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The Cell Book Back Questions 6th Science Lesson 12

6th Science Lesson 12

12] The Cell

Book Back Questions with Answer and Do You Know Box Content

Do You Know?

Can you see a cell with your naked eyes? Cells are very minute and said to be microscopic cannot be seen with our naked eyes. They can be observed only through a specialized scientific instrument called “microscope”. Now a days an electron microscope is used to magnify the cells and observe the cells.

Cell size has no relation to the size of an organism. It is not necessary that the cells of, say an elephant be much larger than those of a mouse.

Approximate number of cells in the human body is 3.7 x 1013 or 37,000,000,000,000.

Choose the best answers:

1. The unit of measurement used for expressing dimension (size) of cell is _____________

(a) Centimetre

(b) millimetre

(c) micrometre

(d) Metre

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

3. A ‘control centre’ of the eukaryotic cell is

(a) Cell wall

(b) Nucleus

(c) Vacuoles

(d) Chloroplast

4. Which one of the following is not a unicellular organism?

(a) Yeast

(b) Amoeba

(c) Spirogyra

(d) Bacteria

5. Most organelles in a eukaryotic cell found in the____?

(a) Cell wall

(b) Cytoplasm

(c) Nucleus

(d) Vacuole

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.

State true or false. If false, correct the statement:

1. A cell is the smallest unit of life.

2. Nerve cell is the longest cell.

3. Prokaryotes were the first form of life on earth.

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

5. New cells are produced from existing cells.

Match the following:

1. Control centre – Cell membrane

2. Food producer (Plant cell) – Mitochondria

3. Gate of the nucleus – Nucleus

4. Gate of the cell – Chloroplast

5. Energy producer – Nuclear membrane

Arrange in a correct sequence:

1. Elephant, cow, bacteria, mango, Rose plant.

2. Hen egg, ostrich egg, insect egg.

Complete the analogy:

1. Prokaryote: Bacteria :: Eukaryote: __________

2. Spirogyra: Plant cell :: Amoeba: ______________

3. Food producer: Chloroplasts :: power house: ___________

Answers:

Choose the correct answer:

1. Micro meter 2. A Plant cell 3. Nucleus 4. Spirogyra 5. Cytoplasm

Fill in the blanks:

1. The Microscope 2. Chloroplast 3. Cell Wall 4. Robert Hooke 5. Largest

Say True or False:

1. True

2. True

3. True

4. False

Correct Statement: The cells of both plants and animals are made up of Organelles.

5. True

Match the following:

1. Nucleus 2. Chloroplast 3. Nuclear membrane 4. Cell membrane 5. Mitochondria

Arrange in a correct sequence:

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

2. Insect egg, Hen egg, Ostrich egg

Complete the analogy:

1. Alga 2. Animal cell 3. Mitochondria

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