Draw a diagram of the nucleus of a cell, having chromosome number 6, as it would appear in the metaphase stage of mitosis and label the following parts in the diagram:
1. Aster
2. Achromatic spindle
3. Chromatid
4. Centromere
Mention the difference between mitosis and meiosis with reference to
1. Number of daughter cells formed at the end of the division.
2. The chromosome number of the daughter cells formed.
Account for the following briefly:
The pituitary gland is known as the ‘master gland’.
The pituitary gland controls the secretions of all the other endocrine glands of the body by producing tropic hormones. Therefore, the pituitary gland is known as the 'master gland'.
Account for the following briefly:
(iv) Herbaceous plants growing in well-watered soils are found to wilt on a hot day.