1. Which of the following is correct about vacoule?
a) Vacuole contain water sap, excretory product and other material not useful for the cell .
b) In plant cell the vacuole can occupy up to 90 per cent of the volume of the cell.
c) The vacuole is bounded by tonoplast.
d) All of these
Explanation: All of these
2. Tonoplast membrane is important for
a) Transporting ions along concentration gradient.
b) Transporting ions against concentration gradient.
c) Providing rigidity to structure
d) All of these
Explanation: Tonoplast membrane is important for transporting ions against concentration gradient
3. The contractile vacuole present in amoeba is useful for
a) Ingestion
b) Locomotion
c) Both (a) and (b)
d) Excretion
Explanation: Excretion
4. The amount or number of mitochondria in a cell depends on
a) Anatomical structure of cell
b) Size of the cell
c) Colour and contour of the cell
d) Physiological activity of cell
Explanation: The amount or number of mitochondria in a cell depends on physiological activity of cell
5. What is the main function of cristae?
a) To hold the vesicles formed
b) Increase the surface area
c) Increase the density of organelle
d) All of these
Explanation: Increase the surface area
6. What kind of ribosome is seen in mitochondria?
a) 80S
b) 70S
c) Both (a) and (b)
d) None of these
Explanation: 70S
7. How is a new mitochondria formed by the pre-existing ones?
a) Mitosis
b) Fission
c) Conjugation
d) Budding
Explanation: Fission
8. What does a chloroplast contain?
a) Chlorophyll
b) Carotenoid
c) Both (a) and (b)
d) Anthocyanin
Explanation: Both (a) and (b)
9. Select the incorrect pair from the following:
a) Leucoplast-Carotene
b) Amyloplast-Starch
c) Elaioplast-Oils
d) Aleuroplasts–Proteins
Explanation: "Leucoplast-Carotene". This is incorrect
10. In 30S and 40S ribosomes, ‘S’ stands for
a) Sub-unit
b) Svedberg’s unit
c) Single unit
d) Size
Explanation: Svedberg’s unit