Tiêu đề VII Science MS.pdf ✅

KENDRIYA VIDYALAYA SANGATHAN, LUCKNOW REGION MID TERM EXAMINATION – 2023 – 24 CLASS 7TH – SCIENCE – SET 1 – MARKING SCHEME SECTION A Q1. c) Photosynthesis 1 Q2. b) Bile juice OR a) Acidic Medium 1 Q3. d) Copper is a better conductor of heat than the stainless steel 1 Q4. a) Organic matter 1 Q5. b) Mercury 1 Q6. d) Calcium carbonate 1 Q7. b) Spiracles OR a) Lungs 1 Q8. d) depends on source 1 Q9. a) acidic medium 1 Q10. b) chemical change 1 SECTION B Q11. Saprophytes acquire nutrients from dead and decaying matter Example: Fungi ( or any other ) Parasites live on or in a host and get its food at the expense of its host. Example: roundworm (or any other ) OR Some organisms live together and share both shelter and nutrients. This relationship is called symbiosis. For example - Lichens ( or any other) 2 Q12. a) small intestine b) mouth c) stomach d) small intestine 1⁄2 X 4 Q13. The finger like projections in the inner walls of the small intestine is called villi. These are found in small intestine. Function: The villi increase the surface area for absorption of the digested food. OR Mucous protect the inner lining of the stomach from the hydrochloric acid. 2 Q14. Conductors : Iron and copper insulators : Plastic and wood 1⁄2 X 4 Q15. a) Land breeze blows during ---- (iv) night b) Sea breeze blows during ---- (iii) day c) Dark coloured clothes are preferred during ---- (ii) winter d) Light coloured clothes are preferred during ----- (i) summer 1⁄2 X 4 Q16. It is basic in nature. 2 Q17. a) F b) F 1 X 2

Q25. Similarity: The digestive juices in amoeba are secreted into food vacuole and in human beings the digestive juices are secreted in stomach and small intestine. Then the juices convert complex food into simpler soluble and absorbable substances. ‘ Difference: Amoeba captures the food with help of pseudopodia and engulf it. In human beings food is taken by the mouth. 3 SECTION D Q26. a) In case B, the pin P will fall before the pin Q. b) The heat will reach pin P first due to conduction of heat. In case A, the heat travels in both the directions and pins P and Q will fall simultaneously. c)The process by which heat is transferred from the hotter end to the colder end of object is known as conduction. Example of conductor- aluminum / iron / copper (any one). OR a. Clinical thermometer. b. Two precautions that we need to take while using clinical thermometer are: • It should be washed before and after use, preferably with an antiseptic solution. • Ensure that before use the mercury level is below 350C. c. The range of a laboratory thermometer is generally from -100 C to 1100 C. d. Digital thermometer. e. The Kink near the bulb prevents the mercury from falling on its own in aclinical thermometer. 1 2 2 1 2 2 Q27. i) d) All of the above ii) d) Proteins iii) d) Bacteria iv) Desert plants have scaly or spin leaves as compared to other normal plants to reduce water loss by transpiration. v) Certain bacterias present in soil converts gaseous nitrogen into more useable form and release it into soil and also nitrogen containing fertilizers are added to soil to fulfil nitrogen requirements of plants. 1 1 1 1 1 Q28. i) d) All of the above ii) a) Insect iii) d) Frog iv) The small opening on the sides of a cockroach’s body is called as spiracle. v) One touching the skin of the earthworm one would feet it moist and slimy. 1 1 1 1 1