Question

Give reasons for the following. 1. Deforestation is one of the causes of global warming. 2. Burning is a chemical change. 3. Nitrogen is an essential nutrient for all the organisms. 4. Photosynthesis and respiration in plants are different processes. 5. Air is a mixture, not a compound. 6. Smoke is harmful.​

Answer 1

Answer:-

Ans 1}:-

The trees of tropical forests, like all green plants, take up carbon dioxide from the atmosphere and release oxygen during photosynthesis. ... When forests are cut down, much of that stored carbon is released into the atmosphere again as CO2. This is how deforestation and forest degradation contribute to global warming.

Ans 2}:-

The process of burning (as opposed to evaporating) is a chemical reaction, a chemical change. The wax molecules are undergoing a chemical change; they are changing into different molecules by reacting with a substance in the air.

Ans 3}:-

Nitrogen is essential for all living things because it is a major part of amino acids, which are the building blocks of proteins and of nucleic acids such as DNA, which transfers genetic information to subsequent generations of organisms. ... A process called the nitrogen cycle makes this happen.

Ans 4}:-

During daytime, photosynthesis produces oxygen and glucose faster than respiration consumes it. Photosynthesis also uses carbon dioxide faster than respiration produces it. Oxygen surplus is released into the air and unused glucose stored in the plant for later use.

Ans 5}:-

Air is a mixture and not a compound because: Air does not have a formula like a mixture, while compounds have a fixed formula. When air is formed by gases, there is no energy change.

Ans 6}:-

Chemicals in tobacco smoke increase the chance of heart problems and cardiovascular diseases. Smoking causes atherosclerosis, which is when plaque builds up in the blood and sticks to the artery walls. This makes them narrower, reducing blood flow and increasing the risk of blood clots.

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