Write two basic structural differences between parenchyma and collenchyma tissues.
Q.1. Write two basic structural differences between parenchyma and collenchyma tissues.
Ans. (i) Parenchyma tissue. Thin cell wall, loosely packed (large intercellular space).
(ii) Collenchyma tissue: Irregularly thickened at the corners, very little intercellular space, actually is a group of many parenchyma cells.
Q.2. Give reason. Tissue ‘A’ – cells are filled with fat globules and the tissue acts as an insulator.
Tissue ‘B’ has cylindrical branched cells and the tissue shows rhythmic contraction and relaxation throughout life.
Ans. Tissue ‘A’ – Adipose tissue.
Present just below epithelium.
Tissue ‘B’ – Cardiac muscle.
Present in heart.
Q.3. (a) Voluntary muscles are also known as skeletal muscles. Justify.
(b) Give two structured characteristics of these voluntary muscles.
Ans. (a) Attached to limb bones and help in their movement.
(b) (i) Presence of light and dark bands.
(ii) Multinucleated.
(iii) Cylindrical and unbranched. (any two)
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