GYANDEEP ACADEMY
Half yearly exam 2024
HS second year
Sub: biology
Part A (botany) mark=25 time =2 hours
1.Answer the following questions 1x6=6
a) what is sporopollenin?
b) what is cheiropterophily?
c) The pollen grains represent --------
1)male gamete 2) male gametophyte c) sporangium
d) name the bacteria used in ripening of swiss cheese ?
e) what are flocs?
F) write full form – KVIC , VAM
2.What is the use of cyclosporin A? From which micro organism , it is obtained?
2
3.Define biocontrol agent? 2
4.What is meant by polyembryony in angiosperms? write its importance? 3
5.Write about secondary treatment of sewage ? why it is called biological
treatment ? 3=1=4
6.Write a brief account on development of dicot embryo with suitable
diagrams . 6
7.write short note on – a)commensalism OR b) parasitism 2
PART B (zoology)
1 Answer the following. 1*5=5
a. What is the main function of interstitial cell of seminiferous tubules?
b. What is template strand?
c. Which hormone induce ovulation?
d. What is manopause?
e. What is sex linked inheritance? Give one example.
2. Answer in brief. 2*3=6
a. Write the names of enzymes in DNA replication.
b. DWhat is point mutations? Give one example
c. Write briefly about central dogma of molecular biology
3 Give difference between (any two) 2*2=4
a. Transcription and translation
b. Morula and blastula
c. Incomplete dominance and co dominance
d. Homozygous and heterozygous
4. Draw the labelled diagram of matured human sperm. 3
Or
Draw the labelled diagram of Watson and Crick model of semi conservative
replication of DNA .
5. Explain the Mandel dihybrid cross. 3
6. Explain the process of transcription or DNA replication.
4
