Cbse class 10 previous year question paper science

 

1. Name the term for transport of food from leave to other part of plant.

Solution – Translocation of food 

2. What is lymph? Write its important function?

Lymph is an extra cellular fluid in our body which help in transportation.

Lymph carries digested and absorbed fat from intestine and drains excess fluid from extra cellular space back into the blood.

3. State the vital function of kidney.

   Kidney is the basic functional unit of our body it help in excretion. Nitrogenous waste such as urea or uric acid are removed from blood in the kidneys.

4. Name the procedure used in working of artificial kidney?

Solution – dialysis

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5. Draw the diagram of cross-section of leaf and level the following in it?

1. chloroplast

2. Guard cell

3. Lower epidermis

4. upper epidermis

6. Write the stage of photosynthesis

(i) Absorption of light energy by chlorophyll.

(ii) Conversion of light energy to chemical energy  and splitting of water molecules into hydrogen  and oxygen.

(iii) Reduction of carbon dioxide to carbohydrates.

      Desert plants take up carbon dioxide at night and prepare an intermediate which is acted upon by the energy absorbed by the chlorophyll during the day.