Practice free Growth and Development in Plants (Botany) NEET multiple-choice questions online with instant answers and detailed explanations. No login required.
In tissue culture experiments, leaf mesophyll cells are put in a culture medium to form callus. This phenomenon may be called as:
Mature cells regaining ability to divide → dedifferentiation (callus formation).
Spraying of which of the following phytohormone on juvenile conifers helps in hastening the maturity period, that leads to early seed production?
GA accelerates maturity in conifers, hastening early seed production.
Match List I with List II:
| List I | List II |
|---|---|
| A. Iron | I. Synthesis of auxin |
| B. Zinc | II. Component of nitrate reductase |
| C. Boron | III. Activator of catalase |
| D. Molybdenum | IV. Cell elongation and differentiation |
Iron → catalase; Zinc → auxin; Boron → cell elongation; Mo → nitrate reductase.
Auxin is used by gardeners to prepare weed-free lawns. But no damage is caused to grass as auxin
2,4-D selectively kills dicot weeds; mature monocots (grasses) are unaffected.
The capacity to generate a whole plant from any cell of the plant is called:
Totipotency = ability of a single cell to develop into a complete organism.
Formation of interfascicular cambium from fully developed parenchyma cells is an example for:
Mature parenchyma regaining meristematic capacity → dedifferentiation.
Spraying sugarcane crop with which of the following plant growth regulators, increases the length of stem, thus, increasing the yield?
Gibberellins cause stem elongation; spraying sugarcane with GA increases internode length and thus the yield.
Which of the following are fused in somatic hybridization involving two varieties of plants?
Somatic hybridization fuses naked plant cells (protoplasts) after enzymatic removal of cell walls.
Which one of the following phytohormones promotes nutrient mobilization which helps in the delay of leaf senescence in plants?
Cytokinins promote nutrient mobilisation towards leaves, thereby delaying their senescence (the "richmond–lang effect").
Read the following statements on plant growth and development. A. Parthenocarpy can be induced by auxins. B. Plant growth regulators can be involved in promotion as well as inhibition of growth. C. Dedifferentiation is a pre-requisite for re-differentiation. D. Abscisic acid is a plant growth promoter. E. Apical dominance promotes the growth of lateral buds. Choose the option with all correct statements:
A, B and C are correct. D is wrong (ABA is an inhibitor/stress hormone) and E is wrong (apical dominance suppresses lateral bud growth).
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