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Multiple Choice Question:
The nuclear membrane disappears in
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Multiple Choice Question:
The nuclear membrane and nucleolus become indistinguishable during
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Write the functional activity of the following structure:
Colchicine
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Column ‘II’ is a list of items related to ideas in Column ‘I’. Match the terms in Column ‘II’ with a suitable idea given in Column ‘I’.
| Column I | Column II |
| (i) Anaphase | (a) Chromosomes become arranged in a horizontal plane at the equator. |
| (ii) Prophase | (b) Daughter chromosomes move to opposite poles of the spindle. |
| (iii) Telophase | (c) Chromosomes become visible as fine, long threads. |
| (iv) Metaphase | (d) Chromosomes lose their distinctiveness and gradually become transformed into chromatin network. |
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The karyotype (set of chromosomes) shown below is taken from a dividing cell in a certain individual.
(i) Is the individual male or female? Explain your answer.
(ii) How would you expect
(a) a female cell and
(b) sperm cell to differ in chromosome composition?
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Give Reasons for the following:
Transplanting of seedlings to a flowerbed in the evening is better than doing so in the morning.
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Give Reasons for the following:
Land plants die if their roots remain waterlogged.
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What is meant by the term transpiration stream?
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Give Reasons for the following:
Young plants wilt on a hot sunny day.
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Give Reasons for the following:
Plants absorb more water than their requirement
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Give Reasons for the following:
Balsam plants wilt during midday even if the soil is well watered.
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What are lenticels? Where are they found?
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Give Reasons for the following:
Forest bring in the rain, transpiration is the cause.
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Give Reasons for the following:
Why do some herbaceous plants show wilting of leaves during mid-day which again recover in the evening?
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What are the advantages of transpiration to the plant?
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What are the disadvantages of transpiration?
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Explain the Term
Transpiration
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Explain the term:
Cuticular transpiration
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