LOYOLA COLLEGE (AUTONOMOUS), CHENNAI – 600

IB 47

B.Sc. DEGREE  SEMESTER EXAMINATION – PLANT BIO. &  BIO TECH.

APRIL 2007

B 315 Plant Cell Structure

 

 

Date & Time :30.04.07 / 1:00 – 4:00        Dept. No.                                                             Max. : 100 Marks

 

 

 

Part A                                                                          (10 x 2 = 20)

 

Write short notes on the following:

1. Cell theory
2. Ergostic substances
3. Middle lamella
4. Prokaryotic ribosome
5. Heterochromatin
6. Introns and exons
7. Centrioles
8. Crossing over
9. Senescence
10. Karyotype

 

Part B                                                                         (5 x 8 = 40)

 

Answer any FIVE of the following, not exceeding 350 words each. Draw necessary diagrams.

 

1. Describe the chemical composition of plant cell wall.
2. Bring out the biological properties of cytoplasm.
3. Explain the structure and types of lysosomes in plants.
4. Briefly explain chromosomal variations in numbers.
5. Write notes on “one gene one enzyme” hypothesis.
6. Describe nucleocytoplasmic interaction with reference to Acetabularia.
7. Give the cytological changes caused due to crown gall disease.
8. What are the cytological responses of plants to pollutions?

 

Part – C                                                                        (2 x 20 = 40)

 

Answer the following in not more than 1500 words. Draw necessary diagrams.

 

1. (a) Explain the structure and chemical composition of plasma membrane.

Or

(b) Describe ultra structure of chloroplast. Add note on the types of plastids.

 

1. (a) Illustrate and explain the various stages of meiosis.

Or

(b) Write notes on the structure of DNA. Add note on its replications.

 

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