Biology

Plant Growth and Hormones

695 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

The ripening of fruits can be accelerated by which of the following methods?

  1. Reducing water supply to the plant during fruit development

  2. Artificial exposure of developing fruits to ethylene

  3. Supplying abundant nitrogen to the atmosphere surrounding them

  4. Warming up the surroundings artificially

  5. Cooling up the surroundings artificially
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The ripening of fruits can be accelerated by artificial exposure of developing fruits to ethylene.

Multiple choice

Gibberellins do not _________.

  1. substitute cold treatment

  2. promote blotting in rosette plant

  3. inhibit flowering in long day plants

  4. cause elongation of dwarf plants

  5. None of these
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Gibberellins do not inhibit flowering in long day plants.

Multiple choice

Which of the following sets represents cytokinins only?

  1. IAA, IBA, NAA

  2. Kinetin, Zeatin, BAP

  3. Kinetin, IAA, IBA

  4. Kinetin, Zeatin, IBA

  5. Zeatin, NAA, IBA
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Kinetin is a type of cytokinin, a class of plant hormone that promotes cell division. Zeatin is a plant hormone derived from the purine adenine. It is a member of the plant growth hormone family known as cytokinins. 6-Benzylaminopurine (BAP) is a first-generation synthetic cytokinin that elicits plant growth and development responses, setting blossoms and stimulating fruit richness by stimulating cell division. 

Multiple choice

Match Column - I with Column – II and choose the correct option.

 
Column – I
Column – II
A. Gibberellins 1. Stimulate embryo or shoot development
B. Cytokinins 2. Promote cell division
C. Auxins 3. Cause plant cells to grow

  1. A - 1, B - 2, C - 3

  2. A - 1, B - 3, C - 2

  3. A - 2, B - 1, C - 3

  4. A - 2, B - 3, C - 1

  5. A - 3, B - 2, C - 1
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Gibberellins are used to stimulate embryo or shoot development. Cytokinins are growth regulators which promote cell division. Auxins are the growth regulators that cause plant cells to grow.