Which of the following cells can change their shape ?

A) White blood cell

B) Amoeba cell

C) Red blood cell

D) Euglena cell

Which of the following are prokaryotes ?

Which of the following human system includes oesophagus ?

The non-living part of a tomato cell is its :

The part of P and Q are present only in plant cells, and they are not present in animal cells. The part P contains a green pigment called R whereas part Q is made of a tough material S. The part P takes part in the food making process whereas part Q gives shape and support to the plant cell.

(a) What is (i) P, and (ii) Q?

(b) What is (i) R, and (ii) S?