Biology 2nd Paper CQ-Dinajpur Board-2019

What is Accommodation?

Which gland is called the master gland and why?

Describe the structure of portion labelled as ' $\mathrm{A}$ ' in the stem.

What are the preventive measures should be taken to prevent the infection of ' $\mathrm{A}$ ' labelled part of the figure? Give your opinion.

What is menstrual cycle?

What do you mean by 'implantation?

Describe the structure of the cell produced by the process of X, given in the stem.

If the natural fusion of the reproductive cells produced from the process of $\mathrm{X}$ and $\mathrm{Y}$ failed, concave can be performed in an artificial way Give your supportive opinion.

What is species?

Why whale is not fish?

Write down the differences of the classes of fig-' $\mathrm{A}$ ' and 'B' in the stimulus.

For successful flying adaptation a lot of changes are occurred in a class of vertebrate marked as ' $\mathrm{C}$ ' Analyze it.

What is mesoglea?

Why the coelenterons of hydra is called gastrovascular cavity?

Describe the structure of the epidermal cell in the stem.

Analyze the last statement in the stem.

What is taxis?

Write down the characteristics of innate behaviour.

The experiment shown in fig ' $\mathrm{A}$ ' in the stem is an example of conditioned reflex action Explain it.

The behaviour of 'B' is an example of altruism Give your supportive opinion.