Question

plzz provide me all the short or long important question of chapter life processes

Answer 1

days hydrogen and Helium Lithium beryllium Boron carbon everywhere nitrogen also they with oxygen so you can be than fluorine for your free kidney and to light up the science sodium for salty time magnesium and phosphorus and sulphur chlorine and organ potassium calcium so you request on scandium Titanium vitamin, MN this is the periodic table noble gases table halogen

Answer 2

1.What are enzymes? Name any one enzyme of our digestive system and write its function.
Answer. Enzymes are biological catalysts. Catalysts are proteins that increase the rate of chemical reactions
without being used up. For example: Amylase catalyses the breakdown of starch into sugars in the mouth and small intestine


2.(i) Write the balanced chemical equation for the process of photosynthesis,
(ii) When do the desert plants take up carbon dioxide and perform photosynthesis ?
Answer.
(i) Photosynthesis can be represented using a chemical equation. The overall balanced equation is

(ii) Desert plants open up their stomata during night and take in CO2. Stomata remains close during the day time to prevent the loss of water by i transpiration. They store the CO2 in their cells until the sun comes out and they can carry on with photosynthesis during the day time.


3.In single celled organisms diffusion is sufficient to meet all their requirements of food, exchange of gases or removal of wastes but it is not in case of multicellular organisms. Explain the reason for this difference.
Answer. Unicellular organisms can absorb sufficient oxygen because of its complete contact with the atmosphere, but in multicellular organisms the rate of absorption and diffusion becomes very less because all cells are not in direct contact with the atmosphere. Multicellular organisms require greater amount of oxygen to sustain life processes which cannot be fulfilled by the process of diffusion.

4..Name the acid presents in the following:
(i) Tomato (ii) Vinegar (iii) Tamarind
Answer.
(i) Oxalic acid (ii) citric acid (iii) Tartaric acid

5.Why do herbivores have longer, small intestine than carnivores ?
Answer.Digestion of cellulose takes a longer time. Hence, herbivores eating grass need a longer small intestine to allow complete digestion of cellulose. Carnivorous animals cannot digest cellulose due to the absence of enzyme CELLULASE, hence they have a shorter intestine.

6.Write correct sequence of four steps of method for the preparation of temporary mount of a stained leaf peel.
Answer.

Take a healthy leaf from the potted plant.

Remove a part of the peel from the lower surface of the leaf. You can do this by folding the leaf over and gently pulling the peel apart using forceps. Keeps the peel in a watch glass containing water

Put a few drops of safranin stain in a watch glass.

After 2-3 minutes take out the peel and place it on a clean glass slide.

Put a drop of glycerin over the peel and place a clean covers lip gently over it with the help of a needle.

Remove the excess stain and glycerin with the help of blotting paper.

 Observe the slide under magnifications of the compound microscope



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