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Botany Exam IV
| Question | Answer |
|---|---|
| Describe zygotic meiosis | Zygote is only diploid cell in the life cycle |
| Which of the following describes sporic meiosis | characteristic of organisms with alternation of phases life cycle |
| The gametophyte | multicellular haploid body which occurs in sporic meiosis |
| Gametic meiosis | occurs when meiosis directly produce haploid gamete |
| The embryo | occurs only when zygote divides by mitosis |
| The structure that is formed directly by the union of two gametes | zygote |
| Statement about reproduction in vascular plants is false | gametophyte is structurally more complex than the sporophyte |
| Heterospory vs. homospory because heterospory involves | gametophytes with endosporic development |
| A trilete mark | A set of three ridges where a spore was closely attached to 3 others |
| Plant spores develop by _______ into a set of four, called a ________ | meiosis, tetrad |
| In contrast to a eusporangium, a leptosporangium | Arises from a single initial cell |
| Innermost wall of a eusporangium that provides nutrients | Tapetum |
| The annulus is most directly involved in | dispersing spores |
| IN plants with extreme heterospory | Microsporangia produce lots of microspores but each megasporangium produces only 1 functional megaspore |
| In plants with homospory | sporangia identical |
| life cycle of salginella | alternation of phases with heterospory |
| The archegonia in salginella | protrude through a rupture in megaspore wall |
| A seed is composed of _____ and _______ | ovule and embryo |
| In seed plants, the ____ is called the nucellus | megasporangium |
| A micropyle is | an opening in the seed coat |
| which is not a step of the evolution of an ovule | production of only 4 mother cells per megasporangium |
| with the evolution of the ovule, the unit of dispersal shifted from the megaspore to the | seed |
| in the pine life cycle, meiosis occurs | microsporocytes and megasporocytes |
| in pines, a megaspore mother cell divides to give rise to four ______ in which _____ disintegrate | megaspores, three |
| IN a pine seed, the 3 generations are represented by | seed coat, embryo and food supply |
| The pedicle of a flower is | stalk of a flower with an inflorescence |
| recepticle | part of stalk to which flower parts are attached |
| fertile parts of the flowers | carpals and stamens |
| which of the following statements about a stamen is false | it is part of the gynecium |
| The gynecium consists of all the _____ of a flower | carpels |
| portion of carpel that enclose the ovules | ovary |
| Style connects the _____ to the _____ | ovary, stigma |
| In axile placentation, ovules are born | on a central column of a partitioned overy |
| A perfect flower contains | carpels and stamens |
| Only stamens and petals | incomplete and imperfect |
| Flowers that have bilateral symmetry | irregular |
| in angiosperms, ovary develops into a | fruit |
| sporopollenin is primary constituent of | wals of homosporous spores, microspores, and pollen grains |
| In the process of double fertilization _________, one sperm fuses with ______ and another fuses with | egg, polar nuclei |
| in most angiosperms the primary endosperm nucleus (the first cell) is | 3N |
| The function of the endosperm is to provide ______ for the embryo | food |
| Unlike gymnosperms, stored food in angiosperms is | formed after fertilization occurs |
| All plant hormones | elicit physiological rxns |
| ____ have recently been ranked among the classic 5 hormones | brassinosteroids |
| Which hormone is phenolic, similar to aspirin | salicylic acid |
| Insect bites initiate ________ which initiate __________ | systemin, jasmonic acid |
| Darwin and Darwin JR observed that if a shoot tip is covered, the shoot | will not bend |
| In stems, polar auxin transport occurs in the | xylem parenchyma cells |
| A PIN Protein | Efflux of auxin |
| In apical dominance, the presence of an apical bud | inhibits growth of lateral (axillary) buds |
| Which about fruit is false | parthenocarpic fruits lack ovules |
| Which of the following about 2,4-D is false | Kills grasses more readily than broadleaf plants |
| Observation that ____ stimulated tissue cells led to discovery of cytokinins | Coconut milk |
| High auxin than kinetin, ____ are formed | roots |
| Cytokines synthesized in the | roots |
| Ethylene, causes _____ longitudinal growth, ______ radial growth and _____directional growth | Decreased, increased, horizontal |
| About ABA is false | inhibits seed production proteins |
| Dwarf plants | can't synthesize gibberellins |
| ______ releases giberellins which diffuse to | embryo, aleuronic acid |
| cell expansion increased by ______, decreased by ______ | Auxin and GA, ABA and ethylene |
| Ethylene receptor located in | ER Membrane |
Created by:
tback1992
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