Answer: D) 320 m Explanation: Relative speed = (72 - 36) x 5/18 = 2 x 5 = 10 mps.Distance covered in 32 sec = 32 x 10 = 320 m. The length of the faster train = 320 m.

(A) Flowers

Anthophobia is the fear of flowers. People with this phobia may experience anxiety, panic attacks, or other symptoms when they are in the presence of flowers or even just thinking about them. Phobias are irrational fears that can cause significant distress, and they often require psychological or therapeutic intervention for management.

Answer: A) Air pollution Explanation: 1. Lichens are plants that grow in exposed places such as rocks or tree bark.   2.  Lichens are widely used as environmental indicators or bio-indicators. They can be used as air pollution indicators, especially of the concentration of sulfur-di-oxide in the atmosphere.     3. They need to be very good at absorbing water and nutrients to grow there.