PRACTICE CBSE BIOLOGY

CBSE BIOLOGY

CLASS XII

SECTION-A

1.         What is gene pool?

2.         Name the scientist whose work influenced Darwin.

3.         Who disproved the theory of spontaneous generation?

4.         What is modern Biotechnology?

5.         What is meant by elution?

SECTION-B

6.         What is a palindrome in a DNA? Give an example.

7.         Explain the origin of universe. How old is the universe?

8.         What are two core technologies that enabled the birth of modern biotechnology?

SECTION-C

9.         State the principle underlying gel electrophoresis and mention two applications of this technique in Biotechnology.

10.     Draw a diagram of the experimental set up used by Miller and Urey in their experiment to prove chemical origin of life and also explain the experiment.

11.     What are restriction enzymes? Name and define their two types.

SECTION -D

12.     a) Trace out the various components of human evolution.

b) Differentiate between convergent and divergent evolution.

CBSE BIOLOGY

CLASS XI

SECTION-A

1.         Why are erythrocytes able to carry out anaerobic metabolism only?

2.         Which disease is caused on inhaling excessive cigarette smoke?

3.         Write the chemical reaction catalysed by zinc-enzyme, carbonic anhydrase

4.         What are chylomicrons?

5.         Name the bile pigments.

SECTION-B

6.         How are following enzymes activated in the alimentary canal-

a) Pepsin

b) Renin

c) Trypsin

d) Chemotrypsin

7.         Write a short note on occupational lung disease?

8.         What is tidal volume? Find out the tidal volume for a healthy human.

SECTION-C

9.         Describe the histological structure of alimentary canal.

10.     State the role of pancreatic juice in the digestion of proteins

11.     How is oxygen transported in the blood and released in the tissue?

SECTION -D

12.     a) Describe briefly the disorders of digestive system

b) What would happen if HCL were not secreted in the stomach?