CBSE Class-9 The Fundamental Unit Of Life: Cell / Biology MCQ Questions

MCQ questions on Biology Class-9 (Answers Are Given Below)

1. The undefined nuclear region of prokaryotes
   is also known as
   (a) nucleus
   (b) nucleolus
   (c) nucleic acid
   (d) nucleoid
2. The only cell organelle seen in prokaryotic
   cell
   (a) mitochondria
   (b) ribosomes
   (c) plastids
   (d) lysosomes
3. Cell theory was given by
   (a) Schleiden and Schwann
   (b) Virchow
   (c) Hooke
   (d) Haeckel
4. Cell arise from pre-existing cell was stated by
   (a) Haeckel
   (b) Virchow
   (c) Hooke
   (d) Schleiden
5. Kitchen of the cell is
   (a) mitochondrion (b) chloroplast
   (c) endoplasmic reticulum
   (d) Golgi apparatus
6. Organelle without a cell membrane is
   (a) ribosome
   (b) nucleus
   (c) mitochondrion (d) chloroplast
7. Which of the following are covered by a single
   membrane ?
   (a) mitochondria
   (b) vacuole
   (c) nucleus
   (d) plastid
8. Lipid molecules in the cell are synthesized by
   (a) smooth endoplasmic reticulum
   (b) rough endoplasmic reticulum
   (C) Golgi apparatus
   (d) plastids
9. The proteins and lipids, essential for building
   the cell membrane, are manufactured by
   (a) endoplasmic reticulum
   (b) Golgi apparatus
   (c) mitochondria
   (d) peroxisomes
10. Lysosomes arise from
    (a) endoplasmic reticulum
    (b) Golgi apparatus
    (c) nucleus
    (d) mitochondria
11. Amoeba acquires its food through a process
    termed as
    (a) exocytosis
    (b) endocytosis
    (c) plasmolysis
    (d) exocytosis and endocytosis both
12. Which cell organelle plays a crucial role in
    detoxifying many poisons and drugs in a cell?
    (a) Golgi apparatus
    (b) lysosmes
    (c) smooth endoplasmic reticulum
    (d) vacuoles
13. Chromosomes are made up of
    (a) DNA
    (b) protein
    (c) DNA and protein
    (d) RNA
14. Organelle other than nucleus, containing DNA is
    (a) endoplasmic reticulum
    (b) mitochondria
    (C) Golgi apparatus
    (d) lysosome
15. Find out the false statement
    (a) Golgi apparatus is involved with the
    formation of lysosomes
    (b) nucleus, mitochondria and plastid have
    DNA, hence they are able to make their own
    structural proteins
    (c) mitochondria is said to be the power house
    of the cell as ATP is generated in them
    (d) cytoplasm is called as protoplasm
16. Cell wall of which one of these is not made
    up of cellulose ?
    (a) bacteria
    (b) Hydrilla
    (C) mango tree
    (d) cactus
17. A cell will swell up if
    (a) the concentration of water molecules in the cell is higher than the concentration of water molecules in surrounding medium
    (b) the concentration of water molecules in surrounding medium is higher than water molecules concentration in the cell
    (c) the concentration of water molecules is same
    in the cell and in the surrounding medium
    (d) concentration of water molecules does not matter
18. Plasmolysis in a plant cell is defined as
    (a) break down (lysis) of plasma membrane in hypotonic medium
    (b) shrinkage of cytoplasm in hypertonic medium
    (c) shrinkage of nucleoplasm
    (d) none of them
19. Which of these is not related to endoplasmic
    reticulum ?
    (a) it behaves as transport channel for proteins between nucleus and cytoplasm
    (b) it transports materials between various regions in cytoplasm
    (c) it can be the site of energy generation
    (d) it can be the site for some biochemical activities of the cell
20. Select the odd one out
    (a) the movement of water across a semipermeable membrane is affected by the amount of substances dissolved in it.
    (b) membranes are made of organic molecules
    such as proteins and lipids.
    (c) molecules soluble in organic solvents can easily pass through the membrane.
    (d) plasma membranes contain chitin sugar in plants.
21. Following are a few definitions of osmosis.
    Read carefully and select the correct definition.
    (a) movement of water molecules from a region of higher concentration to a region of lower concentration through a semipermeable membrane.
    (b) movement of solvent molecules from its higher concentration to lower concentration
    (c) movement of solvent molecules from higher concentration to lower concentration of solution through permeable memberane.
    (d) movement of solute molecules from lower concentration to higher concentration of solution through a semipermeable membrane.

Answer:

1. (d);
2. (b);
3. (a);
4. (b);
5. (b);
6. (a);
7. (b);
8. (a);
9. (a);
10. (b);
11. (b);
12. (c);
13. (C);
14. (b);
15. (d);
16. (c);
17. (b);
18. (b);
19. (c);
20. (d);
21. (a).