IAS Mains Botany Papers 1990
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IAS Mains Botany 1990
Paper-I
Section A
- Answer any three of the following question. Answer to parts (b) (c) , and (d) should not exceed 200 words for each:
- Write briefly about the following:
- A vascular land plant more primitive than rhynia
- A plant disease beneficial to man
- An edible alga grown commercially by sea-farming
- A bacterium commercially exploited for antibacterial drug production.
- A carnivores fungus.
- Distinguish between ‘virus’ and ‘viroids’ with suitable examples.
- What are monoclonal antibodies? How are they produced? Mention their importance.
- What are Target-specific fungicides? Name three such fungicides and mention their modes of action.
- Write briefly about the following:
- Answer the following questions
- Comment on any two of the following:
- Generalized and specific transduction
- Evidene of role of pectin hydrolase՚s and transeliminases in plant disease development
- Post-infectional biochemical defence mechanism in plants.
- Name the causal agent, primary inoculum and its source, two characteristic symptom expressions, secondary inoculum and specific control measures used by the farmers for the following plant diseases:
- Downy mildew of Bajra
- Rust of Coffee
- Bacterial wiet of Potato
- Sandal spike
- Ear-cockle of Wheat.
- Comment on any two of the following:
- Answer the following questions
- Describe the morphology and anatomy of the corn of Isoetes. Trace the origin of the taxon from arborescent lycopods.
- Describe the sporophyte morphology of Azolla with special reference to its argonomic use as a bio-fertilizer.
- Answer the following questions
- Comment on any Three of the following:
- Triphasic life-cycle in algae
- Ballistospores and mechanism of their discharge
- Differences between sexual and parasexual recombination
- Similarities and dissimilarities between photo-synthetic systems of blue-green and green algae
- Attempt any two to the following:
- State the distinguishing features of saprophytes of Sphagnidae, Andreacidae, and Bryidae with sketches and examples
- Control of oil pollution of sea-water by microbes
- Economic, medicinal and ecological importance՚s of bryophytes of man.
- Comment on any Three of the following:
Section B
- Answer any three of the following questions:
- Write briefly about the following:
- An angiosperm with open carpel
- A herbaceous gymnosperm
- A saprophytic angiosperm
- A dicotyledonous with C4 pathway
- A monocot with secondary growth
- Comment on the floral structure, relationships, and economic importance of Ephedra.
- Distinguish between the cellular and helobial endosperm development with sketches and examples.
- What are somatic hybrids? How are they produced? Mention their importance to manking with suitable examples.
- Write briefly about the following:
- Answer the following questions
- Enumerate the families of Conferrals giving characteristic features, distribution and an Indian examples of each of them.
- What is numerical taxonomy? Briefly state the methods employed in and importance of this taxonomy.
- Answer the following questions
- Answer any two of the following:
- Outline the salient features of the classification by Bentham and Hooker. What are the merits and demerits of this system?
- Briefly comment on the origin of angiosperms.
- Importance of the study of photochemistry in taxonomy.
- Answer the below questions
- State the distinguishing characters of Rosaceous and the affinities of the taxon with Rannunculaceae and Leguminous. Mention five India fruit plants of the family.
- Describe the shoot apex organization of angiosperms in the light of recent researches.
- Answer any two of the following:
- Answer the following questions
- Place the following genera to their respective families and indicate their economic importance:
- Elaeis
- Manihot
- Arachis
- Cephaelis
- Nigella
- Distinguish between:
- Cereals and millets
- Omithophily and chiropteriphily
- utricularia and Aldrovanda
- Plasmodesmata and Ectodesnata
- Sorosis and Syconus.
- Place the following genera to their respective families and indicate their economic importance:
Paper-II
Section A
- Answer any three of the following in not more than 200 words each:
- What are peroxisomes and glyoxysomes? Present brief account of their functions in the light of modern work.
- Define epitasis. Explain the Patten of interactions involved with a suitable example.
- Briefly describe the cloning of eukaryotic genes in E. Coil.
- Discuss the structure and importance of polygene chromosome in the study of gene regulation.
- Answer the following questions
- Write a short account on male sterility and its significance in plant breeding.
- Mention the condition required to maintain the hardy-Weinberg equilibrium over several generations. How does the equilibrium get altered by a charge in these conditions?
- Give the characteristics that a substance must possess to be a hereditary carrier. Discuss the role of genetic code in eukaryotic protein synthesis.
- Answer any two of the following:
- Explain gene evolution by mutation through duplication.
- Discuss the significance of cytoplasm inheritance and its importance in hybridization.
- Present critical evidences for the concept of organic evolution.
Section B
- Answer any three of the following in not more than 200 words each:
- What is photo system II? Discuss the structure and function.
- Describe mitochondrial electron transport chain and its relation of oxidative phosphorylation.
- Give the modern concept of the mechanism of stomata opening and closure.
- Discuss the hormonal control of seed dormancy and germination.
- What is C4 photosynthesis? In what groups of plants does this occur? Explain its high efficiency with special reference to productivity.
- Answer any two of the following:
- Forest types of India
- The role of micronutrient elements in plant nutrition with particular reference to zinc and manganese.
- Action of phytahrome in the physiology of flowering.
- Answer the following questions
- Write briefly about the conservation of ecosystems.
- Give complete botanical names of the following plants, the family to which they belong, the morphological nature of the parts yielding the economic products and their uses:
- Jute
- Saffron
- Teak
- Rubber
- discuss in brief the major centers of origin of cultivated plants in the world with particular references to origing of wheat.