Tag: plant growth

Quizzes (10) Questions (270)

Questions Related to plant growth

Multiple choice biology plant growth other plant hormones cytokinins, ethylene and abscisic acid plant hormones

Which of the following is both a growth promoter as well as a growth inhibitor?

  1. Auxin

  2. Gibberellins acid

  3. ABA

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

Ethylene is considered as the growth hormone which regulates promoter and inhibitor as it is used to make the fruit ripen, breaks bud dormancy, initiates flowering. It acts as inhibitor as it retards the mitotic division in root and shoot meristem and also for axillary buds.

So the correct option is 'Ethylene'.

Multiple choice biology plant growth other plant hormones cytokinins, ethylene and abscisic acid plant hormones

Choose the correct answer from the alternatives given.
Closing of stomata are induced by:

  1. axing

  2. boxing

  3. abscise acid

  4. indole 3-acetic acid
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

ABA inhibits seed germination. ABA stimulates the closure of stomata in the epidermis and increases the tolerance of plants to various kinds of stresses.

So, the correct option is 'abscisic acid'. 

Multiple choice biology plant growth other plant hormones cytokinins, ethylene and abscisic acid plant hormones

Physiological function not affected by ABA is

  1. Abscission

  2. Senescence

  3. Dormancy

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

Abscisic acid (ABA) is known to promote abscission, senescence, and dormancy. It generally inhibits growth processes, but its role in flowering is complex and often considered less direct or inhibitory compared to its other primary functions.

Multiple choice biology plant growth other plant hormones cytokinins, ethylene and abscisic acid plant hormones

Hormone responsible for ageing is ____________.

  1. GA

  2. IAA

  3. Ethylene

  4. Cytokinin
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The plant hormone ethylene is growth inhibitor and is released in plant organs that are to undergo ripening or senescence. Ethylene triggers climacteric ripening of the fruit and induces insensitivity of senescent organs to auxins due to which the nutrients are channelized to other growing parts of the plant resulting in withering away of the plant part.

So, the correct answer is 'Ethylene'

Multiple choice biology plant growth other plant hormones cytokinins, ethylene and abscisic acid plant hormones

Select the mismatched pair.

  1. Gibberellic acid - Increases yield of sugarcane

  2. Cytokinin - Promotes apical dominance

  3. Ethylene - Sprouting of potato tuber

  4. Abscisic acid - Inhibits seed germination
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Gibberellic acid increases the yield of sugarcane crop. Cytokinins inhibit apical dominance and act antagonistically to auxins which promote apical dominance. Rhizomes, corms, tubers, seeds (e.g., peanut) and other storage organs can be made to sprout early by exposing them to ethylene. Abscisic acid is a plant growth inhibitor, which inhibits seed germination.

Multiple choice biology plant growth other plant hormones cytokinins, ethylene and abscisic acid plant hormones

The affect of apical dominance can be overcome by which of the following hormone?

  1. IAA

  2. Ethylene

  3. Gibberellin

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

Presence of cytokinin in an area causes preferential movement of nutrients towards it. When applied to lateral buds, they help in their growth despite the presence of apical bud. They thus act antagonistically to auxin which promotes apical dominance. Therefore cytokinin can overcome apical dominance, caused by auxins.

Multiple choice biology plant growth other plant hormones cytokinins, ethylene and abscisic acid plant hormones

Induction of cell division activity and delay in senescence is caused by ______________.

  1. gibberellin

  2. auxin

  3. cytokinin

  4. ethylene.
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The most important function of cytokinins is the promotion of cell division. The varying amounts of cytokinins, along with sufficient auxins is required for the growth of callus in tissue culture experiments. Cytokinins delay the senescence of leaves and other organs by mobilisation of nutrients. It is known as Richmond-Lang effect.

Multiple choice biology plant growth other plant hormones cytokinins, ethylene and abscisic acid plant hormones

The phenomenon of apical dominance can be overcome by exogenous application of ___________.

  1. auxins

  2. gibberellins

  3. cytokinins

  4. ethylene.
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Presence of cytokinin in an area causes preferential movement of nutrients towards it. When applied to lateral buds, they help in their growth despite the presence of apical bud. They thus act antagonistically to auxin which promotes apical dominance. Therefore, cytokinin can overcome apical dominance, caused by auxins.

Multiple choice biology plant growth other plant hormones cytokinins, ethylene and abscisic acid plant hormones

The hormone 'X' does the following functions.
(i) Induces seed dormancy.
(ii) Inhibits seed germination.
(iii) Prepares plants to cope with stress.
(iv) Stimulates closure of stomata.
The hormone 'X' should be

  1. ABA

  2. Ethylene

  3. GA

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

ABA induces seed dormancy in unfavorable environmental condition, its function is antagonistic to gibberillin which promotes seed germination. It is regarded as the stress hormone as it brings about closure of stomata during water stress to prevent water loss from transpiration.

So, the correct answer is ' ABA'

Multiple choice biology plant growth other plant hormones cytokinins, ethylene and abscisic acid plant hormones

Coconut water contains __________.

  1. ABA

  2. auxin

  3. cytokinin

  4. gibberellin
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Cytokinins (Letham, 1963) are plant growth hormones which are basic in nature, either aminopurine or phenyl urea derivatives, That promote cytokinesis (= cell division) either alone or in conjunction with auxin. Coconut milk is a rich source of cytokinin.