Class 11th Chapter 15. Plant Growth and Development

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1. Typical growth curve in plants is

linear

stair steps shaped

parabolic

sigmoid

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2. In order to increase the yield of sugarcane crop, which of the following plant growth regulators should be sprayed?

cytokinins

ethylene

auxins

gibbrellins

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3. It takes very long for pineapple plants to produce flowers. Which combination of hormones can be applied to artificially induce flowering in pineapple plants throughout the year to increase yield?

gibbrellin and abscisic acid

cytokinin and abscisic acid

auxin and ethylene

gibberellin and cytokinin

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4. Fruit and leaf drop at early stages can be prevented by the application of

cytokinins

ethylene

auxins

gibberellic acid

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

Gibberellin and abscisic acid

IAA and gibberellin

Auxin and cytokinin

Auxin and abscisic acid

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6. The Avena curvature is used for bioassay of

IAA

ethylene

ABA

GA3

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7. Auxin can be bioassayed by

lecttuce hypocotyl elongation

Avena coleoptiles curvature

hydroponics

photometer

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

light stimulates plant cells on the lighted side to grow faster

Auxin accumulates on the shaded side, stimulating graeter cell elongation there

green plants need light to perform photosynthesis

green plants seek light because they are phototropic

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9. Dr F went noted that if coleoptile 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?

it made possible the isolation and exact identification of auxin

it is the basis for quantitative determination of small amounts of grwoth promoting substances

it supports the hypothesis that IAA is auxin

it demonstrated polar movement of auxins

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10. Which one of the growth regulators is known as "stress hormone"?

Ethylene

Abscisic acid

GA3

IAA

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11. During seed germination, its stored food is mobilised by

ABA

ethylene

cytokinin

gibberellin

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

Apical dominance

flowering

closure of stomata

fruit elongation

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

Zeatin

ethylene

ABA

IAA

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14. Which one of the following is correctly matched?

passive transport of nutrients - ATP

Apoplast - plasmodesmata

potassium - readily mobilisation

Bakane of rice seedings - F.Skoog

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15. One of the commonly used plant growth hormone in tea plantations is

ethylene

abscisic acid

zeatin

IAA

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