BOT/III/03 Student's Copy
2 0 1 8
Pre-CBCS
3rd Semester
BOTANY
THIRD PAPER
Plant Physiology, Biochemistry and Ecology
Full Marks 55
Time 2½ hours
PART A—OBJECTIVE
Marks 20
The figures in the margin indicate full marks for the questions
SECTION—A
Marks 5
Tick the correct answer in the brackets provided 1×5=5
1. The first product of C4 pathway is
oxaloacetic acid
RuBP
PGA
PGAL
/223 1 Contd.
2. TCA cycle occurs in
chloroplast
cytoplasm
Golgi bodies
mitochondria
3. Which one of the following hastens the ripening of fruits?
Cytokinins
Gibberellins
Ethylene
Auxin
4. RNA primer grows in
5¢-3¢ direction
3¢-5¢ direction
5¢-6¢ direction
3¢-4¢ direction
5. One species benefited, the other one is neither benefited nor harmed is
termed as
competition
commensalism
predation
mutualism
BOT/III/03/223 2 Contd.
SECTION—B
Marks 15
Write short notes on the following 3×5=15
1. Deficiency-symptoms of nitrogen
2. Nitrification
3. Vernalization
4. Translation
5. Food chain
PART B—DESCRIPTIVE
Marks 35
The figures in the margin indicate full marks for the questions
Answer the following questions
1. Describe the mechanism of absorption of water in higher plants. 7
OR
Write short notes on the following 3½+3½=7
CAM
Photorespiration
2. What is glycolysis? Give a brief account of the process of glycolysis.
OR
Write short notes on the following 3½+3½=7
Oxidative phosphorylation
Structure of mitochondria
BOT/III/03/223 3 Contd.
3. Give an account of plant growth hormones and mention their chief
functions in plant cells. 7
OR
Write short notes on the following 3½+3½=7
Senescence
Photoperiodism
4. Write a note on mechanism of DNA transcription. 7
OR
Write short notes on the following 3½+3½=7
Classification of carbohydrates
Types of amino acid
5. What is pollution? Write the causes and control measures of air pollution.

OR
Write short notes on the following 3½+3½=7
Ecological pyramid
Ecotypes and ecads