Plant Growth And Development Multiple Choice Question and Answers

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Plant Growth And Development Multiple Choice Questions

Question 1. Fruit and leaf drop at early stages can be prevented by the application of

  1. Ethylene
  2. Auxins
  3. Gibberellic acid
  4. Cytokinins

Answer: 2. Auxins

Question 2. Asymptote in a logistic growth curve is obtained when—

  1. K = N
  2. K> N
  3. K< N
  4. The value of ‘r’ approaches zero

Answer: 1. K = N

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Question 3. The Avena curvature is used for bioassay of—

  1. GA3
  2. IAA
  3. Ethylene
  4. ABA

Answer: 2. IAA

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Question 4. You are given a tissue with its potential for differentiation in an artificial culture. Which of the following pairs of hormones would you add to the medium to secure shoots as well as roots?

  1. IAA and gibberellin
  2. Auxin and cytokinin
  3. Auxin and abscisic acid
  4. Gibberellin and abscisic acid

Answer: 2. Auxin and cytokinin

Question 5. Phytochrome is a—

  1. Flavoprotein
  2. Rotein
  3. Lipoprotein
  4. Chromoprotein

Answer: 4. Chromoprotein

Plant Growth And Development Multiple Choice Question and Answers

Question 6. Auxin can be bioassayed by—

  1. Lettuce hypocotyl elongation
  2. Avena coleoptile curvature
  3. Hydroponics
  4. Potometer

Answer: 2. Avena coleoptile curvature

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Question 7. Which one of the following fruits is parthenocarpic?

  1. Banana
  2. Brinjal
  3. Apple
  4. Jackfruit

Answer: 1. Banana

Question 8. Dr. F. Went noted that if coleoptile tips were removed and placed on agar for one hour, the agar would produce a bending when placed on one side of freshly cut coleoptile stumps. Of what significance is this experiment?

  1. It made possible the isolation and exact identification of auxin
  2. It is the basis for the quantitative determination of small amounts of growth-promoting substances
  3. It supports the hypothesis that IAA is auxin
  4. It demonstrated the polar movement of auxins

Answer: 4. It demonstrated the polar movement of auxins

Question 9. Which one of the following growth regulators is known as the ‘stress hormone’?

  1. Abscisic acid
  2. Ethylene
  3. GA3
  4. Indole acetic acid

Answer: 1. Abscisic acid

Question 10. Match the following columns

Plant Growth And Development multipule choice Question 10

  1. 1-2, 2-4, 3-3, 4-1
  2. 1-3, 2-1, 3-4, 4-2
  3. 1-1, 2-2, 3-4, 4-3
  4. 1-2, 2-4, 3-1, 4-3

Answer: 2. 1-3, 2-1, 3-4, 4-2

Question 11. Which one of the following is a growth regulator produced by plants?

  1. Naphthalene acetic acid
  2. Zeatin
  3. 2, 4-dichloro phenoxy acetic acid
  4. Benzyl aminopurine

Answer: 2. Zeatin

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Question 12. Which of the following plant growth hormones increases the yields of sugar by increasing the length of the stem in sugarcane?

  1. Cytokinin
  2. Auxin
  3. Abscisic acid
  4. Ethylene
  5. Gibberellic acid

Answer: 5. Gibberellic acid

Question 13. One hormone hastens the maturity period in juvenile conifers, a second hormone controls xylem differentiation while, the third increases the tolerance of plants to various stresses and they are respectively—

  1. Auxin, gibberellin, and cytokinin
  2. Gibberellin, auxin, and cytokinin
  3. Gibberellin, auxin, and ethylene
  4. Gibberellin, auxin, and ABA
  5. Auxin, gibberellin, and ABA

Answer: 4. Auxin, gibberellin, and ABA

Question 14. Which of the following is not an effect of ethylene?

  1. Promotes senescence and abscission of plant organs
  2. Breaks seed and bud dormancy
  3. Brings about horizontal growth of seedlings
  4. Hastens fruit ripening
  5. Helps to overcome apical dominance

Answer: 5. Helps to overcome apical dominance

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Question 15. Auxin was first isolated from—

  1. Fungus
  2. Apple
  3. Sperm DNA
  4. Human urine

Answer: 4. Human urine

Question 16. Apical dominance in plants means—

  1. Growth of lateral buds
  2. Inhibition of the growth of lateral buds
  3. Both A and B
  4. None of the above

Answer: 2. Inhibition of the growth of lateral buds

Question 17. Vernalization is dependent on exposure to—

  1. Low temperature
  2. High temperature
  3. Both A and BNOA
  4. None of these

Answer: 1. Low temperature

Question 18. In flowering plants, the site of perception of light/dark duration is—

  1. Stem
  2. Leaves
  3. Shoot apex
  4. Floral meristem

Answer: 2. Leaves

Question 19. Study the following columns

Plant Growth And Development multipule choice Question 19

  1. 1-3, 2-1, 3-5, 4-2
  2. 1-2, 2-5, 3-4, 4-3
  3. 1-2, 2-1, 3-5, 4-4
  4. 1-4, 2-3, 3-2, 4-1

Answer: 2. 1-2, 2-5, 3-4, 4-3

“important MCQs on plant growth and development”

Question 20. Senescence in plants leads to cells.

  1. Increase in number
  2. Increase in size
  3. Death
  4. Differentiation

Answer: 3. Death

“objective questions on plant growth and development”

Question 21. If a plant produces flowers when exposed only to alternating periods of 5 hours of light and 3 hours of dark in a 24-hour cycle, then the plant should be.

  1. Short-Question day plant
  2. Long-day plant
  3. Short-long day plant
  4. Day-neutral plant

Answer: 2. Long-day plant

Question 22. Hormone replacing the requirement of vernalization is

  1. Ethylene
  2. Gibberellins
  3. Auxin
  4. Cytokinin

Answer: 3. Auxin

Question 23. Monocarpic plants are those in which—

  1. Flowering and fruiting occur only once
  2. Flowering and fruiting occur regularly
  3. Produce fruits with a single-seed
  4. Fruits are produced without fertilization

Answer: 1. Flowering and fruiting occur only once

“plant growth and development class 11 MCQ”

Question 24. During seed germination, its stored food is mobilized

  1. Ethylene
  2. Cytokinin
  3. ABA
  4. Gibberellin

Answer: 4. Gibberellin

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