Cell Structure and Functions - Exemplar Solutions 1
NCERT Exemplar Solutions
CHAPTER 8
Cell – Structure and Functions
MULTIPLE CHOICE QUESTIONS
1. Choose the correct statement with respect to unicellular organisms:
(a) In unicellular organisms, tissues work in co-ordination to perform different functions.
(b) Unicellular organisms do not require food.
(c) Unicellular organisms respire and reproduce.
(d) All unicellular organisms move by cilia.
(b) Unicellular organisms do not require food.
(c) Unicellular organisms respire and reproduce.
(d) All unicellular organisms move by cilia.
Ans. (c) Unicellular organisms perform all the necessary functions as a multicellular organism does. Like multicellular organisms, unicellular ones respire, captures and digests food, excretes, grows and reproduces.
2. 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
(b) Cells are microscopic
(c) Cells are present only inside the body
(d) Cells are grouped into tissues
Ans. (b) Cells are microscopic in size and are not visible to the unaided eye. They need to be enlarged or magnified by a microscope.
3. Read the different combinations of terms given below:
(a) Cell wall, cell membrane, nucleus, plastid
(b) Cell wall, nucleus, ribosome, chromosome
(c) Cell membrane, mitochondria, ribosome, chromosome
(d) Cell membrane, ribosome, mitochondria, chloroplast.
(b) Cell wall, nucleus, ribosome, chromosome
(c) Cell membrane, mitochondria, ribosome, chromosome
(d) Cell membrane, ribosome, mitochondria, chloroplast.
The correct combination of terms with reference to an animal cell is _____.
Ans. (c) Animal cell possess cell membrane, mitochondria, ribosome, chromosome. Cell wall, plastids, chloroplast are present in plant cells.
4. Which one of the following term is not a part of the nucleus?
(a) Ribosome
(b) Nucleolus
(c) Chromosome
(d) Gene
(b) Nucleolus
(c) Chromosome
(d) Gene
Ans. (a) Ribosome is a cell organelle present in the jelly like substance called cytoplasm of the cell.
5. A suitable term for the various components of cells is
(a) Tissue
(b) Cell organelles
(c) Chromosomes
(d) Genes
(b) Cell organelles
(c) Chromosomes
(d) Genes
Ans. (b) cell organelles is the term used for various components of cell which are mainly mitochondria, golgi bodies, ribosome, etc.
6. The jelly-like fluid substance present in cells is called
(a) Protoplasm
(b) Chromosome
(c) Chloroplast
(d) Cytoplasm
(b) Chromosome
(c) Chloroplast
(d) Cytoplasm
Ans. (d) A jelly like substance present in the cell is called cytoplasm.
7. Read the following pairs of examples of organisms:
(a) Moss and Sponge
(b) Yeast and Amoeba
(c) Bacteria and Blue-green alga
(d) Penicillium and Spirogyra
(b) Yeast and Amoeba
(c) Bacteria and Blue-green alga
(d) Penicillium and Spirogyra
The pair that belongs to the group prokaryotes is_____
Ans. (c) The nucleus is both of them is unorganized. They do not have nucleus membrane and hence they are prokaryotes. (pro:primitive; karyon nucleus)
8. Read the following terms and select the pair that is related to inheritance of characters.
(a) Cell wall and cell membrane
(b) Chromosome and mitochondria
(c) Chloroplast and cell membrane
(d) Chromosome and genes
(b) Chromosome and mitochondria
(c) Chloroplast and cell membrane
(d) Chromosome and genes
Ans. (d) The inheritance or transfer of characters from the parents to the offspring is because of genes. The chromosomes can be seen when the cell divides.
9. Choose the correct statement:
(a) Genes are located in the chromosomes.
(b) Cell is located in the nucleus.
(c) Chromosomes are located in the nucleolus.
(d) Cell membrane surrounds the nucleus.
(b) Cell is located in the nucleus.
(c) Chromosomes are located in the nucleolus.
(d) Cell membrane surrounds the nucleus.
Ans. (a) Nucleus contain thread like structure called chromosomes which carry genes.
