Ethanol can be dehydrated to give ethene and di ethyl ether by heating it with an excess of concentrated sulphuric acid at 170 and 140...

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Write one function of each of the following enzymes: (a) Pepsin (b) Lipase Answer - (a) Pepsin helps in breaking down or digestion of...

What substances are contained in the gastric juice? What are their functions? Answer - Gastric juice contains three substances:...

Why does absorption of digested food occur mainly in the small intestine? Answer - Maximum absorption occurs in small intestine because...

What are the adaptations of leaf for photosynthesis? Answer - (i) Leaves provide large surface area for maximum light absorption. (ii)...

Why is blood circulation in human heart called double circulation? [NCERT Exemplar] Answer - The blood circulation in human heart is...

Name the correct substrates for the following enzymes. (a) Trypsin (b) Amylase (c) Pepsin (d) Lipase Answer - (i) (a) Protein (b) Starch...

What happens to the rate of breathing during vigorous exercise and why? Answer - During vigorous exercise, our body requires more energy...

Define dark reaction. Ans - A chemical reaction, which can take place even in the absence of light, is called a dark reaction or light...

How do the guard cells regulate opening and closing of stomatal pores? Answer - The swelling of guard cells due to absorption of water...

What happens to glucose which enters the nephron along with the filtrate? Ans - Glucose along with filtrate runs down through the long...

State the function of Bowman's capsule and glomerulus. Answer - Bowman's capsule and glomerulus have semipermeable walls. The glomerulus,...

State the function of epiglottis. Ans - At the top of the trachea (or wind pipe) there is a flap of cartilage called epiglottis. The...

Name the membrane covering the lungs. Ans - Pleura

What is root pressure? [CBSE 2019] Answer - It is a pressure developed in the xylem due to metabolic activity of the root cells. It is a...

(i) What is compensation point? (ii) "All plants give out oxygen during day and carbon dioxide during night. Do you agree with this...

What is ascent of sap? Answer - Absorbed water from the soil also contains dissolved minerals (nitrates, phosphates, etc.) and hence it...