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The internodal segments of tobacco stem ...

The internodal segments of tobacco stem the callus proliferated only if it contains ……..(i)………in addition to ………..(ii)……..

A

(i) Yeast extract , (ii) coconut milk

B

(i) Coconut milk , (ii) Auxin

C

(i) yeast extract , (ii) cytokinin

D

(i) coconut milk , (ii) Gibberellic acid

Text Solution

AI Generated Solution

The correct Answer is:
To solve the question regarding the internodal segments of tobacco stem and the conditions necessary for callus proliferation, we can break it down into clear steps: ### Step-by-Step Solution: 1. **Understanding Callus Formation**: - Callus is a mass of undifferentiated or disorganized cells that forms when plant tissues are cultured in vitro. It is essential for plant regeneration and can be induced by specific plant hormones. 2. **Identifying the Plant Tissues**: - The question specifically mentions the internodal segments of the tobacco stem. These segments are often used in plant tissue culture for callus induction. 3. **Role of Hormones in Callus Proliferation**: - For callus to proliferate, certain plant hormones must be present. The two main hormones involved in this process are auxins and cytokinins. 4. **Filling in the Blanks**: - The first blank (i) should be filled with "auxin" because it is crucial for the initial formation of callus. - The second blank (ii) should be filled with "cytokinins" because they work in conjunction with auxins to promote cell division and growth. 5. **Conclusion**: - Therefore, the complete statement is: "The internodal segments of tobacco stem the callus proliferated only if it contains **auxin** in addition to **cytokinins**." ### Final Answer: (i) auxin (ii) cytokinins
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