NOTE: Attempt FIVE questions in all, including question No. 8 which is COMPULSORY. All questions carry EQUAL marks.

1. (a) Define POLYPLOIDY and explain its role in the origin of new species. (15)
(b) Explain TEST CROSS and give its significance. (5)

2. (a) Describe the structure and function of PLASMA MEMBRANE. (10)
(b) Explain the factors that affect the rate of ENZYME ACTION. (5)
(c) Define INHIBITORS and give its types. (5)

3. (a) Write what you know about the theory of NATURAL SELECTION. How does it differ from MUTATION THEORY? (15)
(b) Briefly discuss the EMBRYOLOGICAL EVIDENCE of animal evolution. (5)

4. (a) Write about NITROGEN CYCLE in detail. (8)
(b) Write short notes on the following: (12)
(i) GREEN HOUSE EFFECT
(ii) PARASITISM
(iii) PREDATION

5. (a) What about NITROGEN CYCLE in detail. (8)
(b) What is FEED BACK MECHNISM with respect to HORMONES? Explain with examples. (5)
(c) Write about the transport oxygen in man and mention the factors which affect the capacity of hemoglobin to combine with oxygen. (7)

6. Write an essay on GENETIC ENGINEERING. (20)

7. Write notes on the following: (20)
(a) CHROMOSOME MAP
(b) RH-factor
(c) MITOCHONDRIA
(d) FOOD WEB


8. Write only the correct answer in the Answer Book. Do not reproduce the questions.

(1) Many humans become ill by consuming milk products because they lack:
(a) Bacteria in their intestines
(b) Rennin
(c) Hydrochloric acid
(d) Lactase
(e) None of these

(2) Which of the following process cause substance to move across membranes without the expenditure of cellular energy?
(a) Endocytosis
(b) Active transport
(c) Diffusion
(d) None of these

(3) Respiratory pigment present in muscles is called:
(a) Haemoglobin
(b) Myoglobin
(c) Haemocyanins
(d) Globin
(e) None of these

(4) Which one of the following is not a viral disease?
(a) Mumps
(b) Small-pox
(c) Cow-pox
(d) Tetanus
(e) None of these

(5) Animals obtain Carbohydrates mainly from:
(a) Sucrose
(b) Glycogen
(c) Starch
(d) Glucose
(e) None of these

(6) Mesosomes are internal extensions of:
(a) Cell Wall
(b) Cell Membrane
(c) Chromatin body
(d) None of these

(7) Sugar in each nucleotide of DNA is:
(a) Deoxyglucose
(b) Ribose
(c) Glucose
(d) Deoxyribose
(e) None of these

(8) Species is the basic unit of:
(a) Genetics
(b) Zoology
(c) Ecology
(d) Universe
(e) None of these

(9) Which one of the following is false about AIDS:
(a) HIV
(b) HAV
(c) T-lymphocytes
(d) Host specific
(e) None of these

(10) Which statement about plastids is true?
(a) They are power house of cell
(b) They contain DNA and ribosomes
(c) They are found in all organisms
(d) They are surrounded by a single membrane
(e) None of these

(11) Which of the following is not found in all bacterial cells?
(a) A nucleoid
(b) Capsule
(c) Cell membrane
(d) Ribosomes
(e) None of these

(12) A virion is a:
(a) Viral protein
(b) Viral gene
(c) Virus
(d) Viral lysozyme
(e) None of these

(13) The study of fossils and their relationship to the evolution of life on earth is called:
(a) Fossilization
(b) Palaeontology
(c) Palaeozoology
(d) None of these

(14) A connecting and supporting tissue in animal is:
(a) Muscle
(b) Bone
(c) Nerve
(d) Connective
(e) None of these

(15) Interstitial fluid closely resembles to:
(a) Rain water
(b) Sea water
(c) Lake water
(d) Pond water
(e) None of these

(16) The amount of lactic acid in muscles increases when they are lacking in:
(a) CO2
(b) C6H12O6
(c) Energy
(d) Oxygen
(e) None of these

(17) If a person eats more protein than are needed, this causes increased production of:
(a) Hormones
(b) Urea
(c) Lactic acid
(d) CO2
(e) None of these

(18) The growth of human population is most rapid in:
(a) Asia
(b) Europe
(c) North America
(d) None of these

(19) Which type of tissue forms glands?
(a) Connective
(b) Nervous
(c) Muscle
(d) Epithelial
(e) None of these

(20) Carbon combines with nitrogen in amino acid linkages to form:
(a) Ester bonds
(b) Peptide bonds
(c) Ionic bonds
(d) None of these

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