Cell: Structural and Functional Unit Class 8 Quiz Question with Answer
Cell: Structural and Functional Unit Class 8 Quiz Question with Answer. CBSE Class 8 Science Lesson 8 Mock Test.
1) The term cell was coined by which of the following scientist?
a) Robert Hooke
b) Robert brown
c) Cuvier
d) Weismann
Solution: [A] Robert Hooke
Explanation: the term cell was coined by Robert Hooke from the thin slice of cork in 1660.
2) Plant cell differ from animal cell in the absence of?
a) Ribosomes
b) Mitochondria
c) E.R
d) Centriols
Solution: [D] Centriols
Explanation: animal cells possess centrioles whereas plant cells lack centrioles. These centrioles are involved in cell division; hence, plant cells differ from animal cells in the absence of centrioles.
3) Eukaryotic cell differ from prokaryotic cell in having which of the following?
a) Ribosomes
b) ER
c) True nucleus
d) cytoplasm
Solution: [C] True nucleus
Explanation: Eukaryotic cells have true nucleus and have membrane bound organelles, prokaryotic do not have hence the correct option is C.
4) Every living cell has ¬____________.
a) Cell walls
b) Chloroplast
c) Membrane
d) Food vacuole
Solution: [C] Membrane
Explanation: every living cell has membrane that regulates not only what enters the cell but also how much of any given substance comes in.
5) Prokaryotic cell lacks in which of the following?
A) Nuclear membrane
B) Nucleus
C) Membrane bound organelles
D) All of the above.
Solution: [B] Nucleus
Explanation: prokaryotic cell lacks a nucleus; the absence of nucleus differentiates prokaryotes from another class of organisms called eukaryotes,
6) Plasma membrane is?
A) Impermeable
B) Selectively barrier
C) Non-selectively permeable
D) None of these
Solution: [B] Selectively barrier
Explanation: plasma membrane acts as a selective barrier between the inside and outside of the cell and controls the exchange of materials between cytoplasm and the surrounding liquid.
7) Nucleus is separated from cytoplasm by nuclear membrane which is?
A) Single
B) Nonporous
C) Single nonporous
D) double porous
Solution: [D] double porous
Explanation: nuclear membrane is double porous and allows almost the movement of material between the cytoplasm and the inside of the nucleus.
8) Cell wall is?
A) Permeable
B) Semipermeable
C) Selectively permeable
D) impermeable
Solution: [C] Selectively permeable
Explanation: the cell wall is selectively permeable and allows almost all kinds of nutrients inside the cell like water, nutrients etc, it is a rigid wall that protects the cell whenever needed, hence answer is [C].
9) Which are the following are the characters of the cell?
A) All living things are composed of one or more cell
B) Cell are the basic unit structure and function in an organisms
C) Cell comes only from the replication of existing cells.
D) All of the above.
Solution: [D] All of the above
Explanation: here all are the characteristics of a cell. Hence, the answer will be option [D].
10) What is the approx number of cell in human body?
A) Billions
B) Trillion
C) Both (A) and (B)
D) None of the above
Solution: [B] Trillion
Explanation: the human body has trillions of cells which vary in shapes and sizes. dissimilar groups of cells execute multiple functions.
11) Organisms made of more than one cell are called?
A) Unicellular
B) Multicellular
C) A cellular
D) All of the above
Solution: [B] Multicellular
Explanation: organisms made of more than one cell are called multicellular while singled celled organism are called unicellular hence, option [B] is the solution
12) Which of the following is a single cell organism?
A) Amoeba
B) Plant
C) Human
D) animal
Solution [A] Amoeba
Explanation: amoeba is made up of only one cell that carries out all of the functions needed by the organisms. While plants, humans and animals are made up of more than one called, hence they are multicellular. Hence amoeba is single celled organism.
13) The shape of Amoeba is _____________.
A) Spherical
B) Irregular
C) Spindle shaped
D) None of these
Solution [B] Irregular
Explanation: amoeba has irregular shaped, in fact, amoeba has no definite shape, therefore it keeps on changing its shape due to the absence of cell membrane hence answer will be [B]
14) The shape of nucleus is ____________
A) Irregular
B) Spherical
C) Spindle shaped
D) All of these
Solution: [B] Spherical
Explanation: the shape of the nucleus is spherically situated in the nucleus hence [B] is correct. Hence, the correct option is [B].
15) The example of prokaryotic cells?
A) Blue-green algae
B) Bacteria
C) Mycoplasma
D) All of these
Solution: [D] All of these
Explanation: all are examples of prokaryotic cells because in all of these organisms lack both, a well- defined nucleus and membrane bound cell organism, so all are the example of prokaryotic cells.
16) Which is the example of eukaryotic cells?
A) Plant
B) Animals
C) Both (A) and (B)
D) cyanobacteria
Solution: [C] Both (A) and (B)
Explanation: both plant and animals are eukaryotic organism because they have well-defined nucleus while cyanobacteria is a prokaryotic cell hence, correct option is [C]
17) The Smallest unit of life is _____________.
A) Chloroplast
B) Cell
C) Nucleus
D) mitochondria
Solution: [B] Cell
Explanation: The cell is the smallest unit of life because the organ is a group of tissue and tissue is a group of cells hence, the cell is the smallest unit of life.