The movement of water through the root layers is ultimately:
1. apoplastic along the walls | 2. active transport by porins |
3. symplastic in the endodermis | 4. symplastic in the xylem |
In the mycorrhizal symbiotic relationship, the root provides the fungus with:
1. Water | 2. Phosphorus |
3. N – containing compounds | 4. Sodium and potassium |
Mycorrhiza is a symbiotic association of fungus with root system which helps in:
A. Absorption of water | B. Mineral nutrition |
C. Translocation | D. Gaseous exchange |
1. Only A | 2. Only B |
3. Both A and B | 4. Both B and C |
Unloading of mineral ions occurs at the fine vein endings through:
1. diffusion and, are passively taken up by the sink cells
2. active transport and, are passively taken up by the sink cells
3. diffusion and, are actively taken up by the sink cells
4. active transport and, are actively taken up by the sink cells
An analysis of xylem exudates will show that most of the nitrogen is carried as:
1. Inorganic ions
2. Ammonia dissolved in water
3. Dinitrogen
4. Organic compounds such as amino acids