In plants, which two substances does the xylem carry primarily?
Which of the following is not a consequence of the transpiration stream in plants?
An increased rate of photosynthesis
Supply of mineral ions to plant tissues
Which row of the table best summarises the interaction of water molecules during water uptake by a plant?
| |
Water molecules pulling each other up |
Water molecules sticking to the xylem walls |
Capillary action |
| A. |
cohesion |
adhesion |
adhesion |
| B. |
cohesion |
cohesion |
adhesion |
| C. |
adhesion |
adhesion |
cohesion |
| D. |
cohesion |
cohesion |
cohesion |
Which of the following is not a water-saving adaptation found in xerophytic plants?
High density of chloroplasts
Which row of the table gives the best summary of the conditions in which mineral ions are taken up by plant roots?
| |
Osmolarity in soil |
Osmolarity in root hair cell cytoplasm |
Transport mechanism |
| A. |
Low |
High |
Water channels across membrane |
| B. |
High |
Low |
Transporter proteins |
| C. |
High |
High |
Via membrane bilayer |
| D. |
Low |
High |
Transporter proteins |
