NEET Biology: Growth regulators-cytokinin Practice Questions
14 free multiple-choice questions on Growth regulators-cytokinin (Plant Growth and Development) for NEET Biology, each with the correct answer and a step-by-step explanation. Attempt a question, then reveal the solution to check your reasoning.
Practice thousands more NEET questions in the app →Q1. Which tissue is characterized by high levels of cytokinin activity to facilitate rapid cell division?
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Correct answer: A — Meristem
Meristematic tissues are regions of active cell division, and they respond strongly to growth regulators like cytokinin to facilitate rapid cell proliferation.
Q2. Which type of plant tissue is highly sensitive to the presence of cytokinin for cell division?
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Correct answer: D — Meristem
Meristematic tissues, which are areas of active cell division, are highly responsive to cytokinins to promote cell division.
Q3. The primary function of cytokinin in plant development is related to the promotion of:
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Correct answer: C — Cell division
As a growth regulator, cytokinin's main action is stimulating cell division, which leads to increased cell number and subsequent growth.
Q4. Which of the following is the primary role of cytokinin in plant growth and development?
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Correct answer: D — To promote cell division
Cytokinin is a major growth regulator that promotes cell division (cytokinesis) and cell differentiation in plants.
Q5. Cytokinin acts as a growth regulator by influencing the cell cycle. Which cellular process is primarily regulated by cytokinin in plant cells?
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Correct answer: A — Mitosis (Cell Division)
Cytokinin stimulates the transition through the cell cycle, primarily promoting mitosis (cell division) in meristematic tissues.
Q6. Cytokinin is primarily synthesized in which part of the plant?
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Correct answer: A — Leaves
While cytokinin is synthesized throughout the plant, the leaves are often the main sites of active cytokinin production related to growth regulation.
Q7. If the concentration of cytokinin is significantly increased in a plant system, what is the expected outcome regarding cell activity?
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Correct answer: C — Increased cell division
As a growth regulator, increased cytokinin levels generally stimulate cell division and promote cell proliferation.
Q8. Cytokinin primarily acts as a growth regulator in plants by promoting the activity of which process in meristematic tissues?
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Correct answer: C — Cytokinesis (cell division)
Cytokinin is a crucial plant hormone that promotes cell division (cytokinesis) and cell cycle progression in meristematic tissues, thereby facilitating cell proliferation and growth.
Q9. Cytokinin is known to play a significant role in maintaining the balance between growth and senescence in plant tissues. If cytokinin levels are maintained at an optimal level, it helps to promote:
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Correct answer: A — Balanced growth and differentiation
Optimal cytokinin levels facilitate balanced growth and differentiation, preventing premature senescence or uncontrolled growth.
Q10. Cytokinin is often applied in plant tissue culture to induce which specific response?
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Correct answer: A — Callus formation
Cytokinin is widely used in plant tissue culture to promote undifferentiated cell proliferation, leading to the formation of callus tissue.
Q11. The primary effect of cytokinin on plant cells is related to which process?
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Correct answer: A — Cell division
Cytokinin acts as a mitogen, promoting the cell cycle and thus enhancing cell division.
Q12. The presence of high cytokinin levels in a plant tissue generally leads to the promotion of which type of growth?
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Correct answer: B — Lateral growth (branching)
Cytokinin is strongly associated with promoting cell division and thus, the formation of lateral buds and branching, which is a form of lateral growth.
Q13. Cytokinin is primarily known for its role in promoting cell division and differentiation. Which of the following statements accurately describes the main role of cytokinin in plant development?
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Correct answer: D — It stimulates cell division and controls the development of lateral buds.
Cytokinins are growth regulators that promote cell division (cytokinesis) and cell differentiation. They are particularly important in regulating the initiation and development of lateral buds, thereby influencing shoot growth and branching.
Q14. In the context of plant growth, cytokinin is essential for promoting the development of which specific type of plant tissue?
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Correct answer: C — Apical meristem
Cytokinin plays a crucial role in the activity and differentiation of the apical meristem, which is responsible for primary growth (length and apical growth) in the shoot system.
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