Tag: biology

Questions Related to biology

Hormone produced during leaf fall is

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

  1. Cytokinin

  2. Florigen

  3. ABA

  4. IAA

Show answer
Correct Option: C
Explanation:

Leaf abscission is a detachment or fall of older leaves. It occurs at the base of the petiole. During leaf fall, high synthesis of abscisic acid is observed along with decrease in the concentration of auxin. It loosens the cell wall and cells separate which ultimately leads to leaf abscission

Thus, the correct answer is option C.

Under water stress, plants increase the synthesis of ______________.

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

  1. Gibberellic acid

  2. Cytokinin

  3. Auxins

  4. Abscisic acid

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Correct Option: A

How many high-energy phosphate bond equivalents are utilized in the process of activation of amino acids for protein synthesis?

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

  1. Four

  2. Two

  3. One

  4. Three

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Correct Option: A

Which one of the following is not in the commonly found vegetation of the desert of Indus Plain?

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

  1. Ceriops roxburghiana

  2. Prosopis specigera

  3. Salvadora oleoldes

  4. Tamarix articulata

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Correct Option: A

Ottelia alsimodies(Linn.) Pers. syn. PI, $1:400.1807$ stratiotes alsimoides Linn. Sp. PI. $535.1753$. In this citation steatites alimonies Linn. Is a ______________.

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

  1. Basionum

  2. Autonym

  3. Tautonym

  4. Homonvm

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Correct Option: A

Initiation codons for protein synthesis are

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

  1. UUU and GGG

  2. AAU and UAA

  3. AUG and GUA

  4. GUG and AUG

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Correct Option: D

The most commonly used growth regulator to induce somatic embryogenesis is?

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

  1. BAP

  2. $2, 4$-D

  3. IAA

  4. GA$3$

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Correct Option: A

Choose the correct answer from the alternatives given.
The phytochrome system helps to entrain the biological dock by indicating to a plant that light is present when:

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

  1. Pr is rapidly converted to Pfr

  2. Pfr is slowly converted to Pr

  3. Pr and Pfr are equal in concentration

  4. red light is absorbed by Pfr

Show answer
Correct Option: A
Explanation:

The biological clock is the seasonal or physiological activities of the plant which changes according to time, season etc. When the light is present at the time of the night, the phytochrome system sends the signal to the biological clock which results in the activation of phytochromes thus converting Pr (Inactive form) to Off (active form). This results in the flowering of plants.

So, the correct option is 'Pr is rapidly converted to Pfr'.

Which one of the following substances plays an important role in biochemical defense of host plants?

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

  1. Mycotoxin

  2. Phytoalexin

  3. Pathotoxin

  4. Vivotoxin

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Correct Option: A

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

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

  1. TAA

  2. GA3

  3. zeatin

  4. NAA

Show answer
Correct Option: B