1. Dense clusters of tiny hair like structures of roots are extensions of
A. Epidermal cells of roots
B. Mesodermal cells
C. Mesophyl cells
D. Endodermal cells
2. According to an estimation root hairs provide _____of total surface area provided by roots.
A. 27%
B. 37%
C. 57%
D. 67%
3. Maximum depth of roots of leguminous tree is
A. 10 meter
B. 20 meter
C. 40 meter
D. 50 meter
4. The rate of absorption of minerals by roots depends on
A. Its concentration in and outside the root
B. Ease in passive penetrance in cell membrane
C. Extent of involvement of carrier molecules and active absorption
D. All
5. Ions moving in apoplast can reach to ______ only, further progress is prevented by _______
A. Endodermis, casperian strips
B. Casperian strips, endodermis
C. Cortex, endodermis
D. Endodermis, cortex
6. The passive transport of minerals follow which of the following path
A. Cortex-endodermis-pericycle-xylem cell
B. Endodermis-cortex-pericycle-xylem cell
C. Pericycle-endodermis-cortex-xylem cell
D. Xylem cell- pericycle- cortex- endodermis
7. Most of ions are taken up by roots through
A. Diffusion
B. Osmosis
C. Active transport
D. All
8. The active transport of minerals through root is ______and is ______on respiration
A. Selective, dependent
B. Selective, independent
C. Non selective, dependent
D. Non selective, independent
9. Fungi facilitate uptake of
A. Phosphorus
B. Zinc
C. Copper
D. All
10. _____% of flowering plants have Mycorrhizae
A. 30%
B. 50%
C. 70%
D. 90%
11. ______is of greatest importance for water as well as solutes movement across a root
A. Apoplast pathway
B. Symplast pathway
C. Vacuolar pathway
D. C3 pathway
12. Movement of water ion across a root along vacuolar pathway is
A. Of greatest importance
B. Less important
C. Important
D. Negligible
13. _______is the system of interconnected protoplasts in root cells.
A. Apoplast pathway
B. Symplast pathway
C. Vacuolar pathway
D. C3 pathway
14. Pure water has _____water potential
A. Maximum
B. Minimum
C. -1200
D. -800
15. All solutions have ______water potential than pure water so have ____value of water potential at defined temperature and atmospheric pressure.
A. Lower, negative
B. Higher, negative
C. Lower, positive
D. Higher, positive
16. Solute potential is always
A. 0
B. 1
C. Negative
D. Positive
17. If pressure more than atmospheric pressure is applied to a solution or pure water, their water potential
A. Increases
B. Decreases
C. Remain same
D. Decreases severely
18. When a living cell placed in a solution having water potential lower than the cell , the cell will
A. Burst
B. turgid
C. Plasmolysed
D. Have no change
19. Full turgidity is achieved when cell is placed in
A. Sugary water
B. Salty water
C. Sea water
D. Pure water
20. Incipient plasmolysis is the point at which
A. Plasmolysis completes
B. Deplasmolysis completes
C. Plasmolysis is just about to happen
D. DePlasmolysis is just about to happens