Question

1-Branched striated muscle fibres interconnected by oblique bridges are :

(a) unstriated muscle fibres. (b) striated muscle fibres. (c) cardiac muscle fibres. (d) skeletal muscle fibres.

2-Plant cells with thickened at corners, non lignified cell walls are :

(a) parenchyma. (b) collenchyma. (c) aclerenchyma. (d) epidermal cell

Answer 1

1. The cardiac muscle fibers are branched and the fibers are interconnected by oblique bridges.
2. Collenchyma cells have irregular thickening and non lignified cell walls. The cell walls of these cells are made up of cellulose and pectin.