SECTION - A- Pick out the monoecious plant from the following.
(a) Coccinia (b) Papaya
(c) Cucumber (d) Date palm - The given figure shows three different points a, b and
C on a DNa strand.
Which of them can be a probable site of action of
restriction enzymes and why?
- How do virus infected cells provide innate immunity
to healthy cells? - Suggest any two techniques which can help in early
detection of bacterial/viral infections, much before the
symptoms appear in the body. - How much time is taken by a primary succession to
complete?
SECTION - B - What is colostrum? How is milk production regulated
by hormones in human females? - In a certain mammal, erect ears are dominant over
drooping ears. In a cross between the two types, out
of the four offsprings produced in f 2 generation, three
had erect ears, and one had drooping ears. What will
be the genotypes of the parents? (you may represent
dominant gene as āeā).- Stanley Miller and Harold C. urey performed an
experiment by recreating in the laboratory, the probable
conditions of the atmosphere of the primitive earth.
(i) What was the purpose of the experiment?
(ii) In which form was the energy supplied for the chemical
reactions to occur?
(iii) for how long was the experiment run continuously?
(iv) Which gases were used during the experiment to
simulate the primitive atmosphere? - Write the full form of SCID and mention the cause of
this congenital disorder. Mention any one difference
between SCID and aIDS.
OR
Why does our body temperature rise when we have
any infection? How does moderate fever help in body
defence? - State the differences between primary succession and
secondary succession.
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 is of 5
questions of two marks each, Section C is of 12 questions of three marks each. Section D is of 1 question of VbQ type with four
marks and Section e is of 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.