Biology

Plant Growth and Hormones

727 Questions

Plant growth and hormones is a vital topic in biology that covers the physiological effects of different plant regulators like auxins, gibberellins, and cytokinins. These concepts are frequently tested in various general science sections of competitive exams. Practicing these questions helps clarify complex mechanisms like vernalisation, senescence, and tropism for test takers.

Abscisic acid effectsCytokinin functionsAuxins and tropismPlant tissue cultureSenescence in plantsNatural plant hormones

Plant Growth and Hormones Questions

Multiple choice

Which hormone is primarily responsible for fruit development?

  1. Auxin

  2. Gibberellin

  3. Cytokinin

  4. Ethylene
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Ethylene is the primary hormone involved in fruit development, promoting ripening and softening of fruits.

Multiple choice

The process of cellular differentiation during plant development is regulated by:

  1. Transcription Factors

  2. Hormones

  3. Environmental Signals

  4. All of the above
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Cellular differentiation in plants is regulated by a combination of transcription factors, hormones, and environmental signals.

Multiple choice

Which hormone is involved in the regulation of leaf senescence?

  1. Auxin

  2. Gibberellin

  3. Cytokinin

  4. Abscisic Acid
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Abscisic Acid (ABA) is the primary hormone involved in the regulation of leaf senescence, promoting the breakdown of chlorophyll and the reabsorption of nutrients from leaves.

Multiple choice

Which hormone is primarily responsible for the regulation of flowering?

  1. Auxin

  2. Gibberellin

  3. Cytokinin

  4. Florigen
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Florigen is the primary hormone that regulates flowering in plants, promoting the transition from vegetative growth to reproductive growth.

Multiple choice

Which hormone is primarily responsible for the regulation of fruit ripening?

  1. Auxin

  2. Gibberellin

  3. Cytokinin

  4. Ethylene
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Ethylene is the primary hormone involved in the regulation of fruit ripening, promoting the breakdown of cell walls and the accumulation of sugars and pigments.

Multiple choice

Which hormone is primarily responsible for the regulation of root growth?

  1. Auxin

  2. Gibberellin

  3. Cytokinin

  4. Abscisic Acid
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Auxin is the primary hormone involved in the regulation of root growth, promoting the elongation and differentiation of root cells.

Multiple choice

Which of the following is a common type of growth regulator used in local agriculture?

  1. Gibberellins

  2. Auxins

  3. Cytokinins

  4. Abscisic acid
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Gibberellins are a type of growth regulator that promote plant growth and development. They are used in local agriculture to increase crop yield and improve plant quality.