Samacheer Kalvi 7th Science Term 2 Unit 4 Book Back Questions and Answers:

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Samacheer Kalvi 7th Science Book Back Chapter 4 Term 2 Solutions Guide PDF:

TN State Board Class 7th Science Subject Term 2 Unit 4 one mark and two mark solutions guide PDF available below.

Science – Term 2

Unit 4 – Cell Biology

I. Choose the correct answers:

1. Basis unit of life.
(a) Cell
(b) Protoplasm
(c) Cellulose
(d) Nucleus
Answer: (a) Cell

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

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

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

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

II. 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 cells do not contain a ________.
4. Unicellular organisms can only be seen under a ________.
5. Cytoplasm plus nucleoplasm is equal to ________.

Answer:

1. cytoplasm
2. chloroplast
3. Nucleus
4. Microscope
5. Protoplasma

III. True or False – If False gives the correct answer:

1. Animal cells have a cell wall.
Answer: False, Plant cells have a cell wall.

2. Salmonella is a unicellular bacteria.
Answer: True

3. Cell membrane is fully permeable.
Answer: False, Cell membrane is selectively permeable.

4. Only plant cells have chloroplasts.
Answer: True.

5. Human stomach is an organ.
Answer: True.

6. Ribosomes are small organelles with a membrane.
Answer: False. Ribosomes are small organelles without a membrane.

IV. Match the following:

Question 1.

1. Transporting channel – Nucleus
2. Suicidal bag – Endoplasmic reticulum
3. Control room – Lysosome
4. Powerhouse – Chloroplast
5. Food producer – Mitochondria

Answer:

1. Transporting channel – Endoplasmic reticulum
2. Suicidal bag – Lysosome
3. Control room – Nucleus
4. Powerhouse – Mitochondria
5. Food producer – Chloroplast

V. Analogy:

1. Bacteria : microorganism :: mango tree :________
Answer: Macroorganism.

2. Adipose : tissue :: eye :_________
Answer: Organ

3. Cell wall: plant cell:: centriole :_________
Answer: Animal cell.

4. Chloroplast: photosynthesis :: mitochondria :________
Answer: Respiration.

VI. Choose Use to connect 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
Answer: (a) Both A and R are 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.
Answer: (a) Both A and R are true

VII. Very short answer:

1. What are the functions of the cell walls in a plant cell?
Answer:
Protection maintains the shape of the cell and acts as a protective framework.

2. Which organelle uses energy from sunlight to make starch?
Answer:
Chloroplast uses energy from sunlight to make starch.

3. What are the main things in a nucleus?
Answer:
Nuclear envelope, Nucleolus, chromatin body.

4. What does the cell membrane do?
Answer:
It acts as a boundary of the cell and protects it.

5. Why lysosomes are known as scavengers of the cell?
Answer:
The lysosomes are the main digestive compartments of a cell and digest damaged cell parts. Hence they are called scavengers of the cell.

6. Teacher said “A virus is not an organism” Do you agree with this statement or not? Explain Why?
Answer:
True I agree with the statement. A virus acts as a living organism within the body of a host and behaves like a non-living thing outside. It lacks a cell wall, cell membrane, cytoplasm, and organelles. Hence it is not an organism.

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