Free Forms and Functions of Plants MCQs with Answers

11. An enzyme that can stimulate the germination of barley seeds is:

• A. Invertase
• B. Amylase
• C. Lipase
• D. Protease

Explanation: Amylase breaks starch → maltose/glucose → energy for germination.

12. How does pruning help in making the hedge dense?

• A. Releases wound hormones
• B. Induces differentiation of new shoots
• C. Frees axillary buds from apical dominance
• D. Apical shoot grows faster

Explanation: Removes apical bud → axillary buds grow → hedge dense.

13. The ability of the Venus flytrap to capture insects is due to:

• A. Specialized muscle-like cells
• B. Chemical stimulation by prey
• C. Passive process
• D. Rapid turgor pressure changes

Explanation: Sudden turgor loss in specialized cells closes trap rapidly.

14. Differentiation of shoot is controlled by:

• A. High Auxin:Cytokinin Ratio
• B. High Cytokinin:Auxin Ratio
• C. High Gibberellin:Auxin Ratio
• D. High Gibberellin:Cytokinin Ratio

Explanation: High cytokinin-to-auxin ratio → shoot formation; high auxin → root formation.

15. Seed dormancy is due to the :

• A. Ethylene
• B. Abscisic Acid
• C. IAA
• D. Starch

Explanation: .ABA induces dormancy and prevents premature germination.

16. Dwarfness can be controlled by treating the plant with:

• A. Cytokinin
• B. Gibberellic Acid
• C. Auxin
• D. Antigibberellin

Explanation: GA stimulates stem elongation, flowering, and fruit development.

17. Abscisic acid controls:

• A. Cell Division
• B. Leaf Fall and Dormancy
• C. Shoot Elongation
• D. Cell Elongation and Wall Formation

Explanation: ABA induces leaf abscission & seed dormancy under stress.

18. Phototropic and geotropic movements are linked to:

• A. Gibberellins
• B. Enzymes
• C. Auxin
• D. Cytokinins

Explanation: Auxin distribution controls shoot bending toward light and root growth.

19. Which of the following movements is not related to auxin level?

• A. Bending of shoot towards light
• B. Movement of root towards soil
• C. Nyctinastic leaf movements
• D. Movement of sunflower head tracking the sun

Explanation: Nyctinasty is turgor-based, circadian-regulated, not auxin controlled.

20. Which of the following hormones can replace vernalisation?

• A. Auxin
• B. Cytokinin
• C. Gibberellins
• D. Ethylene

Explanation: GA induces flowering without cold treatment.