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 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.
Answer 1 (c)
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 2 (b)
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.
The correct combination of terms with reference to an animal cell is _____.
Answer 3 (c)
Which one of the following term is not a part of the nucleus?
(a) ribosome (c) chromosome
(b) nucleolus (d) gene
Answer 4 (a)
A suitable term for the various components of cells is
(a)tissue (c) chromosomes
(b)cell organelles (d) genes
Answer 5 (b)
The jelly-like fluid substance present in cells is called
(a)protoplasm (c) chloroplast
(b) chromosome (d) cytoplasm
Answer 6 (d)
Read the following pairs of examples of organisms:
(a) moss and sponge (c) bacteria and blue-green alga
(b) yeast and Amoeba (d) penicillium and Spirogyra
The pair that belongs to the group prokaryotes is_____
Answer 7 (c)
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
Answer 8 (d)
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.
Answer 9 (a)
Green colour of leaves is due to presence of the pigment_____
(a) chlorophyll (c) mitochondira
(b) ribosomes (d) chloroplast
Answer 10 (a)
The unit of measurement used for expressing dimension (size) of cells is:
(a) centimetre (c) micrometer
(b) millimetre (d) metre
Answer 11 (c)
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.
Answer 12 (a)
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 (c) nerve cells
(b) skin surface (d) nucleus of cells
Answer 13 (c)
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 (c) cell membrane
(b) cell wall (d) nucleus
Answer 14 (c)
The thread-like structures present in the nucleus are
(a) nucleolus (c) genes
(b) chromosomes (d) ribosomes
Answer 15 (b)
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 16 (c)
Which of the following is not a cell?
(a) Red Blood Corpuscle (RBC)
Answer 17 (d)
Which of the following feature will help you in distinguishing a plant cell from an animal cell?
(a) cell wall (c) mitochondria
(b) cell membrane (d) nucleus
Answer 18 (a)
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 (c) a nerve cell
(b) an animal cell (d) a bacterial cell
Answer 19 (d)
Cheek cells do not have _______
(a) cell membrane (c) golgi apparatus
(b) nucleus (d) plastids
Answer 20 (d)
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.
Answer 21 (d)
Which of the following statements are true for eukaryotic cells?
(a) ii and iv (b) ii and iii
(c) i and ii (d) i and iv
Answer 22 (b)
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.
Answer 23 (c)
The table given below has certain terms and four blank spaces named A, B, C and 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 24 (b)
VERY SHORT ANSWER QUESTIONS
In leaves, name the cell organelle and pigment that is responsible for green colour.
Chloroplast and chlorophyll
The instrument used to observe cells is ________
We do not sense any pain when we clip our nails or cut our hair. Why?
Nails and hair are both made up of dead cells. They do not have nerve cells. Hence we don’t feel the pain when they are cut.
In a cell, where are the genes located?
Amoeba and Paramecium belong to which category of organisms?
Unicellular and Eukaryotic/Protozoan.
What are the functions of cell wall in plant cells?
Cell wall protects the cell contents, gives shape 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"
No, the statement is wrong.
Both unicellular and multicellular organisms respire/all 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-______
B. Cell membrane
(i) Carries hereditary characters
(ii) Controls the activities of cells
(iii) Site of photosynthesis
(iv) Controls the movement of materials into and out of cells
Ans. A-iii, B-iv; C-ii; D-i
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- Nucleus; B-Cell membrane; C-Genes/Chromosomes
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) .
a-cell wall; b-cell membrane; c-cytoplasm; d-cell organelles; e-nucleus; f-chromosomes.
LONG ANSWER QUESTIONS
Cells consist of many organelles, yet we do not call any of these organelles as structural and functional unit of living organisms. Explain.
Although cell organelles have specific structures and perform specific functions but they cannot be called structural and functional units of living organisms. This is so because they can perform their functions only when they are within a living cell. They cannot function outside the cell as an independent unit.
Why do plant cells have an additional layer surrounding the cell membrane? What is this layer known as?
As plants cannot move they need protection against variations in temperature, high wind speed, atmospheric moisture, etc. Therefore, for protection plant cell membrane. This layer is called the cell wall. Plant cells have an additional layer surrounding the cell membrane.
The size of the cells of an organism has no relation with the size of its body. Do you agree? Give reason for your answer.