Question1 Nucleus is an important component of the living cell. It is generally spherical and located in the centre of the cell. With a microscope of higher magnification, we can see a smaller spherical body in the nucleus. In addition, nucleus contains thread like structure called chromosome.

Questions 2 (chose the correct answer)

(i). The hereditary unit in the chromosome.

a. Gene

b. Nucleus

c. DNA

d. Ribosome

(ii). The cell having nuclear material without nuclear membrane.

a. Eukaryotes

b. Prokaryotes

c. Both A and B

d. None of these

(iii).The jelly like substance in the cell

a. Protoplasm

b. Cytoplasm

c. Organelles

d. None of these

(iv). The thick layer around the cell membrane in plants.

a. Plasma membrane

b. Cell wall

c. Nuclear membrane

d. Outer membrane

(v). Exchange of materials in nucleus takes place through

a. Cell wall

b. Plasma membrane

c. Nuclear membrane

d. Cell membrane

2. How will you differentiate a prokaryotic cell from a eukaryotic cell?

3. Explain the structure of a nucleus with a well labeled diagram?

4. Mitochondria are known as the power house of the cell. Justify?

5. How are cells being protected from the foreign materials?

6. Differentiate between plant cell and animal cell?

Note: 2, 3, 4, 5, 6 are 3 marks questions

Answer pls