NCERT Class 11 Chapter 15 Biology Plant Growth and Development MCQ

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1. Which one is a long day plant?

A. Spinach

B. Mirabilis jalapa

C. Tobacco

D. Glycine max

2. The hormone which controls cell division and cell differentiation is

A. cytokinin

B. auxin

C. ABA

D. gibberellin

3. Which one of the following is a long day plant?

A. Wheat

B. Soyabean

C. Bajra

D. Tobacco

4. A chemical believed to be involved in flowering is

A. florigen

B. gibberellin

C. kinetin

D. IBA

5. Differentiation of shoot is controlled by

A. high cytokinin : auxin ratio

B. high gibberellin : auxin ratio

C. high auxin : cytokinin ratio

D. None of these

6. Which one of the following generally acts as an antagonist to gibberellins?

A. ABA

B. Zeatin

C. Ethylene

D. IAA

7. To avoid excessive water loss during severe drought stress,the closure of stomata is signalled by the production of

A. ABA

B. IAA

C. NAA

D. IBA

8. In short day plants, flowering is induced by

A. photoperiod below a critical length and uninterrupted long night.

B. long night

C. short photoperiod and interrupted long night.

D. photoperiod less than 12 hours

9. Apical dominance in plants is caused by

A. high concentration of auxins in the terminal bud

B. high concentration of gibberellins in the apical bud

C. high concentration of auxins in the lateral bud

D. absence of auxins and gibberellins in apical bud

10. Primary precursor of IAA is

A. tryptophan

B. phenylalanine

C. tyrosine

D. leucine

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11. Parthenocarpic fruit can be produced by the application of which of the following auxin?

A. All of the above

B. 2, 4-D (2-4 dichloro phenoxy acetic acid)

C. IAA (Indole acetic acid)

D. IBA (Indole butyric acid)

12. The conditions necessary for vernalization are

A. water and carbon dioxide

B. oxygen and water.

C. low temperature and oxygen

D. high temperature and water

13. Which of the following hormones does not naturally occur in plants?

A. 2,4–D (2, 4–dichloro pheoxy acetic acid)

B. IAA

C. ABA

D. GA

14. Which of the following types of phytohormones resemble the nucleic acids in some structural aspects ?

A. Cytokinin

B. ABA

C. Auxin

D. Gibberellin

15. Which one of the following statements regarding auxin is/ are correct?

A. IAA and IBA are natural but NAA, 2, 4-D and 2, 4, 5-T are synthetic auxins

B. IAA and NAA are natural but IBA, 2, 4, 5-T and 2, 4-D are synthetic auxins

C. NAA and 2, 4, 5-T are natural but IAA, IBA and 2, 4-D are synthetic auxins

D. IAA, NAA, IBA, 2, 4-D and 2, 4, 5-T are synthetic auxins.

16. Which one among the following chemicals is used for causing defoliation of forest trees?

A. 2, 4-dichloro phenoxy acetic acid

B. Malic hydrazide

C. Phosphon-D

D. None of these

17. A plant completing its life cycle before the onset of dry condition is said to be

A. drought escaping

B. short day plant

C. long day plant

D. All of these

18. Phytohormones are

A. regulators synthesized by plants and influencing physiological processes.

B. hormones regulate growth from seed to adulthood.

C. chemicals regulating secondary growth.

D. chemicals regulating flowering.

19. Which one of the following is a natural growth inhibitor?

A. ABA

B. GA

C. NAA

D. IAA

20. In a plant growing under dark condition, the leaves turn light coloured, internodes become much elongated and it is termed as

A. etiolation

B. chlorosis

C. vernalization

D. phyllotaxy

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21. Leaf fall can be prevented with the help of

A. abscisic acid

B. auxins

C. florigen

D. cytokinins

22. Which of the following hormones can replace vernalization?

A. Auxin

B. Cytokinin

C. Gibberellins

D. Ethylene

23. Mowing grass lawn facilitates better maintenance because

A. wounding stimulates regeneration

B. removal of apical dominance and stimulation of intercalary meristem

C. removal of apical dominance

D. removal of apical dominance and promotion of lateral meristem

24. Highest auxin concentration occurs

A. in growing tips

B. in leaves

C. at base of plant organs

D. in xylem and phloem

25. Phytohormones are

A. chemicals regulating flowering

B. chemicals regulating secondary growth

C. hormones regulating growth from seed to adulthood

D. regulators synthesized by plants and influencing physiological processes