COMBINED COMPETITIVE EXAMINATION (MAIN)
BOTANY
Paper-I
Time 3 hours Full Marks 200
Note: Thefigures in the right-hand margin indicatefull marksfor the questions.

Attempt five questions in all.


Question No. 1 is compulsory.


1. Distinguish between the following 2x10=20

Bacteria and Viruses


Bacteria and Cyanobacteria


Homospory and Heterospory

Pollinia of Asclepiadaceae and Orchidaceae


Xylem and Phloem


Colony and Plaque


Flower and Inflorescence
(viii) Bacteriophages and Plasmids

Genus and Species


Cymose and Racemose


Choose the correct option: 2x5=10

Plastids are absent in

1.
Cyanophyta

2.
Chlorophyta

3.
Rhodophyta

4.
Phaeophyta




Which of the following has prokaryotic cells?


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l. Nostoc

2.
Ulothrix

3.
Sargassum

4.
Spirogyra



Penicillin is produced by

1.
Aspergillus

2.
Albugo



3.
Penicillium

4.
Spirulina



The common term for Anthocerotaceae is

1.
stonewort

2.
liverwort

3.
thornwort

4.
hornwort




Juvenile stage of Funaria gametophyte is

1.
sarconema

2.
protonema

3.
peristome

4.
apospore




Explain any five of the following 2x5=lO

Apogamy


Polyembryony


Differences between homospory and heterospory

Role of embryology in classification of angiosperms


Fermentation


Sporocarp of Marsilea


Secondary growth in Pinus stem
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2. Answer any eight questions from the following 5x8=40

Give an account of the application of algae in industry.


Mention the indirect uses of bryophytes.


Write a note on the evolution of sporophyte in bryophytes.


Describe the range of thallus in algae.


Comment on fungal toxins.


Write a note on the salient features of Cordaitales.


Explain the tunica corpus theory.


Give an account of pollen grain morphology and the application of palynology.


Explain the floral structure and primitive characters of Magnoliaceae.


Explain the term 'binomial nomenclature'.


3.
Answer any five of the following: 8x5=40

4.
Answer any four of the following lOx4=40


Write on the gametophytic generations of Gnetum.


Discuss seed habit in pteridophytes giving suitable examples.


What are biosensors? Describe the applications of microbiology in industry.




Describe the types of ascocarps in Ascomycotina and illustrate how they help in classification.
Discuss the angiosperms. role of numerical taxonomy In systematics of
Write a detailed note on floral structure and floral formula of Poace ae.
Give the salient classification. features of Bentham and Hooker system of
Discuss the role of classification of algae. pigm.entation and reserved food in the
the mode of sexual reproduction in yeast.

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.,.

(dj With the help of suitable diagrams, describe the structure and arrangement of sex organs in bryophytes.
(ej Write on the structure of flower and fruit in Leguminosae.
5. Answer any two of the following 20x2=40 (aj What is heterotrichous habit in algae? Discuss its role in the evolution ofterrestrial habit. (bj Ovule-bearing organ of Pinus is a highly reduced shoot in the axil of
bract. Discuss.
(cj Write a note on somatic hybrids.


6.
Explain any two of the following 20x2=40 (aj Blight disease of potato (bj Tikka disease of groundnut (cj Rust disease of wheat

7.
Answer the following questions 20+10+10=40 (aj What is biodiversity? Describe in situ and ex situ methods for

conservation of biodiversity. (bj Write an explanatory note on the advanced characters ofAsteraceae. (cj Write a detailed note on the structure of pollen wall.

8.
What IS double fertilization? With sketch diagrams, illustrate post-fertilization changes within the ovule of a dicot. 10+30=40

9.
Answer the following 20x2=40 (aj Describe the ultrastructure and role of heterocyst in blue-green algae. (bj Discuss that mesosomes are artifacts and not true structures.


10. What are mycorrhizae? Describe the economic potential of mycorrhizal fungi in agriculture and forestry. 10+30=40

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