Botany B.Sc. 1st-Semester Previous Year Old Question Paper Jammu University, Under Graduation

B.Sc. I - Semester Examination
BS-IS/12
229774
BOTANY
Course No.: 101

Time Allowed: 3 hours                                                                           Maximum Marks: 80

Note :
a) Attempt all questions
b) Question no.1 in Section-I is compulsory and carries 20 marks (2 for each part). Answer to each part should not exceed 20 words.
c) All questions in Section-II carry 12 marks each.

Section - I

1. Attempt all parts
a) What is ‘Centromere’. Describe its significance
b) What is the main difference between active and passive transport through plasma membrane
c) What is ‘Satellite DNA’
d) Enlist main functions of smooth endoplasmic reticulum.
e) Describe the main functions of ‘tRNA’
f) Enlist intra- and inter-chromosomal aberrations under separate heads.
g) Differentiate between spontaneous and induced mutations
h) What are ‘IS elements’
i) What are the main components of plasma membrane
j) Differentiate between secondary and tertiary trisomics

Section - II

2. Describe the structural organisation of ribosomes in pro- and eukaryotes. Discuss their role.

OR

Describe in detail the structure and formation of primary cell wall
3. Write short notes on:
a) Telomere
b) Repetitive DNA

OR

What do you understand by ‘reductional division’. Describe its various stages and emphasise on its significance
4. Describe the stepwise synthesis of proteins from mRNA

OR

Describe the organisation of DNA in prokaryotic genomes. Enlist the important differences in this organisation in Eukaryotes
5. Differentiate between an auto- and allo-tetraploid. Describe the role of polyploidy in the evolution of cotton.

OR

What are aneuploids? Enlist their various types. Describe the origin of any one among these
6. What is ‘Linkage’ and ‘Crossing Over’. Describe the role of both in mapping of genes.

OR

What are transposable elements? Describe their salient features taking ‘Tn’ elements as an example.