It is difficult to burn a heap of green leaves, but dry leaves catch flre easily. Explain.

Leaves of the same plant as well as the leaves of different plants show different shades of green. Name the pigments reponsible for the colour of leaves.

Pragya tested the solubility of three different substances at different temperatures - and collected the data as given below (results are given in thefollowing table, as grams of substance dissolved in 100 grams of water to form a saturated solution). Pragya makes a saturated solution of potassium chloride in water at 353 K and leaves the solution to cool at room temperature. What would she observe as the solution cools? Explain.

Look at leaves of the same plant on the shady side and compare it with the leaves on the sunny side. Or, compare the potted plants kept in the sunlight with those in the shade. Which of them has leaves that are darker green? Why?

When a, bullet leave a gun, the gun presses on the shoulder of the person firing the gun. Explain why.

Explain why some of the leaves may get detached from a tree if we vigorously shake its branch.

Where does cyclic Photophosphorylation take place in leaves? Explain the events in sequence. Why is this process called cyclic?