Paper-II
Section A

Answer any four of the following in about 150 words each

Define heritability. Mention its laws and their significance in plant breeding.

Explain hybrid vigour and its exploitation in crops

Differentiate between pure line selection and recurrent selection.

Give a physiological importance of diffusion and osmosis.

Classify plant diseases.

Answer the following questions

Define cytoplasmic inheritance, combining ability, biotype, pest and forecasting.

How a method of plant breeding differs with a breeding technique?

Do the climatic requirements and the cultural practices of crop production carry the same meaning or differ with one another? Explain in brief 5 10).

Give the procurement and processing constraints of food grains.

Write short notes on the following in about 150 words each (10 ×

Chromosomal abberations

Control measures of diseases of food grains during storage

Raising of oranamental flower crops

Importance of package of practices for cultivation of vegetable crops.

Answer the following questions

Give time of sowing and harvesting time, seed rate and yield per hectare of crops namely wheat, cotton, potato, brinjal and carrot × 5 20).

Mention time of planting, number of plants required to plant one hectare, fertilizer quantity per plant and fruit yield/hectare of guava, papaya, grapes and mango × 5 20).

Section B

Describe any four of the following in about 150 words each

Mode of action of pesticides

Cultivation and export significance of Chrysanthemum .

How evolution takes place in nature? Give its significance.

Describe factors responsible for poor seed germination and methods to improve germination.

Why back cross method of breeding is used for incorporating disease resistance in plants? How will you transfer resistance when the resistance controlling gene is recessive 6

Write short notes on any four of the following in 150 words each

Methods of breaking seed dormancy

Meiosis

Male sterility

Plant propagation of fruit crops

Overcoming weather hazards to avoid crop damage.

Distinguish between the two in 150 words each

Certified and registered seed.

Sex linked and sex influenced characters.

Inter-specific and inter-genetic hybridisation.

Sexual and asexual reproduction.

Comment on any four of the following in about 150 words each

A multi-line variety compared to a pure line variety can resist disease spread better but it lacks purity of seed.

Auxins and hormones play important role in plant development and growth.

Processed fruits and flower products fetch higher gains than the unprocessed ones, provided quality standards are maintained.

Agriculture is a gamble in the dark.

High yielding crop varieties boosted food grain production besides saving foreign exchange.