Biology and Human Welfare
- Select the mismatch :(1) Rhodospirillum - Mycorrhiza(2) Anabaena - Nitrogen fixer(3) Rhizobium - Alfalfa(4) Frankia - Alnus Answer: 1. Rhodospirillum - Mycorrhiza Key idea: Match each microbe with its true role. Rhodospirillum is a photosynthetic purple bacterium... 1
- Interspecific hybridization is the mating of Answer: 1. two different related species In interspecific hybridisation, male and female animals of two different related species are mated... 1
- Match Column—I with Column—II and select the correct option using the codes given below :Column—I: a. Citric acid; b. Cyclosporin A; c. Statins; d. Butyric acidColumn—II: (i) Trichoderma; (ii) Clostridium; (iii) Aspergillus; (iv) MonascusCodes :a b c… Answer: 1. (iii) (i) (iv) (ii) Citric acid: Aspergillus niger (iii). Cyclosporin A (immunosuppressant): Trichoderma polysporum (i). Statins... 1
- Which of the following is wrongly matched in the given table ?Microbe | Product | Application(1) Trichoderma polysporum | Cyclosporin A | immunosuppressive drug(2) Monascus purpureus | Statins | lowering of blood cholesterol(3) Streptococcus | Strept… Answer: 4. Clostridium butylicum - Lipase - removal of oil stains Clostridium butylicum is used to produce butyric acid. Lipase is obtained... 1
- The primitive prokaryotes responsible for the production of biogas from the dung of ruminant animals, include the : Answer: 3. Methanogens Methanogens are archaebacteria found in the rumen of cattle. They produce methane and are responsible for biogas prod... 1
- A system of rotating crops with legume or grass pasture to improve soil structure and fertility is called : Answer: 1. Ley farming Key idea: Ley farming alternates cereal crops with legume or grass pasture for a few years to restore soil structure... 1