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biology test 3

chapter 29

If you took a species of plant that normally grows on the forest floor and began to grow it in full sunlight, over generations, you may expect the plant's progeny to: grow mostly sun leaves.
Atmospheric levels of carbon dioxide have rapidly increased since the industrial revolution. Although bad for global warming, one positive outcome of this increase is that: some crops such as tomatoes and cucumbers may experience enhanced growth rates.
. A plant's ability to absorb carbon dioxide is reduced when: stomata are closed
When scientists are attempting to breed for increased ability of a plant to utilize carbon dioxide they must consider improvement of: bundle-sheath cells.
Chlorosis in plants is a condition best explained by: lack of certain minerals.
Water typically makes up about what percentage of a plant? 90%
. Macronutrients are defined as those elements: required in relatively large amounts.
Which one of the following is NOT considered to be one of the macronutrients needed by plants? manganese
Leaching is most likely to affect the nutrients plants need in which soil horizon? Topsoil
Potassium deficiency in plants is most common on light, sandy soils. This is likely because: percolation of water through sandy soils leaches potassium from the soil.
Which activity may be helpful in reducing dependency on inorganic fertilizers? Composting
Which of the following is the best answer for why plants require nitrogen? To make amino acids and nucleotides
It is possible to manufacture a form of nitrogen that is useable by plants; however, the major drawback to this process is: cost of converting nitrogen to a useable form.
One of the ways agricultural production of such fruits as tomatoes or cucumbers can be increased significantly is to grow them in: greenhouses supplied with extra carbon dioxide.
Which of the following produce organic acids that may contribute to weathering of rocks? Lichens
When certain bodies of water develop regions known as "dead zones" it often means that: oxygen has been depleted.
You are part of a team that discovers a new nitrogen-fixing bacteria in symbiosis with a plant. As you study this new bacteria, you discover that it is photosynthetic. This bacteria is likely to be: cyanobacteria.
Based on the fact that CO2 is often limiting for photosynthesis, what might you conclude about the evolution of photosynthesis? Photosynthesis evolved when environmental concentrations of CO2 were high.
You find a sick plant in an arid environment. After studying it, you believe it is specifically defective in C4 photosynthesis. What nutrient might this plant be lacking? Sodium
Measurement of relative water content (RWC) can be used to predict a plant's: ability to recover from the wilted condition.
. A turgid plant cell is one that: . has excess water in its cytosol.
Which of the following is not a factor used directly in determining water potential of plant cells? Temperature
Active transport occurs ________ the concentration gradient across a cell membrane. against
Channels in membranes are best described as: open spaces.
Which of the following is NOT required for passive transport? Energy
Which one of the following is the best explanation for why plants may use active rather than passive transport? Solute concentration is a factor.
Cellular items that can NOT be transported through proton channels are: mitochondria.
Which one of the following features of plant cells is NOT common with animal cells? Turgor pressure
Which of the following is NOT part of the pathway that water and dissolved minerals (i.e., Fe, K, Mg, etc.) follow as they move from the soil into a plant to the xylem? Through phloem
. Which of the following is the proper order of cells for water and minerals to travel from the soil into the xylem? . Root hair, cortex, endodermis, xylem
Apoplastic movement of water and minerals is possible until they reach which cell type? Endodermis
Which cells in the root have a suberin layer called the Casparian strip? Endodermis
One feature that phloem cells have that xylem cells lack is: cytosol
. In phloem, bulk flow occurs from regions of high to low ________ concentration. solute
. Which of the following are the water conducting cells of the xylem? Vessels and tracheids
The cohesion-tension theory explains the role of ________ in long-distance water transport. transpiration
Transpiration water loss occurs mostly through which of the following structures? Stomata
When guard cells are ________ a stomatal pore opens between them. turgid
Which of the following would you expect to be happening if a plant is showing water stress? Abscisic acid is being transported to the guard cells.
Which of the following is the advantage that plants in arid habitats experience when they keep their stoma closed during hot daytime hours? It helps to conserve water.
Which of the following plant hormones stimulates development of an abscission zone in the leaf petiole? ethylene
Mutant plants that wilt easily under strong sunlight and high temperatures have been isolated. The stomata in these plants are functional, but do not respond to ABA. What protein may be missing from these plants? ABA receptor
One difference between sieve-tube cells and vessels is that sieve-tube cells are _______, but vessels are dead. alive
Bulk flow in the phloem tissue is mostly downward whereas bulk flow in xylem is mostly: upward.
You want to calculate the relative water content of a sapling. You measure the fresh weight to be 11.95g, the turgid weight to be 12.5g, and the dry weight to be 11.5g. What is the RWC of this plant, and is it likely to live or die? 45%; die
Arabidopsis plants that have mutant AtSUC2 alleles accumulate sugar and starch in their mature leaves. What process might these plants be unable to carry out? Phloem loading
Most plants absorb water and minerals from the _______ and transport them through the _______. soil; xylem
What will happen if you place a turgid cell in a hypertonic solution? A hypotonic solution? It will lose water; nothing
. FITC-boronic acid is a dye that stains cell walls and intracellular spaces. This dye is probably transported via: apoplastic transport.
Why is it particularly important for the endodermis to block transport in the specific location where it does? to control access of transported materials to the plant vascular tissues, which can carry materials throughout the plant.
Arabidopsis irx4 mutants have a collapsed xylem phenotype. What process is likely to be defective in these mutants? Deposit of lignin
When SEO gene expression is inactivated in tobacco plants, injured mutant plants exude nine times more sugar than injured wild type plants. What do SEO genes encode? P proteins
What hormone plays a role in the closing of stomata in response to water stress? Abscisic acid
How do you think global warming is affecting leaf abscission? Leaf abscission is happening later in the fall.
In tobacco plants, a H+/sugar cotransporter called NtSUT1 is required for sucrose loading into phloem. Levels of NtSUT1 are likely to be highest in what plant tissue? Leaves
Which cells are likely to have a higher cellular water potential? Sieve-tube elements near sink tissues
Created by: Susyam



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