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Ncert Exemplar Solutions Class 8 Science Cell Structure and Functions
Welcome to NCTB Solutions. Here with this post we are going to help 8th class students for the Solutions of NCERT Exemplar Class 8 Science Book, Unit 8, Cell Structure and Functions. Here students can easily find step by step solutions of all the problems for Cell Structure and Functions, Also here our Science teacher’s are solved all the questions with easily understandable language with proper guidance so that all the students can understand easily.
Cell Structure and Functions all Question Solutions :
Multiple Choice Questions :
Question no – (1)
Choose the correct statement with respect to unicellular organisms:
Answer :
Correct option – (c)
The correct statement is – unicellular organisms respire and reproduce.
Question no – (2)
Majority of cells cannot be seen directly with our naked eyes because
Answer :
Correct option – (b)
Majority of cells cannot be seen directly with our naked eyes because cells are microscopic.
Question no – (3)
Read the different combinations of terms given below
Answer :
Correct option – (c)
The correct combination of terms with reference to an animal cell is → cell membrane, mitochondria, ribosome, chromosome.
Question no – (4)
Which one of the following term is not a part of the nucleus?
Answer :
Correct option – (a)
Ribosome is not a part of the nucleus.
Question no – (5)
A suitable term for the various components of cells is
Answer :
Correct option – (b)
A suitable term for the various components of cells is Cell organelles.
Question no – (6)
The jelly-like fluid substance present in cells is called
Answer :
Correct option – (d)
The jelly-like fluid substance present in cells is called Cytoplasm.
Question no – (7)
Read the following pairs of examples of organisms
Answer :
Correct option – (c)
The pair that belongs to the group prokaryotes is Bacteria and blue-green alga.
Question no – (8)
Read the following terms and select the pair that is related to inheritance of characters
Answer :
Correct option – (d)
Chromosome and genes is related to inheritance of characters.
Question no – (9)
Choose the correct statement
Answer :
Correct option – (a)
The correct statement – Genes are located in the chromosomes.
Question no – (10)
Green colour of leaves is due to presence of the pigment
Answer :
Correct option – (a)
Green colour of leaves is due to presence of the pigment Chlorophyll.
Question no – (11)
The unit of measurement used for expressing dimension (size) of cells is
Answer :
Correct option – (c)
The unit of measurement used for expressing dimension (size) of cells is Micrometer.
Question no – (12)
The most important function of cell membrane is that it
Answer :
Correct option – (a)
The most important function of cell membrane is that it controls the entry and exit of materials from cells.
Question no – (13)
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
Answer :
Correct option – (c)
She felt the sensation of heat and reacted due to the action of Nerve cells.
Question no – (14)
Of the following parts of a cell listed below, name the part that is common to plant cell, animal cell and a bacterial cell.
Answer :
Correct option – (c)
Cell membrane is a common part to plant cell, animal cell and a bacterial cell.
Question no – (15)
The thread-like structures present in the nucleus are
Answer :
Correct option – (b)
The thread-like structures present in the nucleus are Chromosomes.
Question no – (16)
Identify the statement which is true for cells.
Answer :
Correct option – (c)
A single cell can perform all the functions in a unicellular organism.
This statement is True.
Question no – (17)
Which of the following is not a cell?
Answer :
Correct option – (d)
Virus is not a cell.
Question no – (18)
Which of the following feature will help you in distinguishing a plant cell from an animal cell?
Answer :
Correct option – (a)
Cell wall will help in distinguishing a plant cell from an animal cell.
Question no – (19)
Under a microscope Paheli observes a cell that has a cell wall but no distinct nucleus. The cell that she observes is
Answer :
Correct option – (d)
The cell that she observes is a bacterial cell.
Question no – (20)
Cheek cells do not have ____.
Answer :
Correct option – (d)
Cheek cells do not have Plastids.
Question no – (21)
Identify the correct statement.
Answer :
Correct option – (d)
The correct statement – Prokaryotes do not have nucleus.
Question no – (22)
Which of the following statements are true for eukaryotic cells?