10. Green colour of leaves is due to presence of the pigment_____
(a) Chlorophyll
(b) Ribosomes
(c) Mitochondira
(d) Chloroplast
(b) Ribosomes
(c) Mitochondira
(d) Chloroplast
Ans. (a) Green colour of leaves is due to the presence of plastids in plant cell. They contain green pigment called chlorophyll.
11. The unit of measurement used for expressing dimension (size) of cells is:
(a) Centimeter
(b) Millimeter
(c) Micrometer
(d) Metre
(b) Millimeter
(c) Micrometer
(d) Metre
Ans. (c) The size of cell is expressed in micrometer. It is as small as millionth of metre.
12. The most important function of 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.
(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.
Ans. (a) The cell membrane present in a cell separates the cell from another and from the surrounding medium. This plasma membrane being porous allows the movement of substance inward and outward of the cell.
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
(a) Blood cells
(b) Skin surface
(c) Nerve cells
(d) Nucleus of cells
(b) Skin surface
(c) Nerve cells
(d) Nucleus of cells
Ans. (c) The nerve cell receives or transfer message thereby helping to control the working of different part of the body.
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.
(a) Chloroplast
(b) Cell wall
(c) Cell membrane
(d) Nucleus
(b) Cell wall
(c) Cell membrane
(d) Nucleus
Ans. (c) The cell membrane is present in all of these cells.
15. The thread-like structures present in the nucleus are
(a) Nucleolus
(b) Chromosomes
(c) Genes
(d) Ribosomes
(b) Chromosomes
(c) Genes
(d) Ribosomes
Ans. (b) The thread-like structure present in the nucleus are called chromosomes. These carry genes, when are unit of inheritance in living organisms.
16. 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
(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
Ans. (c) A single cell can perform all the functions in a unicellular organism. It captures and digests food, respires, excretes, grows and reproduces as in amoeba.
17. Which of the following is not a cell?
(a) Red Blood Corpuscle (RBC)
(b) Bacterium
(c) Spermatozoa
(d) Virus
(b) Bacterium
(c) Spermatozoa
(d) Virus
Ans. (d) Virus is note a cell. It is a microorganism.
18. Which of the following featureS will help you in distinguishing a plant cell from an animal cell?
(a) Cell wall
(b) Cell membrane
(c) Mitochondria
(d) Nucleus
(b) Cell membrane
(c) Mitochondria
(d) Nucleus
Ans. (a) Cell wall is an additional layer required by plants for protection.
19. 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
(b) An animal cell
(c) A nerve cell
(d) A bacterial cell
Ans. (d) The nucleus of the bacterial cell is not well-organised like the cells of multicellular organisms.
20. Cheek cells do not have _______
(a) Cell membrane
(b) Nucleus
(c) Golgi apparatus
(d) Plastids
(b) Nucleus
(c) Golgi apparatus
(d) Plastids
Ans. (d) Cheek cell is an animal cell and does not contain plastids. They are present only is plants cells.
21. 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 nucleus.
(b) An organ consists of similar cells.
(c) Vacuoles are not found in plant cells.
(d) Prokaryotes do not have nucleus.
Ans. (d) Prokaryotes are cells having nuclear material without nuclear membrane. For Example: bacteria and blue-green algae.
22. Which of the following statements are 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.
(ii) They have a well organised nucleus.
(iii) They have a nuclear membrane.
(iv) Blue green algae are eukaryotic cells.
(a) ii and iv (b) ii and iii (c) i and ii (d) i and iv
Ans. (b) Eukaryotic cells have well-organised nucleus with a nuclear membrance (eu: true; Karyon: nucleus)
23. Identify the correct statement about cells.
(a) All the cells have nucleus.
(b) Cells of an organ have similar structure.
(c) Cells of a tissue have similar structure.
(d) Shape of all types of cells is round.
(b) Cells of an organ have similar structure.
(c) Cells of a tissue have similar structure.
(d) Shape of all types of cells is round.
Ans. (c) Tissue refers to a group of similar cells performing certain specific functions.
24. 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.
(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
(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
Ans. (b) A-Pseudopodia; B-Photosynthesis; C-Muscle cell; D-Branched
