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What Are Receptor Proteins?

Receptor proteins are present in the cell membrane and are perceptive to the presence of particular extracellular molecules known as ligands.... View Article

What Are Anchoring And Recognition Proteins?

Anchoring proteins are the membrane proteins that attach the cell membrane to other structures thus stabilizing its position. Within the cell, a... View Article

Phototropic curvature is the result of uneven distribution of

A) phytochrome B) gibberellin C) auxin D) cytokinins Answer:C) auxin Explanation: When plants are exposed to the light unilaterally. The auxin... View Article

Vernalization stimulates flowering in

A) turmeric B) jimikand C) ginger D) carrot Answer:D) carrot Explanation: Vernalisation refers to the requirement of a low temperature to... View Article

Which one of the following generally acts as an antagonist to gibberellins?

A) Ethylene B) Zeatin C) IAA D) ABA Answer:D) ABA Explanation: ABA is a plant growth inhibitor. It induces dormancy and promotes senescence.... View Article

Through their effects on plant growth regulators, what do the temperature and light control in the plants?

A) Flowering B) Apical dominance C) Fruit elongation D) Closure of stomata Answer:A) Flowering Explanation: Temperature and light control... View Article

The pineapple which under natural condition is difficult to blossom has been made to produce fruits throughout the year by application of

A) Phenyl acetic acid B) NAA, 2, 4-D C) IAA, IBA D) Cytokinin Answer:B) NAA, 2, 4-D Explanation: Auxins are plant hormones, which... View Article

During seed germination its stored food is mobilised by

A) gibberellin B) ABA C) cytokinin D) ethylene Answer:A) gibberellin Explanation: Gibberellins induce the synthesis of ⍺-amylase in... View Article

Which one of the following growth regulators is known as ‘stress hormone’?

A) Ethylene B) Abscisic acid C) Indole acetic acid D) GA3 Answer:B) Abscisic acid Explanation: Abscisic acid or ABA is a plant growth... View Article

Typical growth curve in plants is

A) parabolic B) stairsteps shaped C) linear D) sigmoid Answer:D) sigmoid Explanation: A growth curve is the representation of the... View Article

What causes a green plant exposed to the light, on only one side, to bend towards the source of light as it grows?

A) Auxin accumulates on the shaded side, stimulating greater cell elongation there B) Light stimulates plant cells on the lighted side to... View Article

Auxin can be bioassayed by

A) lettuce hypocotyl elongation B) potometer C) hydroponics D) Avena coleoptile curvature Answer:D) Avena coleoptile curvature... View Article

The Avena curvature is used for bioassay of

A) Ethylene B) IAA C) GA3 D) ABA Answer:B) IAA Explanation: Avena curvature test is used for bioassay of auxins. Etiolated oats... View Article

Phytochrome is a

A) glycoprotein B) flavoprotein C) chromoprotein D) lipoprotein Answer:C) chromoprotein Explanation: Phytochrome is a chromoprotein. It acts as... View Article

You are given a tissue with its potential for differentiation in an artificial culture. Which of the following pairs of hormones would you add to the medium to secure shoots as well as roots?

A) Auxin and cytokinin B) IAA and gibberellin C) Gibberellin and abscisic acid D) Auxin and abscisic acid Answer: A) Auxin and cytokinin... View Article

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