse is true. From which seed plant sporophyte structure do the unfertilized gametophytes directly gain water and nutrition? A) sporangia B) sporopollenin C) sporophylls D) ovary E) embryos (30-1) A
Created by: hermionepippin