Breifly describe the cohesion-tension theory in plants?

  1. Water evaporates from the cells and leaves the plant once the stomata open,

  2. This creates a suction which pulls more water into the leaf

  3. As water is cohesive due to hydrogen bonds, when one molecule moves other tend to follow, the whole column of the xylem moves upwards

  4. Water enters through the roots

BQ

Related Biology A Level answers

All answers ▸

After one molecule of oxygen has bound to Haemoglobin, it is easier for a second molecule of oxygen to bind. Explain Why?


How does Acetylcholine act on a neuronal synapse, and how is it re-uptaken?


Describe the transmission of a nerve impulse across a synapse.


What is natural selection, and how is it related to changes in allele frequency?