Question

1.name the process by which autotrophs prepare their own food ? 2.list three events which occur during this process ? 3.state two sources from which plants obtain nitrogen for the synthesis of protein and other compounds?

Answer 1

1. Photosynthesis
2. Absorption of light energy by chlorophyll -- Conversion of absorbed light energy to chemical energy and formation of molecular oxygen and hydrogen from water -- Reduction of absorbed carbon-dioxide to form glucose later stored as starch(carbohydrate)
3. Atmospheric nitrogen which is made available into simple nitrogen atoms by lightning and high-energy solar radiation splitting the molecular nitrogen into two simple atoms and  Nitrogen present in the soil as a result of nitrogen fixation by various microorganisms.

Answer 2

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