Justify the following sentences :
(a) The conersation of endangered species of plants and animals is necessary .
(b) Pollution Under Control (PUC) certificate is mandatory for all vehicles and industries .

Given is a statement followed by two assumptions numbered I and II. Consider the statement and the following assumptions is/are implicit in the statement . Statement : All the species of plants and animals are part of biodeversity and ecosystems and play major role in the overall health of the environment. Assumptions : I. Preserve or create a backyard habitat .Save as many native plants as you can when building or landscaping . II One of the major goals of sustainability is to preserve biodiversity .All life on Earth is connected through the flow of energy (planetary food web), and each time a species becomes endangered or lost to extinction ,one more part of that energy flow is lost .

Which of the following statements are true ? Justify your answer . (i) The set of dogs is contained in the set of animals. (ii) The set of all isosceles triangles is contained in the set of all equilateral triangles . (iii) The set of all rectangles is contained in the set of squares . (iv) The sets A = {x:x is letters in the word LITTLE} and B= {x:x is a letter in the word TITLE} are equal. (v) Every set has a proper subset.

Which of the following statements is correct? A. Flood can cause cholera and diarrhoea. B. Due to drought and water scarcity plants and animals can even die. C. Due to consumption of polluted water human can suffer from neurological syndrome.

Read the following text and answer the following question on the basis of the same : Excessive exploitation of species , whether a plant or animal reduces the size of its population , so it becomes vulnerable to extinction . Such as Dodo and passenger pigeon have become extinct due to over exploitation by humans . Thus the world is facing accelerated rates of species extinctions , largely due to human interference . Assertion : Pollution reduces species biodiversity . Reason : Spillover of oil in sea cause death of serval marine animals .

Read the following five statements (A to E) and select the option with all correct statements: (A) Motor vehicles equipped with catalytic converter should use unleaded petrol. (B) Proper maintenance of automobiles along with use of lead-free petrol or diesel can reduce the pollutants they emit. (C) According to Central Pollution Control Board (CPCB), particulate size 10 micrometers or less in diameter are responsible for causing the greatest harm to human health. (D) Catalytic convertres, having expensive metals namely platinum-palladium and rhodium as the catalysis, are fitted into automobiles for reducing emission of poisonous gases. (E) In India, the Air (Prevention and Control of Pollution) Act came into force in 1987.

Which of the following statements regarding eutrophication are correct ? (i) Eutrophication is the natural ageing of a lake by nutrient enrichment of its water. (ii) Pollutants from human activities like effluents from the industries and homes can radically accelerate the aging process of a lake. This phenomenon is called as cultural or accelerated eutrophication. (iii) The plant nutrients responsible for eutrophication are nitrates and phosphates. (iv) These phosphates and nitrates accelerate the growth of algae, which utilise oxygen and may deoxygenate the water to kill the fish and other aquatic animals.