Tag: cytokinins, ethylene and abscisic acid

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Questions Related to cytokinins, ethylene and abscisic acid

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

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'.