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46 - 60: MCQs for General Science for Govt. Exams (UPSC and SSC)
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In this lesson, Dr. Roman Saini will discuss the MCQs related to various topics in General Science from Class 6 to Class 8 (Science) NCERT.

Roman Saini is teaching live on Unacademy Plus

Roman Saini
Part of a great founding team at Unacademy with Gaurav, Hemesh. Movies, Guitar, Books, Teaching.

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Pawan Saini
2 years ago
You are most welcome
12/15 and 52/60 Thank you Roman sir
8/10 Thank you sir
Sudharsan Rajan
3 years ago
8/15* Thank you sir
iski PDF hogi ?...kahan se download kar sakte hai ?
53/60...Awesome lesson..thanks a lot for such hard work..
  1. Q46. Which of the following cells can respire anaerobically? 1. Brain cells 2. Muscle cells Yeast 4. Stomach cells Choose the correct code. a. b. 2 and 3 only 1 and 2 only c. and 4 only d. 2 and 4 only


  2. Answer: b Explanation: Yeasts are single-celled organisms. They respire anaerobically and during this process yield alcohol. They are, therefore, used to make wine and beer. Muscle cells can respire anaerobically when there is a temporary deficiency of oxygen such as during heavy exercise.


  3. Q47. Breathing involves the movement of Rib cage 2 Diaphragm Windpipe Nostrils 4 Choose the correct code a. 1 and 2 only b.2 and 3 only c. and 4 only d. 1, 2 and 4 only


  4. Answer: a Explanation: Breathing involves the movement of the diaphragm and the rib cage. Diaphragm is a large, muscular sheet that forms the floor of the chest cavity. During inhalation, ribs move up an outwards and diaphragm moves down. This movement increases space in our chest cavity and air rushes into the lungs. The lungs get filled with air. During exhalation, ribs move down and inwards, while diaphragm moves up to its former position. This reduces the size of the chest cavity and air is pushed out of the lungs


  5. Q48. Which of the following structures helps the insects in breathing? 1. Spiracles Lungs 3. Trachea 4. Skin Choose the correct code. a. 1 and 2 only b. 2 and 3 only c. 1 and 3 only d. and 4 only


  6. Answer: c Explanation: Insects have small openings called spiracles on their body. These spiracles are connected to a series of air-tubes called trachea. Oxygen rich air rushes through spiracles into the tracheal tubes, diffuses into the body tissue, and reaches every cell of the body. Similarly, carbon dioxide from the cells goes into the tracheal tubes and moves out through spiracles.


  7. Q49. Which of the following organisms breathes through skin? a. Insects b. Earthworms C. Snakes Lizards


  8. Answer: b Explanation: Earthworms breathe through their skin, which feels moist and slimy on touching. Gases can easily pass through it.


  9. Q50. Frogs can respire through Lungs 2. Skin 3. Spiracles 4. Gills Choose the correct code. a. 1 and 2 only b.2 and 3 only c. 1 and 3 only d. and 4 only


  10. Answer: a Explanation: Frogs can breathe through lungs as well as the moist skin.


  11. Q51. Roots of plants take up oxygen for respiration from Atmosphere . ater in the soil a. C. Air in the soil d Roots don't respire


  12. Answer: c Explanation: Roots take up air from the air spaces present between the soil particles.


  13. Answer: c Explanation: Overwatering leads to decreased availability of oxygen to the roots, which depend on soil air for respiration and thus overwatering harms the plant.


  14. Q54. Which of the following organisms do not have a circulatory system? 1.Sponges 2. 3. 4. Snakes Choose the correct code a. b. 1and 3 only C. d. Cockroaches 1 and 2 only 2 and 3 only


  15. Answer: c Explanation: Self-explanatory


  16. Q56. Which of the following organs is not a part of excretory system? a. Ureters b. Urethra C. Penis d. Urinary bladder


  17. Answer: c Explanation: Excretory system consists of kidneys, ureters, urinary bladder and urethra only


  18. Q58. Which of the following organisms and their chief excretory product is correctly matched? Man- uric acid Fish- ammonia Birds urea 3 Choose the correct code a. b. C. d. 2 and 3 only 1 only 2 only 1 and 2 only


  19. Q59. Dialysis is a clinical procedure performed in patients suffering from Kidney failure Heart failure C. Liver failure d. Urea toxicity a.


  20. Q60. Which of the following helps in transport of water and minerals from roots in plants? a. Phloem b. C. Arteries d. Veins Xylem


  21. Answer: b Explanation: The xylem forms a continuous network of channels that connects roots to the leaves through the stem and branches. It transports water and minerals to the entire plant. Phloem transports food prepared by the leaves to all other parts of the plant.