Biology Today - February 2018

SECTION - A

1. What is the role of filiform apparatus in embryo sac?


2. Arrange the following primates in increasing order of brain
   capacity.
   Neanderthal man, +RPRKDELOLV, +RPRHUHFWXV


3. Mention two basic amino acids present in histones.


4. Mother's milk is considered very essential for the new born
   infant. Why?


5. Suggest a technique to a researcher who has cut DNA into
   fragments by restriction enzyme and now needs to separate
   them.
   SECTION - B


6. How does pollination take place in cleistogamous flowers?


7. Draw a sketch of a transcription unit.

OR

What is the role of coelacanth in evolution?

8. What is the source of statins? Mention the action of statins.


9. Identify 'A', 'B', 'C', 'D' in the given table.

Crop Variety Insect pests

A Pusa Gaurav B

Flat bean C Jassids

Okra Pusa A-4 D

10. Give an example of following types of interactions -
    (a) Commensalism (b) Mutualism
    SECTION - C


11. What is placenta? How does it act as an endocrine gland
    during pregnancy?


12. Diagrammatically represent the process of transcription in
    bacteria.


13. Briefly explain any two chromosomal disorders in human.


14. What is parthenocarpy? How does parthenocarpy differ
    from agamospermy?


15. Define biogeography. How do Darwin's finches provide the
    biogeographical evidence in favour of evolution?


16. How has MOET programme resulted in herd improvement?
    OR
    Mention some special techniques which can assist infertile
    couples to have children. Why test tube baby technique is
    called IVF?


17. Explain the role of baculoviruses as biological control
    agents. Describe their role in integrated pest management
    programmes.


18. Name the type of immunity that is present at the time
    of birth in human. Explain any three ways by which it is
    accomplished.


19. Explain how gene therapy has cured adenosine deaminase
    (ADA) deficiency in humans.

GENERAL INSTRUCTIONS

(i) All questions are compulsory.

(ii) This question paper consists of five sections A, B, C, D and E. Section A contains 5 questions of one mark each, Section B contains

5 questions of two marks each, Section C contains 12 questions of three marks each, Section D contains 1 question of VBQ type with

four marks and Section E contains 3 questions of five marks each.

(iii) There is no overall choice. However, an internal choice has been provided in one question of 2 marks, one question of 3 marks and all the

three questions of 5 marks weightage. A student has to attempt only one of the alternatives in such questions.

(iv) Wherever necessary, the diagrams drawn should be neat and properly labelled.

Time Allowed : 3 hours Maximum Marks : 70