Samacheer Kalvi 6th Science Term 2 Unit 5 Book Back Questions and Answers:

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Samacheer Kalvi 6th Science Book Back Chapter 5 Term 2 Solution Guide PDF:

TN State Board Class 6th Science Subject Term 2 Unit 5 one mark and two mark solutions guide PDF available below.

6th Science – Term 2

Unit 5 The cell

I. Choose the appropriate answer:

1. The unit of measurement used for expressing the dimension (size) of the cell is
(a) centimeter
(b) millimeter
(c) micrometer
(d) meter
Answer: (c) micrometer

2. Under the microscope Priya observes a cell that has a cell wall and distinct nucleus. The cell that she observed is
(a) a plant cell
(b) an animal cell
(c) a nerve cell
(d) a bacteria cell
Answer: (a) a plant cell

3. A control centre’ of the eukaryotic cell is
(a) Cell wall
(b) Nucleus
(c) Vacuoles
(d) Chloroplast
Answer: (b) Nucleus

4. Which one of the following is not a unicellular organism?
(a) Yeast
(b) Amoeba
(c) Spirogyra
(d) Bacteria
Answer: (c) Spirogyra

5. Most organelles in a eukaryotic cell are found in the
(a) Cell wall
(b) cytoplasm
(c) nucleus
(d) Vacuole
Answer: (b) cytoplasm

II. Fill in the Blanks:

1. The instrument used to observe the cell is _______
2. I control the food production of a cell. Who am I? _______
3. I am like a policeman. Who am I _______ ?
4. The Term “ cell” was coined by _______
5. The egg of an Ostrich is the _______ single cell.

Answers:

1. microscope
2. chloroplast
3. cell wall
4. Robert Hooke
5. largest

III. True or False. If False, give the correct answer:

1. A cell is the smallest unit of life.
Answer: True

2. Nerve cell is the longest cell.
Answer: True

3. Prokaryotes were the first form of life on earth.
Ans: True

4. The organelles of both plants and animals are made up of cells.
Answer: True

5. New cells are produced from existing cells.
Answer: True

IV. Match the following:

Answer:

V. Arrange in a correct sequence:

1. Elephant, Cow, Bacteria, Mango, Rose plant.
Answer:
Bacteria, Rose plant, Mango, Cow, Elephant.

2. Hen egg, Ostrich egg, Insect egg.
Answer:
Insect egg, Hen egg, Ostrich egg.

VI. Analogy:

1. Prokaryote : Bacteria :: Eukaryote : _______
Answer: Plant or animal cell.

2. Spirogyra : Plant cell:: Amoeba :
Answer: animal cell.

3. Food producer : Chloroplasts :: Power house _______
Answer: mitochondria.

VII. Give a very short answer:

1. Who discovered the cell in 1665?
Answer:
The English scientist Robert Hooke discovered the cell in 1665 from cork slices kept under a microscope.

2. What type of cells do we have?
Answer:
We have Eukaryotic cells.

3. What are the essential components of a cell?
Answer:
The cell wall, cell membrane, cytoplasm, mitochondria, Chloroplasts, Vacuoles, Nucleus, and Nucleus membrane are essential components of a cell

4. What are the organelles found only in plant cell?
Answer:
Chloroplasts and cell walls are the organelles found only in plant cell.

5. Give any three examples of the eukaryotic cell?
Answer:
Plant cell, animal cell, fungi, and algae cell.

6. Which one is called as “Area of movement”?
Answer:
The cytoplasm is called as “Area of movement”.

7. Shiva said, “ Bigger onion has larger cells when compared to the cells of the smaller onion”! Do you agree with his statement or not? Explain Why?
Answer:
No, I don’t agree with the statement. Cell size has no relation to the size of an organism.

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