Ncert- science – class 7- Chapter 12 – Forests: Our Lifeline 2 Welcome to your Ncert- science – class 7- Chapter 12 – Forests: Our Lifeline 2 1. Trees in the forest have ______ of different type, size and shape to make understories. stems canopies flowers crowns None 2. Different layers of vegetation provide _________ and________for animals. Shelter and air Food and water Food and shelter Air and water None 3. Which of the following statements are correct? I. If forests disappear, the amount of carbon dioxide in air will increase, resulting in the increase of earth's temperature.II. In the absence of trees and plants, animals will get no food and shelter.III. In the presence of trees, the soil will not hold water, which will cause floods.IV. Deforestation will endanger our life and environment. I, II and III II, III and IV Only I and II I, II and IV None 4. Study the following statements regarding food chains and select the correct ones.(i) Removal of 80% tigers from an area resulted in greatly increased growth of vegetation.(ii) Removal of most of the carnivores resulted in an increased population of deers.(iii) The length of food chains is generally limited to 3−4 trophic levels due to energy loss.(iv) The length of food chains may vary from 2 to 8 trophic levels. (i) and (ii) (iii) and (iv) (i) and (iii) (ii) and (iii) None 5. Forests prevent floods. How do they do so? They inhibit rainfall. They help the soil to hold water. Trees do not allow rain to reach ground at all. Oxygen liberated by trees reacts with the rain water and hence, reduce the amount of water. None 6. Deforestation leads to the increased percentage of which of the following components of the environment? Oxygen Nitrogen None of the above Carbon dioxide None 7. Which of the following groups of wild animals represents the inhabitants of only deeper areas of the forest? Cat, kangaroo, lion, elephant Rabbit, beer, tiger, donkey Boar, bison, jackal, porcupine Dog, snake, monkey, deer None 8. Which of the following roles is played by canopy during rain? Slowing down the speed of rain drops Absorption of water Seepage of water Restoration of water table None 9. Find the odd one out.Neem, Tulsi, Amla and Teak. Tulsi Amla Teak Neem None 10. Which of the following is not a medicinal plant? Neem Eucalyptus Teak Amla None 11. What is the role of humus in the forest? To ensure the growth of microorganisms To ensure the warmth in the soil To ensure the release of nutrients into the soil To ensure the presence of earthworms in the soil None 12. Match the items in Group (A) with the items in Group (B) on the basis of the parts of the plant they are obtained from.Group (A)Group (B)Matchstick(i)Bark Oil(ii)leaves Paper(iii)rootsTea(iv) Seeds (v)Stem or branch 1 - (v), 2 - (iv), 3 - (i), 4 - (ii) 1 - (iii), 2 - (ii), 3 - (v), 4 - (iv) 1 - (v), 2 - (iv), 3 - (ii), 4 - (iii) 1 - (iii), 2 - (v), 3 - (ii), 4 - (i) None 13. Ecology TermsTermDefinitionCanopyPrevent soil erosionCrownFeed on dead plants and animalsRootsRoof of tall treeDecomposerBranchy part above stem 1 - C, 2 - D, 3 - B, 4 - A 1 - C, 2 - D, 3 - A, 4 - B 1 - D, 2 - C, 3 - A, 4 - B 1 - B, 2 - D, 3 - A, 4 - C None 14. Forest officers are trained to recognise the presence of animals in the forest from various characteristics. Which of the following characteristics are used by them to recognise the presence of animals? (i) Body odour(ii) Footprints(iii) Droppings Only (iii) (i), (ii), and (iii) Only (i) and (ii) Only (ii) and (iii) None 15. A natural resource is a substance/commodity that is a gift of nature which is very useful to mankind. Either False True Neither None Time's up Please Share This Share this content Opens in a new window Opens in a new window Opens in a new window Opens in a new window Opens in a new window Opens in a new window Opens in a new window Opens in a new window Opens in a new window Opens in a new window Leave a Reply Cancel replyCommentEnter your name or username to commentEnter your email address to commentEnter your website URL (optional) Save my name, email, and website in this browser for the next time I comment.
