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1. Why is diffusion insufficient to meet the oxygen requirements of multi- cellular organisms like humans? 2. What criteria do we use to decide whether something is alive? 3. What are outside raw materials used for by an organism?  4. What processes would you consider essential for maintaining life?  5. What are the differences between autotrophic nutrition and heterotrophic nutrition?  Ncert video solution.   6. Where do plants get each of the raw materials required for photosynthesis?  7. What is the role of the acid in our stomach?  8. What is the function of digestive enzymes?  9. How is the small intestine designed to absorb digested food?  10. What are the advantage over an aquatic organism does a terrestrial organism have with regard to obtaining oxygen for respiration?  11. What are the different ways in which glucose is oxidized to provide energy in various organisms?

Full question analysis  1. Which of the following are matter? Chair, air, love, smell, hate, almonds, thought, cold, cold- drink, smell of perfume.  2. Give reasons for the following observation The smell of hot sizzling food reaches you several metres away, but to get the smell from cold food you have to go close. 3. A diver is able to cut through water in a swimming pool. Which property of matter does this observation show? 4. What are the characteristics of the particles of matter? 5. The mass per unit volume of a substance is called density. (density = mass/volume). Arrange the following in order of increasing density – air exhaust from chimneys, honey, water, chalk, cotton and iron. Ncert Viedo solution.     6.(a) Tabulate the differences in the characterisitcs of states of matter. (b) Comment upon the following rigidity, compressibility, fluidity, filling a gas container, shape, kinetic energy and density. 7. Give reasons (a) A gas fills completely the vesse...

Before flood ·          Ignore rumors, stay calm , don’t panic ·          Keep your mobile phone for emergency connection; use sms ·          Listen to radio, watch TV , read newspaper for weather update   ·          Keep animal/cattle untied to insure their safety ·          Prepare an emergency kit with essential items for safety and survival ·          Keep first aid kit with extra medication for snakes bite and diarrhea ready ·          Keep your documents and valuable in water proof bag During flood ·          Don’t enter flood water. In case you need to, were suitable footwear   ·          Stay awa...

1. A driver of a autorickshaw makes a profit of 20% on every trip when he carries 3 passengers and the price of petrol is 30 rupees a litre. Find the percentage profit for the same journey if he goes for four passengers per trip and the price of petrol reduces to 24 rupees per litre. (Assume that revenue per passenger is the same in both the cases.) (a) 33.33% (b) 65.66 (c) 100%  (d) Data inadequate 2. After selling a watch, Shyam found that he had made a loss of 10%. He also found that had he sold it for 27 rupees more, he would have made a profit of 5%. The actual initial loss was what percentage of the profit earned, had he sold the watch for a 5% profit? (a) 23% (b) 150% (c) 200%  (b) 180% 3.Sambhu buys rice at  ₹10/kg and puts a price tag on it so as to earn a profit of 20%. However, his faulty balance shows 1000 gm when it is actually 800 gm. What is his actual gain percentage?  (a) 50%  (b) 40%  (c) 18%  (d) 10% 4....