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ISC Class XII Sample / Model Paper 2024 : Biology

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Sample Question Paper Class XII (2015-16) Biology (044) Marking Scheme Section - A 1. a) sex-linked b) Haemophilia/ Colour blindness 2. It remains active during the high temperature induced denaturation of double stranded DNA. 1 3. Incentives given to couples with small families /media publicity posters of happy couples with two children( slogan- Hum Do Humare Do)./ Motivate to promote smaller families by using contraceptive methods (Any two) ( x2) 4. Thymus provides micro-environment for the development and maturation of Tlymphocytes; its degeneration will weaken the immune system so the child will be prone to frequent infections. ( x 2) 5. Down s Syndrome 1 Section - B 6. Pollen has an outer layer called exine which is made of sporopollenin. Most resistant organic material known/ withstand high temperature, strong acids and alkali/ no enzyme that degrades sporopollenin so far known. (Any three) ( x3=1 ) 7. Since RNA was unstable and prone to mutations, DNA evolved from RNA with chemical modifications that make it more stable. DNA has double stranded nature and has complementary strands. These further resist changes by evolving a process of repair. (1+1=2)

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