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. Labeo, Chameleon, Salamander Hyla, Rana, Draco Whale, Dolphin, Turtle Hippocampus, Exocoetus, Anabas 2. In which of the following vertebrate group/groups, heart does not pump oxygenated blood to different parts of the body? Amphibians and reptiles Pisces only Amphibians only Pisces and amphibians 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 thick elastic walls, blood flows under high pressure; collect blood from different organs and bring it back to the heart 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 low pressure; carry blood from the heart to various organs of the body 4. The filtration units of kidneys are called nephrons neurons ureter urethra 5. Oxygen liberated during photosynthesis comes from. water chlorophyll carbon dioxide glucose 6. The blood leaving the tissues becomes richer in carbon dioxide water oxygen heamoglobin 7. Which of the following is an incorrect statement? Movement of molecules does not take place among cells Energy is essential for life processes Organisms grow with time Organisms must repair and maintain their structure 8. The internal (cellular) energy reserve in autotrophs is fatty acid protein starch glycogen 9. Which of the following equations is the summary of photosynthesis? 6CO2 + 12H2 O → C6H12O6 + 6O2 + 6H2 O 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 10. Choose the event that does not occur in photosynthesis Reduction of carbon dioxide to carbohydrates Conversion of light energy to chemical energy Absorption of light energy by chlorophyll Oxidation of carbon to carbon dioxide 11. The opening and closing of the stomatal pore depends upon. oxygen temperature water in guard cells concentration of CO2 in stomata 12. Choose the forms in which most plants absorb nitrogen. (i) Proteins (ii) Nitrates and Nitrites (iii) Urea (iv) Atmospheric nitrogen (i) and (ii) (iii) and (iv) (ii) and (iii) (i) and (iv) 13. Which is the first enzyme to mix with food in the digestive tract? Amylase Trypsin Pepsin Cellulase 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 (i) and (iii) (ii) and (iv) (i) and (iv) (ii) and (iii) 15. Lack of oxygen in muscles often leads to cramps among cricketers. This results due to conversion of pyruvate to lactic acid non conversion of glucose to pyruvate conversion of pyruvate to glucose conversion of pyruvate to ethanol 16. Choose the correct path of urine in our body urinary bladder → kidney → ureter → urethra kidney → ureter → urethra → urinary bladder kidney → ureters → urinary bladder → urethra kidney → urinary bladder → urethra → ureter 17. During deficiency of oxygen in tissues of human beings, pyruvic acid is converted into lactic acid in the chloroplast cytoplasm mitochondria golgi body 18. The radiant energy is stored in the from of chemical energy – RNA DNA ATP Stored food 19. Trechea has complete chitinous rings C – shaped cartilaginous rings incomplete cartilaginous rings C – shaped chitinous rings 20 : Total number of ATP molecules formed (net gain) during the process of aerobic respiration is – 42 14 30 38 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
