Biology 1st Paper MCQ-Cumilla Board-2017

1. In which of the following plants, the pore remains open at night which is controlled and guarded by two special types of cell on the skin of the aerial part of the plants?

2. In which of the following does vegetative reproduction take place through their root?

3. The part labelled $B$ in the stem-

i. Gives rigidity to the plant

ii. Holds $\mathrm{O}_{2}$ and $\mathrm{CO}_{2}$

iii. Helps the plant to float

Which one is correct?

4. The part labelled $A$ in the stem-

5. Mili collected some floating slippery green substances from the water and kept it in a bowl. She covered the bowl and kept it under her bed. After few days, she saw those substance turned white.

The cause of the substance for turning into white is -