Answer :
Correct option – (b)
True for eukaryotic cells –
(ii) They have a well organised nucleus.
(iii) They have a nuclear membrane.
Question no – (23)
Identify the correct statement about cells.
Answer :
Correct option – (c)
Correct about cells – Cells of a tissue have similar structure.
Question no – (24)
The table given below has certain terms and four blank spaces named A, B, C and D
Answer :
Correct option – (b)
(A) → Pseudopodia.
(B) → Photosynthesis.
(C) → Muscle cell.
(D) → Branched.
Very Short Answer Questions :
Question no – (25)
Answer :
The plastids in plant cell contains a green pigment called Chlorophyll that gives a plant green color.
Question no – (26)
Answer :
The instrument used to observe cells is a Microscope.
Question no – (27)
Answer :
As both our nails and hairs are composed of dead cells and as they do not have any nerves in them which are responsible for pain we don’t feel pain when cut our hairs or clip our nails.
Question no – (28)
Answer :
A cell contains nucleus which have nucleolus inside it and this nucleolus contains chromosomes which in turn contains the genes.
Question no – (29)
Answer :
Amoeba or Paramecium are unicellular organisms as they are made up of only one cell.
Question no – (30)
Answer :
A cell wall in a plant cell provides protection to a plant from changes in temperature, high wind speed, atmospheric moisture etc.
Short Answer Questions :
Question no – (31)
Answer :
No, the statement is False.
Correction – Both unicellular and multicellular organisms respire.
Question no – (32)
Answer :
(A) → (iii) site of photosynthesis
(B) → (iv) controls the movement of materials into and out of cells.
(C) → (ii) controls the activities of cells
(D) → (i) carries hereditary characters
Question no – (34)
Answer :
(a) → Cell wall.
(b) → Cell membrane.
(c) → Nucleus.
(d) → Cytoplasm.
(e) → Vacuole.
Question no – (35)
Answer :
| Cell : | Tissue : | Organ : |
| RBC | Blood | Blood vessels |
| WBC | Muscle | Heart |
| Nerve cell | Nerve | Hand |
| Brain |
Question no – (36)
Answer :
(A) I control the functions of a cell. Who am I?
= Here I am Nucleus,
(B) I am like a policeman. I do not allow anything and everything to get in and out of the cell. Who am I?
= Here I am Cell membrane
(C) I transfer characters from parents to offsprings. Who am I?
= Here I am Genes or Chromosomes.
Question no – (37)
Answer :
The outermost layer of plant cells is the cell wall beneath which is the cell membrane. The term cytoplasm refers to the jelly-like substance containing all the cell organelles. The nucleus contains thread-like structures called chromosomes.
Long Answer Questions :
Question no – (38)
Answer :
A cell consists of many cell organelles such as nucleus , vacuoles and mitochondria. This organelles have a definite structure and function yet we still don’t cell them the structural and functional unit of a living organisms because all of these organelles are functional only when they are in the cell and works together. A cell organelle alone could not provide structure or function that is being provided by a cell.
Question no – (39)
Answer :
Plants have this additional layer surrounding the cell membrane that is known as cell wall. This cell wall is present in plant cells because of the reason as they can’t move from one place to other they need protection against the changes in conditions such as temperature, humidity and wind speed. So this cell wall protects them from the unpredictable conditions.
Question no – (40)
Answer :
Yes, I agree with it. The size of a cell in no way depends upon the size of the animal. Be it elephant, horse, human or rat it is not necessary that one of them will have a larger cell. The size of a cell depends on the function it performs such as the nerve cell in both rat and humans are long and branched as they both have the same work to transfer messages.
Other Chapter Solutions :
👉 Crop Production and Management
👉 Microorganisms : Friend and Foe
👉 Synthetic Fibres and Plastics
👉 Materials : Metals and Non-Metals
👉 Conservation of Plants and Animals
👉 Reaching the Age of Adolescence
👉 Force
👉 Friction
👉 Sound
👉 Chemical Effects of Electric Current
👉 Light
