NEET Biology plant growth development mcqs,model,mock,grand exams

Plant Growth and Development Mock Exam-14

Question No:1

Assertion: Ethylene is a simple liquid PGR.
Reason: Etylene inhibits sprouting of potato tuber.

[A] If both the assertion and the reason are true and the reason is a correct explanation of the assertion
[B] If both the assertion and reason are true but the reason is not a correct explanation of the assertion
[C] If the assertion is true but the reason is false
[D] If both the assertion and reason are false



Question No:2

Assertion: The pigment which causes photoperiodic stimulus is called phytochrome.
Reason: Chemically phytochrome is a starch and lipid.

[A] If both the assertion and the reason are true and the reason is a correct explanation of the assertion
[B] If both the assertion and reason are true but the reason is not a correct explanation of the assertion
[C] If the assertion is true but the reason is false
[D] If both the assertion and reason are false



Question No:3

Assertion: Floral initiation is done by hormonal substance.
Reason: Hormonal substance is translocated from flowers to leaves.

[A] If both the assertion and the reason are true and the reason is a correct explanation of the assertion
[B] If both the assertion and reason are true but the reason is not a correct explanation of the assertion
[C] If the assertion is true but the reason is false
[D] If both the assertion and reason are false



Question No:4

Assertion: Vernalisation refers specially to the promotion of flowering by a period of low temperature.
Reason: Vernalisation also seen in biennial plants.

[A] If both the assertion and the reason are true and the reason is a correct explanation of the assertion
[B] If both the assertion and reason are true but the reason is not a correct explanation of the assertion
[C] If the assertion is true but the reason is false
[D] If both the assertion and reason are false



Question No:5

Assertion: Auxins have been used extensively in agriculture and horticulture.
Reason: They help to initiate rooting in stem cuttings.

[A] If both the assertion and the reason are true and the reason is a correct explanation of the assertion
[B] If both the assertion and reason are true but the reason is not a correct explanation of the assertion
[C] If the assertion is true but the reason is false
[D] If both the assertion and reason are false



Question No:6

Assertion: A plant hormone is a growth regulator.
Reason: Growth regulators promote or inhibit the growth.

[A] If both the assertion and the reason are true and the reason is a correct explanation of the assertion
[B] If both the assertion and reason are true but the reason is not a correct explanation of the assertion
[C] If the assertion is true but the reason is false
[D] If both the assertion and reason are false



Question No:7

One of the commonly used plant growth hormone in tea plantation is:

[A] Ethylene
[B] Abscisic acid
[C] Zeatin
[D] Indole-3-acetic acid



Question No:8

Root development is promoted by:

[A] Abscisic acid
[B] Auxin
[C] Gibberellins
[D] Ethylene



Question No:9

Phototropic curvature is the result of uneven distribution of

[A] Gibberellin
[B] Phytochrome
[C] Cytokinins
[D] Auxin



Question No:10

Photo periodism was first characterised in:

[A] Tobacco
[B] Potato
[C] Tomato
[D] Cotton



Question No:11

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

[A] Flowering
[B] Closure of stomata
[C] Fruit elongation
[D] Apical dominance



Question No:12

Vernalisation stimulates flowering in:

[A] Turmeric
[B] Carrot
[C] Ginger
[D] Zamikand



Question No:13

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

[A] Ethylene
[B] ABA
[C] IAA
[D] Zeatin



Question No:14

During seed germination its stored food is mobilized by:

[A] Ethylene
[B] Cytokinin
[C] ABA
[D] Gibberellin



Question No:15

Dr. F. Went noted that if coleoptiles tips were removed and placed on agar for one hour, the agar would produce a bending when placed on one side of freshly cut coleoptile stumps. Of what significance is this experiment?

[A] It made possible the isolation and exact identification of auxin
[B] It is the basis for quantitative determination of small amounts of growth – promoting substances
[C] It supports the hypothesis that IAA is auxin
[D] It demonstrated polar movement of auxins



Question No:16

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

[A] Abscissic acid
[B] Ethylene
[C] GAS
[D] Indole acetic acid



Question No:17

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

[A] Green plants need right to perform photosynthesis.
[B] Green plants seek light because they are phototropic.
[C] Light stimulates plant cells on the lighter side to grow faster
[D] Auxin accumulates on the shaded side, stimulating greater cell elongation there



Question No:18

Typical growth curve in plants is:

[A] Sigmoid
[B] Linear
[C] Stair – steps shaped
[D] Parabolic



Question No:19

Which of the following enhances or induces fusion of protoplast?

[A] Sodium chloride and potassium chloride
[B] Polyethylene glycol and sodium nitrate
[C] IAA and kinetin
[D] IAA and gibberellins



Question No:20

Auxin can be bioassayed by:

[A] Hydroponics
[B] Potometer
[C] Lettuce hypocotyl elongation
[D] Avena coleoptile curvature