Question
What is the direct cell division? Explain with an example.
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Answer
Amitosis is the direct cell division. It is the simplest type of cell division in which there is no spindle formation or condensation of fibers. The nucleus is directly divided into two, e.g., bacteria.
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Complete the following table by filling in the blank spaces numbered 1 to 8:
| Gland | Secretions | Effect on body |
| (1) ……….. | oestrogen | (2) ……….. |
| Alpha cells of islets of Langerhans | (3) ……….. | (4) ……….. |
| (5) ……….. | (6) ……….. | Protruding eyes |
| (7) ……….. | (8) ……….. | Gigantism |
Differentiate between the following:
Lymphocytes and Monocytes
Lymphocytes and Monocytes
What is the significance of meiosis?
Give Reasons for the following:
Transplanting of seedlings to a flowerbed in the evening is better than doing so in the morning.
Transplanting of seedlings to a flowerbed in the evening is better than doing so in the morning.
What changes occur at the time of birth?
How does colchicine act as mitotic poison? Is there any advantage of it?
It is better to transplant seedlings in a flower-bed in the evening and not in the morning.
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(iii) Discuss the role of the kidneys in excretion.
(i) What are the organs involved in excretion in human body and the substances excreted by the excretory system?
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Draw a diagram of the human eye as seen in a vertical section and label the parts which suit the following descriptions relating to the:
(i) photosensitive layer of the eye.
(ii) structure which is responsible for holding the eye lens in its position.
(iii) structure which maintains the shape of the eyeball and the area of no vision.
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(i) photosensitive layer of the eye.
(ii) structure which is responsible for holding the eye lens in its position.
(iii) structure which maintains the shape of the eyeball and the area of no vision.
(iv) anterior chamber seen in front of the eye lens.
(v) outermost transparent layer seen in front of the eyeball.
Draw a labelled diagram to show the metaphase stage of mitosis in an animal cell having ‘6’ chromosomes.