Paper-II
Section A

1 Answer any four of the following in about 150 words each:

What is meant by the term Photoperiodism? Classify plants according to photoperiodic response giving examples of each group 8 10).

Give an illustrated account of ultrastructure and function of chloroplast 5 10).

Describe briefly the external morphology of eukaryotic chromosome. How do they behave during zygotene and diplotene stages of meiosis 4

What are Back cross and Test cross? Explain their significance in plant breeding 6 10).

Mention the structural components of albuminous and exalbuminous dicotyledonous seeds. Briefly discuss the major constraints of quality seed production 6 10).

2 Answer the following in about 150 words each:

Give a concise account of common method employed for breeding a typical cross-pollinated crop for higher yield

How cytoplasmic inheritance differs from chromosomal inheritance? Explain cytoplasmic inheritance with the help of suitable example 5 10).

How can you establish that genes are arranged in linear order on the chromosomes

What are the causes of male sterility? How could it be exploited for varietal improvement programme 7

3 Answer the following in about 150 words each:

Distinguish between C3 and C4 plants. Why are C4 plants considered photosynthetically more efficient 4

Define Respiratory Quotient (R. Q.). With the help of suitable chemical reactions show where R. Q. Will be 1 and 1 8 10).

Explain the theories of ascent of sap. How can you prove that translocation of sap takes place through xylem tissue 3 10).

State how IAA can be distinguished from GA3 by their specific action on higher plants. Describe the role of ISA in Agriculture 6 10).

4 Write short notes on: (10 10 10 10 40)

CAM metabolism

beta-oxidation of fat

Storage of potato tuber

Vernalisation

Section B

5 Answer any four of the following in about 150 words each:

What do you understand by biological control? How can you aim at biological control to check rice pests under Indian situation 7

What type of mouth parts does a boring insect have? How can knowledge of mouth parts be helpful in chemical control of insects 7

Why have thiocarbamate fungicides gained popularity in recent years? What are the modes of action of thiocarbamate fungicides 7

What is a citrus canker? What are the symptoms observed? How can you control the disease 3 5

e What are the advantages of cutting over the seeded plant in mango cultivation? How can you control

Mango mealy bug

Red ant in mango orchard 3 3

6 Answer the following in about 150 words each:

Describe the climate and soil requirement of tea, cotton and cashew

Write in brief, the processing of Black tea

Give a general account of storage and preservation of mushroom, mango and cabbage. What are their export potential 4

Compare the nutritive values of rice, wheat and pea. Name four high-yielding varieties of each of them commonly cultivated in India 4 10).

7 Answer the following in about 150 words each:

Describe the common pests and diseases of brinjal. Suggest plant protection measures to control these pests and diseases 6 10).

What are pheromones? Which pheromones appear to be more effective in the control of insects? How can pheromones be used for the suppression of insect 2 7

Name the causal organism of powdery mildew of cucurbits. Describe the symptoms and suitable methods to control the disease 9 10).

Name important stored grain pests of rice and pea. Discuss methods to control these pests 8 10).

8 Write short notes on (10 10 10 10 40)

Micropropagation

Organomercurial fungicides

Intersex in Papaya

Mulching