IAS Mains Botany Paper 2015

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Section –A

Q.1 Briefly describe the following in not more than 150 words each :

(a) Role of microbes in soil nutrient cycling

(b) Algae as bioindicators

(c) Concept of Progymnosperms

(d) Chemical nature of viroids and their transmission in plants

(e) Evolution of sexual reproduction in fungi


(a) Describe the range of vegetative structures with suitable diagrams in volvocales and their phylogenetic relationship.

(b) Describe the disease symptoms, causal organism and the control measures of the loose smut of wheat.

(c) Draw well labelled diagram of the L.S. of Anthoceros sporophyte. Discuss the evolutionary significance of Anthoceros also.


(a) Draw well labelled diagram of the L.S. of Teletosorus of Pucinia and give a brief description of the same.

(b) Describe the symptoms, causal organism and the control measures of white rust of crucifers.

(c) Discuss the distribution of living Gymnosperms in India and their economic importance.


(a) Give the name of the causal organism, disease symptoms and disease control measures of the following :

Red rot of sugarcane and

Late blight of potato

(b) Give an account of sexual fruiting bodies in Ascomycetes.

(c) Describe the method of vegetative reproduction in Bryophytes.

Section –B

Q.5 Describe the following in about 150 words each :

(a) Mycotoxins

(b) Concept of totipotency in higher plants

(c) Dye yielding plants

(d) Ethnobotanical knowledge and beliefs in species conservation

(e) Use of somaclonal variations in crop improvement


(a) Write an account of the following with respect to floral structures. Give the botanical names of three important plant species belonging to each of the botanical names of three important plant species belongning to each of the families and specify their uses :

Ranunculaceae and


(b) Discuss the components of a full-fledged Botanical garden.

(c) Give an account of micropropagation and its utility towards ex-situ conservation of rare and endangered plants.


(a) Describe the oil yielding plants of India and their economic importance.

(b) Distinguish the Androecium of Malvaceae, Asteraceae and Asclepiadaceae from each other.

(c) “Somatic hybrids can be characterized by a variety of methods.” Substantiate the above statement.

(d) Compare the floral characters of the family Solanaceae and Malvaceae.


(a) Give an account of Vavilov’s “Centres of Origin” of the cultivated plants.

(b) Describe the method of production of Androgenic haploids.

(c) Describe the anomalous secondary growth in monocots with suitable diagram.


Section –A

Q.1 Explain the following :

(a) Mitochondria

(b) Extrinsic and Intrinsic proteins

(c) Genetic code

(d) Hybrid vigour

(e) Self-incompatibility.


(a) Distinguish between prokaryotic and eukaryotic cell.

(b) Discuss briefly the evidence of organic evolution.

(c) Describe briefly the various methods of gene transfer.


(a) Describe the structure, behavior and significance of special types of chromosomes.

(b) What is the role of RNA in the origin and evolution of living organisms ?

(c) Describe the method of developing disease and insect resistant varieties through back cross method of breeding crop varieties.


(a) Describe the numerical variation in chromosomes.

(b) What is the biochemical and molecular basis of mutations ?

(c) Discuss briefly the mechanism of disease resistance.

Section –B

Q.5 Explain the following :

(a) ATP synthase

(b) Senescence

(c) Conservation of biodiversity

(d) Species based mechanism of invasion

(e) Mainstream forms of renewable energy.


(a) Describe the process of biological nitrogen fixation with special emphasis on denitrogenase.

(b) Discuss the principal systems of environmental pollution and the reasons thereof.

(c) Describe different sub-mitochondrial complexes associated with electron transport chain of aerobic respiration.


(a) Enumerate the salient features of water relations in crop plants.

(b) What are the characteristics of phytochrome induced responses in flowering of higher plant ? How do they control flowering ?

(c) Distinguish between natural and social forests . Discuss in detail the various objectives of social forestry.


(a) Describe the mechanism of fixation in CAM plants.

(b) Describe any four principal phytogeographical regions of India.

(c) Discuss the various advantages and limitations of phytoremediation.

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