Test-MCQ Class 10-NCERT -Science-Chapter 6-Test-3 Chapter 6: Life Processes Multiple Choice Questions No of Questions : 20 Marks: 20 Please enter your email: 1. Single circulation i.e., blood flows through the heart only once during one cycle of passage through the body, is exhibited by. Hippocampus, Exocoetus, Anabas Hyla, Rana, Draco Whale, Dolphin, Turtle Labeo, Chameleon, Salamander 2. In which of the following vertebrate group/groups, heart does not pump oxygenated blood to different parts of the body? Amphibians only Amphibians and reptiles Pisces and amphibians Pisces only 3. Choose the correct statement that describes arteries. They have thick elastic walls without valves inside, blood flows under high pressure and carry blood away from the heart to different parts of the body. They have thin walls with valves inside, blood flows under low pressure and carry blood away from the heart to various organs of the body They have thick elastic walls, blood flows under high pressure; collect blood from different organs and bring it back to the heart They have thick elastic walls, blood flows under low pressure; carry blood from the heart to various organs of the body 4. The filtration units of kidneys are called neurons urethra nephrons ureter 5. Oxygen liberated during photosynthesis comes from. glucose carbon dioxide chlorophyll water 6. The blood leaving the tissues becomes richer in carbon dioxide water oxygen heamoglobin 7. Which of the following is an incorrect statement? Organisms grow with time Movement of molecules does not take place among cells Energy is essential for life processes Organisms must repair and maintain their structure 8. The internal (cellular) energy reserve in autotrophs is fatty acid protein glycogen starch 9. Which of the following equations is the summary of photosynthesis? 6CO2 + H2 O + Sunlight → C6H12O6 + O2 + 6H2 O 6CO2 + 12H2 O + Chlorophyll + Sunlight → C6H12O6 + 6CO2 + 6H2 O 6CO2 + 12H2 O + Chlorophyll + Sunlight → C6H12O6 + 6O2 + 6H2 O 6CO2 + 12H2 O → C6H12O6 + 6O2 + 6H2 O 10. Choose the event that does not occur in photosynthesis Oxidation of carbon to carbon dioxide Reduction of carbon dioxide to carbohydrates Conversion of light energy to chemical energy Absorption of light energy by chlorophyll 11. The opening and closing of the stomatal pore depends upon. oxygen concentration of CO2 in stomata water in guard cells temperature 12. Choose the forms in which most plants absorb nitrogen. (i) Proteins (ii) Nitrates and Nitrites (iii) Urea (iv) Atmospheric nitrogen (iii) and (iv) (i) and (iv) (i) and (ii) (ii) and (iii) 13. Which is the first enzyme to mix with food in the digestive tract? Cellulase Pepsin Amylase Trypsin 14. Which of the following statement(s) is (are) correct? (i) Pyruvate can be converted into ethanol and carbon dioxide by yeast (ii) Fermentation takes place in aerobic bacteria (iii) Fermentation takes place in mitochondria (iv) Fermentation is a form of anaerobic respiration (ii) and (iv) (i) and (iv) (i) and (iii) (ii) and (iii) 15. Lack of oxygen in muscles often leads to cramps among cricketers. This results due to non conversion of glucose to pyruvate conversion of pyruvate to lactic acid conversion of pyruvate to glucose conversion of pyruvate to ethanol 16. Choose the correct path of urine in our body kidney → ureters → urinary bladder → urethra urinary bladder → kidney → ureter → urethra kidney → ureter → urethra → urinary bladder kidney → urinary bladder → urethra → ureter 17. During deficiency of oxygen in tissues of human beings, pyruvic acid is converted into lactic acid in the cytoplasm chloroplast mitochondria golgi body 18. The radiant energy is stored in the from of chemical energy – Stored food DNA RNA ATP 19. Trechea has C – shaped cartilaginous rings C – shaped chitinous rings incomplete cartilaginous rings complete chitinous rings 20 : Total number of ATP molecules formed (net gain) during the process of aerobic respiration is – 30 14 38 42 Please Enter Your Name, School Name & Class in the given below box and submit: ( Result will show immediately after submit) Loading … Question 1 of 21
