NCERT Solutions for Class 8 Science Cell Structure and Functions

Ch-8 Cell: Structure and Functions

1. Indicate whether the following statement are true (T) or false(F).

(a) Unicellular organisms have one-celled body.  (T/F)

(b) Muscles cells are branched.     (T/F)

(c) The basic living unit of an organism is an organ.  (T/F)

(d) Amoeba has irregular shape.    (T/F)

Ans. (a) T

(b) F

(c) F

(d) T

2. Make a sketch of the human nerve cell. What function do nerve cells perform?

Ans.

Nerve cell-

3. Write short notes on the following.

(a) Cytoplasm

(b)Nucleus of a cell

Ans. (a) Cytoplasm- It is the jelly-like substance found in between the nucleus and the cell membrane. It contains many cell organelles. Cytoplasm along with nucleus forms the protoplasm.

(b) Nucleus-  It is a spherical structure located in the Centre of the cell. It is known as brain of the cell as it controls the activities of cells. It is separated from cytoplasm by a membrane called nuclear membrane.

4. Which part of the cell contains organelles?

Ans. Cytoplasm contains organelles of the cell.

NCERT Solutions for Class 8 Science Cell Structure and Functions

5. Make sketches of animal and plant cells. State three differences between them.

Ans.

Difference between plant and animal cell-

6. State the difference between eukaryotes and prokaryotes.

Ans. Eukaryotes have well-organized nucleus with nuclear membrane while prokaryotes do not have well organized nucleus.

Prokaryotic cell is generally smaller in size than eukaryotic cells.

NCERT Solutions for Class 8 Science Cell Structure and Functions

7. Where are chromosomes found in a cell? State their function.

Ans. Chromosomes are found in the nucleus of the cell. They carry genes and help in inheritance of characters from the parents to the offspring

NCERT Solutions for Class 8 Science Cell Structure and Functions

8. ‘Cells are the basic structural units of living organisms’. Explain.

Ans. All the living organisms are made of cells either unicellular or multicellular. The basic functions of life like respiration, assimilation and all major metabolic activities are carried inside the cell. So, cell is known as structural and functional units of living organism.

NCERT Solutions for Class 8 Science Cell Structure and Functions

9. Explain why chloroplasts are found only in plant cells?

Ans. Chloroplast contains chlorophyll which synthesizes food in plants by the process of photosynthesis. No photosynthesis occurs in animals. So, they do not contain chloroplast.

NCERT Solutions for Class 8 Science Cell Structure and Functions

10. Complete the crossword with the help of clues given below.^

 Across

1. This is necessary for photosynthesis.

3. Term for components present in the cytoplasm.

6. The living substance in the cell.

8. Units of inheritance present on the chromosomes.

 Down

1. Green plastids

2. Formed by collection of tissues

4. It separates the contents of the cell from the surrounding medium.

5. Empty structure in the cytoplasm.

7.  A group of cells.

 Ans.

NCERT solutions for Class 8 Science

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