Plant Growth Regulators Practice Questions
20 free Plant Growth Regulators practice questions for the NCERT Biology, each with the correct answer and a detailed explanation. Open any question below, or take the full set as an interactive quiz.
Questions
20 questions
All Plant Growth Regulators questions
- Q1. The term 'Auxin' was first isolated from which of the following sources?
- Q2. Which of the following plant growth regulators is responsible for the 'bakanae' (foolish seedling) disease in rice?
- Q3. F.W. Went demonstrated the presence of auxins by performing experiments on the coleoptile tips of:
- Q4. Which specific combination of hormones is often used in tissue culture to induce shoot and root differentiation?
- Q5. Apical dominance, the phenomenon where the apical bud inhibits the growth of lateral buds, is primarily caused by:
- Q6. Which plant growth regulator is used to speed up the malting process in the brewing industry?
- Q7. Which hormone is a gaseous plant growth regulator?
- Q8. What is the primary effect of Abscisic acid (ABA) on stomata during water stress?
- Q9. The 'triple response' in seedlings (shortening of the axis, thickening of the axis, and horizontal growth) is a characteristic effect of:
- Q10. Which synthetic auxin is widely used as a weedicide to kill broad-leaved dicotyledonous weeds?
- Q11. Bolting, the internode elongation just prior to flowering in rosette plants like beet and cabbage, is induced by:
- Q12. Kinetin, a modified form of adenine, was first discovered from:
- Q13. Which hormone is used to induce parthenocarpy (seedless fruit formation) in tomatoes?
- Q14. The respiratory climacteric, an increase in respiration rate during fruit ripening, is triggered by:
- Q15. Which hormone acts as a general plant growth inhibitor and antagonist to Gibberellins?
- Q16. Cytokinins are primarily synthesized in regions where:
- Q17. Ethephon, the most widely used source of ethylene, is primarily used to:
- Q18. Which of the following hormones helps to overcome apical dominance?
- Q19. Spraying sugarcane crops with which hormone can increase the yield by as much as 20 tonnes per acre?
- Q20. The physiological effect of 'Thinning' in cotton, cherry, and walnut is achieved using: