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Infinity Learn’s NCERT Exemplar Solutions for Class 8 Science Chapter 8 are written by subject experts to help students comprehend the subjects covered in the chapter. The revision notes included in this work can be used by students. Students will use the solved problems to prepare for their exams on the chapter. Students may learn and comprehend the subject properly with the NCERT Exemplar Solutions for Chapter 8 Class Science “Cell structure and function.” Additionally, they may get these NCERT Exemplar Solutions for free from Infinity Learn.
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Access Answers to NCERT Exemplar Class 8 Science Chapter 8 – Cell Structure and Functions
Multiple Choice Questions
- Choose the correct statement with respect to unicellular organisms:
(a) in unicellular organisms, tissues work in coordination to perform different functions.
(b) unicellular organisms do not require food.
(c) unicellular organisms respire and reproduce.
(d) all unicellular organisms move by cilia.
Answer – (c) unicellular organisms respire and reproduce.
Explanation:
Correct statement with respect to unicellular organisms is (c) unicellular organisms respire and reproduce.
- Majority of cells cannot be seen directly with our naked eyes because:
(a) organisms are generally unicellular
(b) cells are microscopic
(c) cells are present only inside the body
(d) cells are grouped into tissues
Answer – (b) cells are microscopic
Explanation:
Cells are not visible to the naked eye because they are microscopic (b).
- Read the different combinations of terms given below:
(a) cell wall, cell membrane, nucleus, plastid
(b) cell wall, nucleus, ribosome, chromosome
(c) the cell membrane, mitochondria, ribosome, chromosome
(d) the cell membrane, ribosome, mitochondria, chloroplast.
The correct combination of terms with reference to an animal cell is _____.
Answer – (c) cell membrane, mitochondria, ribosome, chromosome
Explanation:
The correct combination of terms with reference to an animal cell is (c) cell membrane, mitochondria, ribosome, chromosome.
- Which one of the following term is not a part of the nucleus?
(a) ribosome
(c) chromosome
(b) nucleolus
(d) gene
Answer – (a) ribosome
Explanation:
Ribosome (a) is not a part of the nucleus.
- A suitable term for the various components of cells is
(a) tissue
(b) cell organelles
(c) chromosomes
(d) genes
Answer – (b) cell organelles
Explanation:
The suitable term for the various components of cells is (b) cell organelles.
- The jelly-like fluid substance present in cells is called
(a) protoplasm
(b) chromosome
(c) chloroplast
(d) cytoplasm
Answer – (d) cytoplasm
Explanation:
The jelly-like fluid substance present in cells is called (d) cytoplasm.
- Read the following pairs of examples of organisms:
(a) moss and sponge
(b) yeast and Amoeba
(c) bacteria and a blue-green alga
(d) penicillium and Spirogyra
The pair that belongs to the group prokaryotes is_____
Answer – (c) bacteria and a blue-green alga
Explanation:
The pair that belongs to the group prokaryotes is (c) bacteria and a blue-green alga.
- Read the following terms and select the pair that is related to the inheritance of characters.
(a) cell wall and cell membrane
(b) chromosome and mitochondria
(c) chloroplast and cell membrane
(d) chromosome and genes
Answer – (d) chromosome and genes
Explanation:
The pair that is related to the inheritance of characters is (d) chromosome and genes.
- Choose the correct statement:
(a) Genes are located in the chromosomes.
(b) The cell is located in the nucleus.
(c) Chromosomes are located in the nucleolus.
(d) Cell membrane surrounds the nucleus.
Answer – (a) Genes are located in the chromosomes.
Explanation:
The correct statement is (a) Genes are located in the chromosomes.
- The green colour of leaves is due to the presence of the pigment_____
(a) chlorophyll
(b) ribosomes
(c) mitochondria
(d) chloroplast
Answer – (a) chlorophyll
Explanation:
The green colour of leaves is due to the presence of the pigment (a) chlorophyll.
- The unit of measurement used for expressing dimension (size) of cells is:
(a) centimetre
(b) millimetre
(c) micrometre
(d) metre
Answer – (c) micrometre
The unit of measurement used for expressing dimension (size) of cells is (c) micrometre.
- The most important function of the cell membrane is that it:
(a) controls the entry and exit of materials from cells.
(b) controls only the entry of materials into cells.
(c) controls only the exit of materials from cells.
(d) allows entry and exit of materials without any control.
Answer – (a) controls the entry and exit of materials from cells.
Explanation:
The most important function of the cell membrane is that it (a) controls the entry and exit of materials from cells.
- 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
(a) blood cells
(b) skin surface
(c) nerve cells
(d) nucleus of cells
Answer – (c) nerve cells
Explanation:
Paheli felt the sensation of heat and reacted due to the action of (c) nerve cells.
- Which of the following cell organelle is found in all plant cells, animal cells and also in bacterial cells?
(a) chloroplast
(b) cell wall
(c) cell membrane
(d) nucleus
Answer – (c) cell membrane
Explanation:
The cell organelle that is found in all plant cells, animal cells, and also in bacterial cells is (c) cell membrane.
- The thread-like structures present in the nucleus are
(a) nucleolus
(b) chromosomes
(c) genes
(d) ribosomes
Answer – (b) chromosomes
Explanation:
The thread-like structures present in the nucleus are (b) chromosomes.
- Identify the statement which is true for cells.
(a) Cells can be easily seen with naked eyes.
(b) Insect’s egg is not a cell.
(c) A single cell can perform all the functions in a unicellular organism.
(d) The size and shape of cells is uniform in multicellular organisms
Answer – (c) A single cell can perform all the functions in a unicellular organism.
Explanation:
Correct statement for cells is (c) A single cell can perform all the functions in a unicellular organism.
- Which of the following is not a cell?
(a) Red Blood Corpuscle (RBC)
(b) bacterium
(c) spermatozoa
(d) virus
Answer – (d) virus
Explanation:
The cell that is not a living organism is (d) virus.
- Which of the following feature will help you in distinguishing a plant cell from an animal cell?
(a) cell wall
(b) cell membrane
(c) mitochondria
(d) nucleus
Answer – (a) cell wall
Explanation:
The feature that helps in distinguishing a plant cell from an animal cell is (a) cell wall.
- Under a microscope Paheli observes a cell that has a cell wall but no distinct nucleus. The cell that she observes is
(a) a plant cell
(b) an animal cell
(c) a nerve cell
(d) a bacterial cell
Answer – (d) a bacterial cell
Explanation:
The cell that Paheli observes is (d) a bacterial cell.
- Cheek cells do not have _______
(a) cell membrane
(b) nucleus
(c) golgi apparatus
(d) plastids
Answer – (d) plastids
Explanation:
Cheek cells do not have (d) plastids.
- Identify the correct statement.
(a) Tissue is a group of dissimilar cells.
(b) An organ consists of similar cells.
(c) Vacuoles are not found in plant cells.
(d) Prokaryotes do not have a nucleus.
Answer – The correct statement is (d) Prokaryotes do not have a nucleus.
Explanation: Prokaryotes are organisms lacking a true nucleus and cell organelles.
- Which of the following statements are not true for eukaryotic cells?
(i) They do not have a nuclear membrane.
(ii) They have a well-organised nucleus.
(iii) They have a nuclear membrane.
(iv) Blue-green algae are eukaryotic cells
Answer – The incorrect statement is (iv) Blue-green algae are eukaryotic cells.
Explanation:
Blue-green algae are bacteria classified as prokaryotes, making statement (iv) incorrect.
- Identify the correct statement about cells.
(a) All the cells have nucleus.
(b) Cells of an organ have similar structure.
(c) Cells of tissue have a similar structure.
(d) The shape of all types of cells is round.
Answer – The correct statement is (c) Cells of tissue have a similar structure.
Explanation:
Eukaryotic cells possess a well-defined nucleus, making option (a) incorrect. Organ cells vary in structure, making option (b) incorrect. Cells exhibit diverse shapes and sizes, rendering option (d) incorrect.
- The table given below has certain terms and four blank spaces named A, B, C and D.
| Cell | Feature/Part | Function |
| Amoeba | A | Movement |
| Plant cell | Plastid | B |
| C | Spindle Shaped | Contraction |
| Nerve Cell | D | Stimuli and response |
From the options given below choose the correct combination of terms.
(a) A-Pseudopodia; B-Respirations; C-Muscle cell; D-Branched
(b) A-Pseudopodia; B-Photosynthesis; C-Muscle cell; D-Branched
(c) A-Contractile vacuole; B-Photosynthesis; C-Blood cell; D-Spindle shaped
(d) A-Pseudopodia; B-Photosynthesis; C-Cheek cell; D-Spindle shaped
Answer –
Answer is (b) A-Pseudopodia; B-Photosynthesis; C-Muscle cell; D-Branched
Explanation:
- Pseudopodia aid Amoeba in movement and prey capture.
