Class 12th Biology 2013 Set3 Delhi Board Paper Solution
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Q1 Why is the enzyme cellulase needed for isolating genetic materi...
Q2 Write the importance of MOET.
Q3 An anther with malfunctioning tapetum often fails to produce vi...
Q4 Why sharing of injection needles between two individuals is not...
Q5 Name the enzyme and state its property that is responsible for ...
Q6 Sweet potato tubers and potato tubers are the result of converg...
Q7 Write the equation that helps in deriving the net primary produ...
Q8 Name the type of biodiversity represented by the following:
Q9 Explain why very small animals are rarely found in polar region.
Q10 Why the pyramid of energy is always upright? Explain.
Q11 Expand the following and mention one application of each: ...
Q12 Name any two sources of e-Wastes and write two different ways f...
Q13 Explain the steps that ensure cross pollination in an autogamou...
Q14 When and where do chorionic villi appear in humans? State their...
Q15 In a cross between two tall pea plants some of the offsprings p...
Q16 A student on a school picnic to a park on a windy day started s...
Q17 Why and how bacteria can be made competent?
Q18 (a) Name the deficiency for which first clinical gene therapy w...
Q19 (a) Why is human ABO blood group gene considered a good example...
Q21 (a) Differentiate between inbreeding and outbreeding. (b) E...
Q22 (a) Why are the fruit juices bought from market clearer as comp...
Q24 With the help of any two suitable examples explain the effect o...
Q25 How have human activities caused desertification? Explain. ...
Q26 Explain mutualism with the help of any two examples. How is it ...
Q27 (a) Why are transgenic animals so called? (b) Explain the ...
Q28 A child by the family from Thalassemia is born to a normal coup...
Q29 (a) Draw a diagram of a mature embryo sac of an angiosperm and ...
Q30 Describe the asexual and sexual phases of life cycle of Plas...
Question 22
(a) Why are the fruit juices bought from market clearer as compared to those made at home? (b) Name the bioactive molecules produced by Trichoderma polysporum and Monascus purpureus.
Answer
(a) Fruit juices bought from market are clearer as compared to home because bottled juices are clarified by the use of poctinases and proteases.
(b) Trichoderma polysporum produces Cyclosporin A.
Monosacus purpurens produces statins.
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Q:- What is the major advantage of producing plants by micropropagation?
Q:- Three water samples namely river water, untreated sewage water and secondary effluent discharged from a sewage treatment plant were subjected to BOD test. The samples were labelled A, B and C; but the laboratory attendant did not note which was which. The BOD values of the three samples A, B and C were recorded as 20mg/L, 8mg/L and 400mg/L, respectively. Which sample of the water is most polluted? Can you assign the correct label to each assuming the river water is relatively clean?
Q:- Give an example for: (a) An endothermic animal (b) An ectothermic animal (c) An organism of benthic zone
Q:- Fill in the blanks:
(a) Humans reproduce __________. (asexually/sexually)
(b) Humans are__________. (oviparous/viviparous/ovoviviparous)
(c) Fertilization is __________ in humans. (external/internal)
(d) Male and female gametes are __________. (diploid/haploid)
(e) Zygote is __________. (diploid/haploid)
(f) The process of release of the ovum from a mature follicle is called__________.
(g) Ovulation is induced by a hormone called the __________.
(h) The fusion of male and female gametes is called _____________.
(i) Fertilisation takes place in _____________.
(j) Zygote divides to form _____________which is implanted in uterus.
(k) The structure which provides vascular connection between fetus and uterus is called ____________.
Q:- What is primary productivity? Give brief description of factors that affect primary productivity.