...... percent of the water reaching the leaves is used in photosynthesis and plant growth.

Identify the cells in the given figure.

Water moves up against gravity and even for a tree of $20 \,m$ height, the tip receives water within two hours. The most important physiological phenomenon which is responsible for the upward movement of water is $...........$

Conversion of starch to organic acid is essential for

Which one of the following will reduce the rate of transpiration?

Stomatal movement is not affected by