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

When calcium metal is added to water, the gas evolved does not catch fire but the same gas evolved on adding potassium metal to water catches fire. Explain why ?

a. When calcium metal is added to water, the gas evolved does not catch fire but the same gas evolved on adding potassium metal to water catches fire. Explain. b. Name a metal for each case: (i) It displaces hydrogen gas from nitric acid. (ii) It does not react with any physical state of water (iii) It reacts with neither cold nor hot water, but reacts with steam.

Which of the following amphistomatous leaves would dry up last ?

Stems modified into flat green organs performing the functions of leaves are known as

When the entire stem with its all branches become green, flat, fleshy leafy to do photosynthesis and leaves are modified into spines, it is called

a] Plants do not have any nervous system but yet, if we touch a sensitive plant, some observable changes take place in its leaves. Explain how could this plant respond to the external stimuli and how it is communicated. b] Name the hormone that needs to be administered to i] increase the height of a dwarf plant. ii] cause rapid cell division in fruits and seeds.

Stems modlfted into flat green organs performing the functions of leaves are known as

A rocket has been fired upwards to launch a satellite in its orbit . Name the two forces acting on the rocket immidiately after leaving the launching pad.

A metal X is stored under kerosene. When a small piece of it is left open in the air, it catches fire. When the product formed is dissolved in water it turns red litmus blue. a. Name the metal X. b. Write the chemical equation for the rection when it is exposed to air and when the product is dissoolved in water. c. Explain the process by which the metal is obtaned from its molten chloride.