Samacheer Kalvi 7th Science Term 2 Unit 4 Solutions

Samacheer Kalvi 7th Science Term 2 Unit 4 Book Back Question and Answers/Solutions:

Samacheer Kalvi Class 7th Std Science Book Back 1 Mark and 2 Mark Question & Answers PDF uploaded and available below. Class 7th Standard New Syllabus 2022 to 2023 Book Back Question & Answer solutions available for both English and Tamil Medium. Class 7 New Science Book Term 2 Unit 4 – Cell Biology Answers/Solutions Guide are provided on this page. 7th Std Science Book is of 1st Term consists of 7 units, 2nd and 3rd Term consists of 6 units. All Units/Chapters of Term 1st, 2nd, 3rd Science Book Back One, and Two Mark Solutions are given below.

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

7th Science Subject 1 Mark and 2 Mark Solutions Guide PDF available below. Click the Download option to download the book back 1 Mark & 2 Mark questions and answers. Take the printout and use it for exam purposes.

7th Science – Term 2 Chapter 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 cell is _________
(a) Tissue
(b) Nucleus
(c) Cell
(d) Cell organelle
Answer: (d) Cell organelle

II. Fill in the blanks:

The jelly like substance present in the cell is called _______.
I convert the Sun’s energy into food for the plant. Who am I?_________.
Mature Red blood cell do not contain a ________.
Unicellular organisms can only be seen under a ________.
Cytoplasm plus nucleoplasm is equal to ________.

Answer:

cytoplasm
chloroplast
Nucleus
Microscope
Protoplasma

III. True or False – If False give the correction 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.

Transporting channel – Nucleus
Suicidal bag – Endoplasmic reticulum
Control room – Lysosome
Power house – Chloroplast
Food producer – Mitochondria

Answer:

Transporting channel – Endoplasmic reticulum
Suicidal bag – Lysosome
Control room – Nucleus
Power house – Mitochondria
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 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 cell wall in plant cell?
Answer:
Protection, maintains shape of cell and acts as 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 cell membrane do?
Answer:
It acts as boundary of 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 cell wall, cell membrane, cytoplasm and organelles. Hence it is not a organism.