EXERCISE-5A Q1. What do you understand by the term up thrust of a fluid? Describe an experiment to show its existence.Solution:A b ody experiences an upward pull when it is partially or fully submerged in a liquid. An upthrust is the term for this upward thrust.The experiment below can be used to show upthrust:Use an […]
Continue ReadingEXERCISE-6A Q1. What is heat? Write its S.I. unit.Solution:The energy of the body’s molecular constituents’ haphazard motion is known as heat.“Joule” is its SI unit. Q2. Two bodies at different temperatures are placed in contact. State the direction in which the heat will flow.Solution:A hot body (one with a greater temperature) will transfer heat to […]
Continue ReadingExercise – I Q1. Name the four main sources of water.Answer:(i) Oceans(ii) Seas(iii) Rivers(iv) Lakes Q2. State the importance of water cycle in nature.Answer:(i) Water cycle helps in regulating weather on the earth.(ii) Water cycle makes water available in various forms on the earth. Q3. Why is water very precious for all living beings?Answer:One of […]
Continue ReadingTopic-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 […]
Continue ReadingTOPIC-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) […]
Continue ReadingTopic-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 […]
Continue ReadingTopic-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 […]
Continue ReadingTopic-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 […]
Continue ReadingTOPIC-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 […]
Continue ReadingTopic-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 ? […]
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