BOTANY

Paper-II
ITime Allowed: Three Hours I IMaximum Marks 200 I
INSTRUCTIONS
Candidates should attempt Question Nos. 1 and 5
which are compulsory, and THREE of the
remaining questions, selecting at least
ONE question from each Section.

The number of marks carried by each question is
indicated at the end of the question.

Answers must be written in ENGLISH.

Suitable diagrams may be drawn wherever required.

Section-A
1. Write short notes on any four of the following in about 150 words each: lOx4=40
Eukaryote DNA packaging
Signal transduction
Particle bombardment
Heterosis
Chi-square test

2. Give an account of the morphology, structure and function of endoplasmic reticulum. 20
Explain the molecular basis, regulation and significance of cell cycle. 20

3. Describe the genetic basis of sex determination in plants and animals. 20

Describe the role of ribosomes in initiation, elongation and termination of protein synthesis. 20

4. Describe different types of molecular markers and their use in plant breeding. 20

Explain different techniques for gene transfer in plants. 20

Section-B

5. Write short notes on any four of the following in about 150 words each 10x4=40

Active ion uptake

Oxidative phosphorylation

Heat-shock proteins

Kranz anatomy

Electron transport chain


6. What is a C4 plant? Compare C3 and C4 plants, giving suitable examples. 20
Describe the photoperiodic classification and control of flowering in plants by light. 20
7. Explain biosynthesis and physiological effects of gibberellins in plants. 20
What is seed dormancy? Mention its biological significance. Explain the role of the seed coat and hormones in dormancy regulation. 20
8. Give an account of different types of forests in India. 20
What are the factors that cause soil pollution? Discuss their control by phytoremediation. 20