- Plastids in plant cells facilitate photosynthesis.
- Muscle cells are spindle-shaped and involved in contraction.
- Nerve cells are branched and respond to stimuli.
Very Short Answer Questions
- In leaves, name the cell organelle and pigment that is responsible for green colour.
Answer –
Answer is Chloroplast and Chlorophyll
- The instrument used to observe cells is ________
Answer –
Microscope
- We do not sense any pain when we clip our nails or cut our hair. Why?
Answer –
Nails and hairs are made up of dead cells, which are not connected to nerve cells, hence no pain is felt.
- In a cell, where are the genes located?
Answer –
Genes are located in chromosomes within the nucleus.
- Amoeba and Paramecium belong to which category of organisms?
Answer –
Answer is Protozoans
- What are the functions of the cell wall in plant cells?
Answer –
Functions of cell-wall are as follows
- Acts as a protective layer.
- Provides shape to the cell.
- Control the cell expansion
- Preventing water loss from the cell.
- Provides strength and rigidity to the cell.
Short Answer Questions
- Is the following statement correct? If it is wrong, correct the statement Statement :
“Unicellular organisms do not respire, only multicellular organisms respire”
Answer –
The statement is incorrect; all living organisms respire.
- Match the terms given in column I with their functions given in column II and fill the blanks given below the table:
| Column I | Column II |
| A. Chloroplast | i) Carries hereditary characters. |
| B. Cell membrane | ii) Controls the activities of cells. |
| C. Nucleus | iii) Site of photosynthesis. |
| D. Chromosome | iv) Controls the movement of materials into and out of cells. |
Answer –
| Column I | Column II |
| A. Chloroplast | iii) Site of photosynthesis. |
| B. Cell membrane | iv) Controls the movement of materials into and out of cells. |
| C. Nucleus | ii) Controls the activities of cells. |
| D. Chromosome | i) Carries hereditary characters. |
- Observe the following diagram given as Fig. 8.1.
Answer the following questions.
- Does it represent a plant cell or an animal cell?
- Does it represent a prokaryotic cell or a eukaryotic cell?
Answer –
- The figure represents an animal cell.
- This is a eukaryotic cell.
- Label the parts A to E in the given as Fig. 8.2 diagram.
Answer –
- Classify the following terms into cells, tissues and organs and write in the tabular column given below.
RBC, blood vessels, blood, WBC, Nerve cell, muscle, brain, heart, hand, nerve.
Answer –
| Cell | Tissue | Organ |
| RBC | Blood | Blood vessels |
| WBC | Muscle | Brain |
| Nerve Cell | Nerve | Heart |
| Hand |
- Read the following statements and write the appropriate term against each statement.
I control the functions of a cell. Who am I? ……………….
I am like a policeman. I do not allow anything and everything to get in and out of the cell. Who am I? ……………….
I transfer characters from parents to offsprings. Who am I? ……………….
Answer –
A- Nucleus; B-Cell membrane; C-Genes/Chromosomes
- Fill in the blanks with the terms given in the box below:
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).
Answer –
a-cell wall; b-cell membrane; c-cytoplasm; d-cell organelles; e-nucleus; f-chromosomes.
The outermost layer of plant cells is the (a) cell wall beneath which is the (b)cell membrane. The term (c) cytoplasm refers to the jelly-like substance containing all the (d) cell organelles. The (e) nucleus contains thread-like structures called (f) chromosomes.
Long Answer Questions
- Cells consist of many organelles, yet we do not call any of these organelles as a structural and functional unit of living organisms. Explain.
Answer –
Cell organelles have specific functions but cannot act as the sole structural and functional unit of living organisms. The nucleus, being the smallest unit of life, holds this distinction.
- Why do plant cells have an additional layer surrounding the cell membrane? What is this layer known as?
Answer –
Plant cells have a cell wall for protection against environmental factors and to maintain shape. This layer is known as the cell wall.
- The size of the cells of an organism has no relation with the size of its body. Do you agree? Give the reason for your answer.
Answer –
Cell size is not directly related to body size; organelles within cells perform specific functions but cannot be considered the sole unit of life. The nucleus, however, is the fundamental unit of life.
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