Problem 81
Cytoplasmic streaming is easily seen in (a) Leaf of hydrilla (b) Leaf of mango (c) Stem cells of sunflower (d) Pollen grains
Problem 82
Movement of water is correctly represented by (a) Cortex \(\rightarrow\) Root hair (Epidermis) \(\rightarrow\) Xylem \(\rightarrow\) Endodermis \(\rightarrow\) Pericycle (b) Root hair (Epidermis) \(\rightarrow\) Endodermis \(\rightarrow\) Xylem \(\rightarrow\) Pericycle \(\rightarrow\) Cortex (c) Root hair (Epidermis) \(\rightarrow\) Cortex \(\rightarrow\) Endodermis \(\rightarrow\) Pericycle \(\rightarrow\) Xylem (d) Xylem \(\rightarrow\) Cortex \(\rightarrow\) Endodermis \(\rightarrow\) Pericycle \(\rightarrow\) Root hair (Epidermis)
Problem 83
Where is apoplastic movement shifted to symplastic pathway? (a) Cortex (b) Endodermis (c) Pericycle (d) Xylem
Problem 84
Which of the following is true about mycorrhizae? (a) Association between roots and fungus. (b) Fungal hyphae have very large surface area that absorb water and mineral from the soil. (c) Roots provide sugar and \(\mathrm{N}\) -containing compound to the fungus. (d) All the above
Problem 85
Which plant seeds cannot be germinated and established without the presence of mycorrhizae? (a) Mango (b) Pulses (c) Pinus (d) Selaginella
Problem 86
Root pressure develops due to (a) Passive absorption of ions (b) Active absorption of ions (c) Active absorption of glucose (d) None of these
Problem 87
Effect of root pressure is visible (a) At night (b) At early morning (c) When evaporation is low (d) All of these
Problem 88
Guttation is seen in (a) Vein opening near the tip of grass blade (b) Leaves of many herbaceous plant (c) Both (a) and (b) (d) Leaves of trees
Problem 89
Root pressure contributes to the (a) Ascent of sap in small herbaceous plants. (b) Re-establishment of continuous chains of water molecules in the xylem which often breaks down under the enormous tension created by transpiration. (c) Guttation (d) All the above
Problem 90
What is the approximate rate of the ascent of sap? (a) \(5 \mathrm{~m} / \mathrm{hr}\) (b) \(15 \mathrm{~m} / \mathrm{hr}\) (c) \(40 \mathrm{~m} / \mathrm{hr}\) (d) \(2 \mathrm{~m} / \mathrm{hr}\)
