Paper-II
Section A

Distinguish between any four of the following: (Each answer may be in about 150 words) (10 × 4 40)

Active and Passive transport across cell membrane

Radiation and Chemical mutagenesis

Sympatric and Allopatric speciations

Missence and Nonsense mutations

Mitochondria and Chloroplasts

Explain in details with suitable diagrams, the process of meiotic cell division with reference to a cell within 2N 4. Give biological significance of meiosis

What is an operon? Explain the structure and regulation of the lactose operon

Write notes on the following: (10 × 4 40)

Haldane-Oparin hypothesis on origin of life

Evolution of elephant

Five kingdom classification and its basis

Hardy-Weinberg law-its proof and applications

Section B

Distinguish between any four of the following (each answer may be in about 140 words): (10 × 4 40)

Glycolysis and Citric acid cycle

Digestion in stomach and in intestine

Blastula of frog and of chick

Metamorphosis in insect and in frog

Starch and Glycogen

What are enzymes? Explain their characteristics. Give the basis of their classification with appropriate example of eachclass

Explain the terms ‘resting’ and ‘action’ potentials. Describe how a nerve impulse travels along a neuron mentioning roles of different ion channels and gates

With suitable examples discuss the role of cytoplasm and nucleus in the process of early embryonic development