Cell Biology

Samacheer Book Back Questions And Answers For Science Standard 7 Term 2 “Cell Biology“

I. Choose the correct answers:
1. Basis unit of life.
(a) Cell
(b) Protoplasm
(c) Cellulose
(d) Nucleus

2. I am the outer most layer of an animal cell. Who am I?
(a) Cell wall
(b) Nucleus
(c) Cell membrane
(d) Nuclear membrane

3. Which part of the cell is called the brain of the cell?
(a) Lysosome
(c) Mitochondria
(b) Ribosome
(d) Nucleus

4. _____ helps in cell division.
(a) Endoplasmic reticulum
(b) Golgi complex
(c) Centriole
(d) Nucleus

5. Suitable term for the various components of cell is _____.
(a) Tissue
(b) Nucleus
(c) Cell
(d) Cell organelle

Fill in the blanks:
1. The jelly like substance present in the cell is called _____.
2. I convert the Sun’s energy into food for the plant. Who am I? _____.
3. Mature Red blood cell do not contain a _____.
4. Unicellular organisms can only be seen under a _____.
5. Cytoplasm plus nucleoplasm is equal to _____.

Answers:
1. Cytoplasm
2. Chloroplast
3. Nucleus
4. Microscope
5. Protoplasm

III. True or False – If False give the correction answer:
1. Animal cells have a cell wall.
2. Salmonella is a unicellular bacteria.
3. Cell membrane is fully permeable.
4. Only plant cells have chloroplasts.
5. Human stomach is an organ.
6. Ribosomes are small organelles with a membrane

Answers:
1. False (Plant cells have a cell wall)
2. True
3. False (Cell membrane is partial permeable)
4. True
5. True
6. False (Ribosomes are small organelles without a membrane)

IV. Match the following:
1. Transporting channel             A. Nucleus
2. Suicidal bag                           B. Endoplasmic reticulum
3. Control room                         C. Lysosome
4. Power house                          D. Chloroplast
5. Food producer                       E. Mitochondria

Answers:
1. B
2. C
3. A
4. E
5. D

V. Analogy:
1. Bacteria: microorganism:: mango tree:_____.
2. Adipose: tissue:: eye:_____.
3. Cell wall: plant cell:: centriole: _____.
4. Chloroplast: photosynthesis:: mitochondria: _____.

Answers:
1. Macro organism
2. Organ
3. Animal cell
4. Respiration

VI. Choose the correct alternative from the following:
1. Assertion (A): Tissue is a group of dissimilar cells.
Reason (R): Muscle is made up of Muscle cell.
(a) Both A and R are true
(b) Both A and R are false
(c) A is true but R is false
(d) A is false but R is true

2. Assertion (A): Majority of cells cannot be seen directly with naked eye because.
Reason (R): Cells are microscopic.
(a) Both A and R are true
(b) Both A and R are false
(c) A is true but R is false.
(d) A is false but R is true.

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