Plant Physiology – Plant Growth & Development Quiz - ICSE Class 11 Biology

Free practice quiz: Plant Physiology – Plant Growth & Development (ICSE Class 11 Biology). 46 multiple-choice questions with answers and explanations. Play online, no sign-up needed.

Sample questions

1. Which phytohormone is primarily responsible for promoting cell elongation and division in the apical meristems and is also involved in phototropism and gravitropism?

   1. Abscisic acid (ABA)
   2. Ethylene
   3. Gibberellin (GA)
   4. Auxin
   Show answer

   Answer: D. Auxin

   Auxin is the primary plant hormone that stimulates cell elongation and division, especially in the shoot apex and root apex. It plays a crucial role in tropisms by mediating differential growth in response to light and gravity.

2. If a plant exhibits increased root growth and delayed leaf senescence upon application of a growth regulator, which hormone is likely responsible?

   1. Ethylene
   2. Abscisic acid
   3. Cytokinin
   4. Gibberellin
   Show answer

   Answer: C. Cytokinin

   Cytokinins are known to promote cell division, influence root and shoot growth ratios, and delay senescence.

3. The process of fruit ripening is significantly accelerated by:

   1. Abscisic acid
   2. Cytokinin
   3. Ethylene
   4. Auxin
   Show answer

   Answer: C. Ethylene

   Ethylene is a gaseous plant hormone that plays a central role in fruit ripening, senescence, and abscission. It triggers a cascade of biochemical changes that lead to softening, color change, and aroma development.

4. The formation of adventitious roots on stem cuttings, a process widely used in vegetative propagation, can be stimulated by applying:

   1. Abscisic acid
   2. Cytokinin
   3. Gibberellin
   4. Auxin
   Show answer

   Answer: D. Auxin

   Auxins, especially IBA (Indole-3-butyric acid) and NAA (Naphthaleneacetic acid), are commonly applied to stem cuttings to promote the formation of adventitious roots, enhancing their survival and establishment.

5. Which of the following hormones is primarily involved in maintaining the turgor pressure of cells and thus plays a role in cell expansion?

   1. Ethylene
   2. Abscisic acid
   3. Gibberellin
   4. Cytokinin
   Show answer

   Answer: C. Gibberellin

   Gibberellins promote cell elongation by stimulating cell division and increasing cell wall extensibility, which is dependent on turgor pressure.

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