Tag: plant hormones

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Questions Related to plant hormones

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

Which of the following plant hormones reduces transpiration rate by inducing stomatal closure

  1. Ethylene

  2. Gibberellin

  3. ABA

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

ABA (abscisic acid) is a plant hormone. It is also called as stress hormone as its concentration increases during stress condition. During adverse environmental conditions like drought, it induces stomatal closure. This results in reduced transpiration rate during water stress condition.

Thus, the correct answer is option C.

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

Consider the following statements.
a. Copper is present in Cytochrome oxidase
b. Pantothenic acid is the precursor of Coenzyme A
c. Thiamine pyrophosphate is the prosthetic group in decarboxylases
d. Zinc is present in RNA and DNA polymerases
Which of these statements are correct?

  1. $1$ and $2$
  2. $2, 3$ and $4$
  3. $1, 2, 3$ and $4$
  4. $1, 3$ and $4$
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

All four statements are accurate: copper is a cofactor in cytochrome oxidase, pantothenic acid is a precursor for Coenzyme A, thiamine pyrophosphate serves as a prosthetic group for decarboxylases, and zinc is an essential structural or catalytic ion in DNA and RNA polymerases.

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

Match List I with List II and select the correct answer.

List-I(Name of chemical substance) List-II(Chemical structure)
a. Indoleacetic acid $1$. Benzene
b. a-naphthalene acetic acid $2$. Circular
c. Indolepyruvic acid $3$. Chain
d. Indolebutyric acid $4$. Anoymous
  1. A-$2$, B-$3$, C-$4$, D-$1$
  2. A-$1$, B-$4$, C-$3$, D-$2$
  3. A-$2$, B-$4$, C-$3$, D-$1$
  4. A-$1$, B-$3$, C-$4$, D-$2$
Reveal answer Fill a bubble to check yourself
A Correct answer
Multiple choice biology plant growth other plant hormones cytokinins, ethylene and abscisic acid plant hormones

Which one of the following is a synthetic cytokinin?

  1. Ethylene-diaminetetraacetic acid

  2. Carboboenzoxyglylalanine
  3. $6$-furfurylaminopurine
  4. $2, 4$-$5$ trichlorophenoxypropionic acid
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

6-furfurylaminopurine, also known as kinetin, is a synthetic cytokinin first isolated from autoclaved herring sperm DNA. The other options represent different chemical classes, such as plant growth regulators of other types or laboratory reagents.

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.