Nutrition and Transport in Vascular Plants MCQs

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Arrange the following tissues, organs, chemicals, and flows in the correct cyclical steps in the bulk flow of phloem sap.

i. sieve tube
ii. xylem vessel
iii. sucrose in leaf (source)
iv. sucrose in root (sink)
v. bulk flow by negative pressure
vi. bulk flow by positive pressure
  • A. iii, i, vi, iv, ii, v
  • B. i, ii, iii, iv, v, vi
  • C. ii, i, iii, v, iv, vi
  • D. iii, ii, i, v, iv, iv
  • Correct Answer: Option A

A young farmer purchases some land in a relatively arid area and is interested in earning a reasonable profit for many years. Which of the following strategies would best allow the farmer to achieve such a goal?

  • A. establishing an extensive irrigation system
  • B. using plenty of the best fertilizers
  • C. finding a way to sell all parts of crop plants
  • D. selecting crops adapted to arid areas
  • Correct Answer: Option D

You are most likely to see guttation in small plants when the

  • A. transpiration rates are high.
  • B. root pressure exceeds transpiration pull.
  • C. preceding evening was hot, windy, and dry.
  • D. water potential in the stele of the root is high.
  • Correct Answer: Option B

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; lower leaf area index
  • C. short plants; lower leaf area index
  • D. bushier plants; higher leaf area indexes
  • Correct Answer: Option D

According to the pressure flow hypothesis of phloem transport,

  • A. solute moves from a high concentration in the source to a lower concentration in the sink.
  • B. water is actively transported into the source region of the phloem to create the turgor pressure needed.
  • C. the combination of a high turgor pressure in the source and transpiration water loss from the sink moves solutes through phloem conduits.
  • D. the formation of starch from sugar in the sink increases the osmotic concentration.
  • Correct Answer: Option A

The dominant chemical in phloem sap is (are)

  • A. sucrose.
  • B. hormones
  • C. minerals
  • D. amino acids.
  • Correct Answer: Option A

Phloem sap flows through

  • A. tracheids.
  • B. vessels
  • C. sieve tubes.
  • D. ground tissue.
  • Correct Answer: Option C

Which of the following is an adaptation in xerophytes?

  • A. high density of stomata in a unit area of the leaf
  • B. succulent stems with thick cuticle
  • C. stems modified as spines
  • D. lack of thick cuticle
  • Correct Answer: Option B

Which of the following elemental ions plays a critical role in opening and closing of stomata?

  • A. nitrogen
  • B. potassium
  • C. magnesium
  • D. calcium
  • Correct Answer: Option B

As a biologist, it is your job to look for plants that have evolved structures with a selective advantage in dry, hot conditions. Which of the following adaptations would be least likely to meet your objective?

  • A. CAM plants that grow rapidly
  • B. small, thick leaves with stomata on the lower surface
  • C. a thick cuticle on fleshy leaves
  • D. plants that do not produce abscisic acid and have a short, thick taproot
  • Correct Answer: Option D