SECTION-A
8x5=40
biotechnology and its scope and' significance in agriculture and
industrial revolutions.

1. Answer the following in about 150 words each
Define biotechnology and its scope and significance in agriculture and
industrial revolutions.
150 words each 8
(b)Describe various types of changes in chromosome numbers in plants.
(c)What are gibberellins? Discuss their role in the life cycle of a plant.
(d)Differentiate between Breeder's seed and Nucleus seed. Describe the specific
method adopted for the maintenance of purity of seed. 8
(e)Discuss critically the plant virus-vector relationship in relation to transmission of plant virus diseases with suitable examples. 8
10x4=40
2.
Distinguish between the following
(a)Growth and Development in plants 10
(b)Gametogenesis and Sporogenesis 10
Photosynthesis and Photorespiration along with their chemical reactions 10
(d)Natural selection and Artificial selection of plants 10
1Qx4=40
3. answer the following
What are genes? How are the classical and modern concepts of genes different? Discuss. 10
(b).Discuss male sterility. Enlist various types of male sterility found in plants and describe briefly about cytoplasmic genetic male sterility. 10

Describe the process of senescence and the. factors responsible for it.
(d).Enumerate briefly the role of public and private sect0rs in seed production 10
4.Write short notes on the following in about 200 words each:
(a)Post-harvest changes in fruits and vegetable products 10
Insect viruses in the management of lepidopteran insects 10
Red rust of tea, its causal agent, diagnostic symptoms, mode of spread and
management 10
NEPO and NETU viruses and their differences 10
SECTION-B
5.Answer the following in about 150 words each
(a)What is a balance diet? Discuss the importance of pulses and vegetables in
human nutrition. 8
Briefly discuss the package of practices for the commercial production of papaya.
Enlist five important diseases of banana. Discuss the nature of damages
caused and their integrated management.8
What do you understand by asexual method of propagation? Discuss briefly
the advantages and disadvantages of asexual propagation. 8
Blister blight of tea is a serious problem in the tea plantation of Darjeeling
6. suitable reasons for the following statements and support your answer with
suitable examples 1 Qx4=40
Why is it important to identify the pests and its nature of damages before
implementing management practices? 10
Potato tubers become green and bitter in taste, when exposed to sunlight during cultivation. 10
Products of cutting and grafting are genetically uniform in plants. 10
Quick and low temperature freezing is not recommended in case of fresh
tomatoes. 10
7. Answer the following IOx440
Discuss the soil and climatic requirements, varieties of seed tuber, sowing time, manure and fertilizer application and insect-pests management of commercial cultivation of potato. I 0
Explain the production technology for commercial cultivation of marigold and gladiolus. 10
What is the role of pheromone for the control of insect-pests? Discuss. 10
Define plant quarantine. Why the potato tubers grown in Darjeeling district of West Bengal cannot be transported to the other States of India for seed purposes? 10

8.Write short notes on the following
Classification of herbicides on the basis of their chemical nature
Global warming potential of greenhouse gases in agriculture
Landscape gardening in India and their future scope for tourists attraction I 0
ELISA method application to determine the pesticide residues and its advantages and disadvantages 10