Give a schematic diagram to show absorption of water through root hairs.

If one hold his breath after expiration for about 30 sec., would there still be occurring any exchange of respiratory gases in the lung during this period? Explain.

Name the water and minerals conducting element of non-flowering plants. Mention how conduction takes place in it.

Differentiate between ureter and urethra.

Distinguish between photosynthesis and respiration.