Category: ICSE Class 12 Biology

Topic-1Pollution, Solid and Radioactive Wastes Very Short Answer Type Questions Question. List two advantages of the use of unleaded petrol in automobiles as fuel.Answer : The advantages are as follows :(i) Unleaded petrol does not release lead compounds from exhaust fumes into the atmosphere and causes less pollution.(ii) It does not emit harmful compounds, it helps in preventing health […]

TOPIC-1Biodiversity and its Patterns Very Short Answer Type Questions Question. Write the level of biodiversity represented by mangrove. Give another example falling in the same level.Answer : Mangroves represent the ecological diversity. The same level of biodiversity is also shown by rain forests, coral reefs wetlands, estuaries and alpine meadows, etc. Question. Name the type of biodiversity represented by the following :(i) […]

Topic-1Ecosystem – Structure and Function, Productivity andDecomposition Very Short Answer Type Questions Question. What does ‘R’ represent in the given equation for productivity in an ecosystem ?GPP — R = NPP.Answer : ‘R’ represents the loss of biomass due to respiration. Question. All primary productivity is not available to herbivore. Give one reason.Answer : All primary productivity is not available […]

Topic-1Origin of Life on Earth and Various Related Evidences Very Short Answer Type Questions Question. Define Diapause.Answer : Diapause is a stage of suspended development in zooplanktons species under unfavourable conditions. Question. How do seed – bearing plants tide over dry and hot weather conditions ?Answer : In higher plants, seeds and some other vegetative reproductive structures serve to tide […]

Topic-1Application of Biotechnology in Agriculture and Medicine Very Short Answer Type Questions Question. Why do children cured by enzyme-replacement therapy for adenosine deaminase deficiency need periodic treatment ? Answer : As this therapy does not cure the disease completely it requires periodic treatment.  Question. What happens when Meloidogyne incognita consumes cells with RNAi gene ?Answer : Using Agrobacterium vectors, the nematode specific genes […]

TOPIC-1Principles of Biotechnology and Tools of Recombinant DNA Technology Very Short Answer Type Questions Question. Suggest a technique to a researcher who needs to separate fragments of DNA.Answer : Gel electrophoresis is used to separate DNA fragments. Question. How can following be made possible for biotechnology experiments?(i) Isolation of DNA from bacterial cell.(ii) Reintroduction of recombinant DNA into a bacterial […]

Topic-1Microbes-in Household Products, Industrial Products and in Sewage Treatment and Biogas Very Short Answer Type Questions Question. How is lactic acid bacteria beneficial to us other than helping in curdling the milk ?                                                […]

Topic-1Animal Husbandry Very Short Answer Type Question Question. Mention the economic value of Apis indica.Answer : Apis indica is a common species of honey bee used in apiculture. It is also useful in agriculture yield / honey / bee wax / pollination. Question. Name any interspecific hybrid mammal.Answer : Mule is an interspecific hybrid mammal. It is obtained by following […]

Topic-1Health and Related Aspects, Common Human Diseases and Immunity Very Short Answer Type Question Question. Name two diseases whose spread can be controlled by the eradication of Aedes mosquitoes.Answer : Dengue, Chikungunya//Yellow Fever / EasternEquine Encephalitis / West Nile Fever / Zika / Zika Viral Disease. Question. How do cytokinin barriers provide innate immunity in humans?      […]

Topic-1Origin of Life on Earth and Various Related Evidences Very Short Answer Type Questions Question. State a reason for the increased population of dark coloured moths with the loss of lichens (on tree barks) during industrialization period in England.Answer : During industrialization period in England the lichens got wiped out due to air pollution and tree trunks became dark due […]