Tag: plant hormones

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Questions Related to plant hormones

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

Choose the correct answer from the alternatives given.
Elongation of a genetically dwarf plant is possible by the application of:

  1. TAA

  2. GA3

  3. zeatin

  4. NAA
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Gibberellins (like GA3) are well-known for their ability to stimulate stem elongation and can overcome genetic dwarfism in plants by promoting internode growth.

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

Choose the correct answer from the alternatives given.
Spraying plants with a combination of auxins and gibberellins:

  1. promotes formation of parthenocarpic fruit

  2. kills broad-leaved dicot plants

  3. prevents senescence

  4. promotes fruit ripening
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

When sprayed on flowers, any of the plant hormones gibberellin, auxin and cytokinin could stimulate the development of parthenocarpic fruit.

So, the correct option is 'promotes the formation of parthenocarpic fruit'.

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

The hypothesis of algal origin of higher plants is based on which one of the following orders of Chiorophyta?

  1. Volvo ales

  2. Ultrichales

  3. Cladophorales

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

The hypothesis of the algal origin of higher plants (specifically the Charophyceae lineage) is often linked to the order Charales or related green algae, but Volvocales is sometimes cited in older or specific textbook contexts regarding colonial evolution.

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

Choose the correct answer from the alternatives given.
If a long-day plant has a critical night length of 9 hours then which of the following 24-hour cycles would prevent flowering:

  1. 16 hours light/8 hours dark

  2. 14 hours light/10 hours dark

  3. 4 hours light/8 hours dark/4 hours light/8 hours dark

  4. 8 hours light/8 hours dark/light flash/8 hours dark
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The critical photoperiod is the continuous duration of light which should not be exceeded in short day plants but should always be exceeded in long day plants. Here the critical night length for the long day plants are 9 hours which should more and the light phase should be smaller.

So, the correct option is '14 hours light/10 hours dark'.

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

Choose the correct answer from the alternatives given.
Bolting of floral shoots is triggered by a high concentration of:

  1. auxin

  2. gibberellins

  3. cytokinins

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

Gibberellins also promote bolting (internode elongation just prior to flowering) in beet, cabbages and many plants with rosette habit.

So, the correct option is 'gibberellins'.

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

Which of the following is true?

  1. Cytokinins helps in ripening of fruit.

  2. Gibberellins helps in ripening of fruit.

  3. Calcium carbide helps in ripening of fruit.

  4. Calcium carbonate helps in ripening of fruit.
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Calcium carbide is used for ripening fruit artificially in some countries. When calcium carbide comes in contact with moisture, it produces acetylene gas, which is quite similar in reaction to the natural ripening agent ethylene.

Thus, the correct answer is option C.

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

The weight of fruit in a plant by the number of dominant alleles of a certain number of genes. If seven weight categories are noticed, how many gene sites would be involved?

  1. Two

  2. Three

  3. Four

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

Genes are the chromosomal part that carries genetic information from one generation to another. Each gene has a pair of two contrasting alleles which is responsible for the effect of the gene in dominant and recessive traits. If seven characters of weight are there each will have two sites in the gene which shows recessive and dominant characters.

So, the correct option is 'Two'.

Multiple choice biology chemical coordination in plants cytokinins plant hormones plants and animal hormones

Delaying aging of leaves and opening of stomata are due to the action of _______

  1. Auxins

  2. Gibberellins

  3. Cytokinins

  4. Abscisic acid
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation
A. Auxins are the plant hormones which promote cell enlargement and cell differentiation. It also promote fruit growth. It is responsible for phototropic and geotropic responses of plants.
B. Gibberellins are plant hormones which promote cell enlargement and cell differentiation in the presence of auxins. It help in breaking the dormancy in seeds and buds. It also promote fruit growth. It stimulates elongation of shoots of various plants.
C. Cytokinins are plant hormones which promote cell division in plants. It also helps in breaking the dormancy in seeds and buds. The delay the ageing of leaves. It promotes opening of stomata.
D. Abscisic acid (ABA) is a  plant hormone which functions mainly as a growth inhibitor. It promotes the dormancy in seeds and buds [ this is the opposite of breaking the dormancy. It also promotes closing of stomata. It promotes falling of leaves. 
So, the correct answer is 'Cytokinins'.

Multiple choice biology chemical coordination in plants cytokinins plant hormones plants and animal hormones

Cytokinins are known to

  1. Inhibit cytoplasmic movement.

  2. Help in retention of chlorophyll.

  3. Influence water movement.

  4. Promote abscission layer formation.
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Cytokinins perform several other functions:
- Stimulates cell division.
- Stimulates morphogenesis in tissue culture.
- Stimulates the growth of lateral buds.
- Stimulates leaf expansion.
- Enhance stomatal opening