Solution of Chapter 8. Cell—Structure and Functions (NCERT Science Exemplar Book)

Choose the correct statement with respect to unicellular organisms:

Majority of cells cannot be seen directly with our naked eyes because:

Read the different combinations of terms given below:

The correct combination of terms with reference to an animal cell is _____.

Which one of the following term is not a part of the nucleus?

A suitable term for the various components of cells is

The jelly-like fluid substance present in cells is called

Read the following pairs of examples of organisms:

The pair that belongs to the group prokaryotes is_____

Read the following terms and select the pair that is related to inheritance of characters.

Choose the correct statement:

Green colour of leaves is due to presence of the pigment_____

The unit of measurement used for expressing the dimension (size) of cells is:

The most important function of the cell membrane is that it:

Paheli accidentally placed her hand over a flame and immediately pulled it back. She felt the sensation of heat and reacted due to the action of

Of the following parts of a cell listed below, name the part that is common to plant cell, animal cell, and a bacterial cell.

The thread-like structures present in the nucleus are

Identify the statement which is true for cells.

Which of the following is not a cell?

Which of the following feature will help you in distinguishing a plant cell from an animal cell?

Under a microscope, Paheli observes a cell that has a cell wall but no distinct nucleus. The cell that she observes is

Cheek cells do not have _______

Identify the correct statement.

Which of the following statements are true for eukaryotic cells?

(i) They do not have a nuclear membrane.

(ii) They have a well-organized nucleus.

(iii) They have a nuclear membrane.

(iv) Blue-green algae are eukaryotic cells.

Identify the correct statement about cells.

The table given below has certain terms and four blank spaces named A, B, C, and D.

From the options given below choose the correct combination of terms.

In leaves, name the cell organelle and pigment that is responsible for green color.

The instrument used to observe cells is ________

We do not sense any pain when we clip our nails or cut our hair. Why?

In a cell, where are the genes located?

Amoeba and Paramecium belong to which category of organisms?

What are the functions of the cell wall in plant cells?

Is the following statement correct? If it is wrong, correct the statement

Statement: “Unicellular organisms do not respire, only multicellular organisms respire”

Match the terms given in column I with their functions given in column II and fill the blanks given below the table:

A-_____; B-______; C-______; D-______

Observe the following diagram given as Fig. 8.1.

Answer the following questions.

A. Does it represent a plant cell or an animal cell?

B. Does it represent a prokaryotic cell or a eukaryotic cell?

Label the parts A to E in the given as Fig. 8.2 diagram.

Classify the following terms into cells, tissues, and organs and write in the tabular column given below.

RBC, WBC, Nerve cell, blood, muscle, blood vessels, brain, heart, hand

Read the following statements and write the appropriate term against each statement.

A. I control the functions of a cell. Who am I? ...................

B. I am like a policeman. I do not allow anything and everything to get in and out of the cell. Who am I? ...................

C. I transfer characters from parents to off springs. Who am I? ..................

Fill in the blanks with the terms given in the box below:

Nucleus, chromosomes, cell wall, cell membrane, protoplasm, cytoplasm, ribosome, cell organelles

The outermost layer of plant cells is the (a) beneath which is the …..(b) …….The term ….(c)….. refers to the jelly-like substance containing all the ….(d)….. The …..(e)…. contains thread-like structures called ….(f)…...

Cells consist of many organelles, yet we do not call any of these organelles as structural and functional unit of living organisms. Explain.

Why do plant cells have an additional layer surrounding the cell membrane? What is this layer known as?

The size of the cells of an organism has no relation to the size of its body. Do you agree? Give a reason for your answer.