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. Whale, Dolphin, Turtle Labeo, Chameleon, Salamander Hippocampus, Exocoetus, Anabas Hyla, Rana, Draco 2. In which of the following vertebrate group/groups, heart does not pump oxygenated blood to different parts of the body? Pisces only Amphibians and reptiles Pisces and amphibians Amphibians only 3. Choose the correct statement that describes arteries. They have thick elastic walls, blood flows under low pressure; carry blood 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 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 4. The filtration units of kidneys are called nephrons urethra neurons ureter 5. Oxygen liberated during photosynthesis comes from. glucose water carbon dioxide chlorophyll 6. The blood leaving the tissues becomes richer in heamoglobin oxygen carbon dioxide water 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 must repair and maintain their structure Organisms grow with time 8. The internal (cellular) energy reserve in autotrophs is fatty acid glycogen starch protein 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 Absorption of light energy by chlorophyll Oxidation of carbon to carbon dioxide Reduction of carbon dioxide to carbohydrates Conversion of light energy to chemical energy 11. The opening and closing of the stomatal pore depends upon. oxygen water in guard cells concentration of CO2 in stomata 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 (ii) (i) and (iv) (ii) and (iii) 13. Which is the first enzyme to mix with food in the digestive tract? Trypsin Amylase 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 (ii) and (iii) (i) and (iv) (ii) and (iv) (i) and (iii) 15. Lack of oxygen in muscles often leads to cramps among cricketers. This results due to conversion of pyruvate to ethanol conversion of pyruvate to lactic acid conversion of pyruvate to glucose non conversion of glucose to pyruvate 16. Choose the correct path of urine in our body kidney → ureters → urinary bladder → urethra kidney → urinary bladder → urethra → ureter urinary bladder → kidney → ureter → urethra kidney → ureter → urethra → urinary bladder 17. During deficiency of oxygen in tissues of human beings, pyruvic acid is converted into lactic acid in the cytoplasm mitochondria chloroplast golgi body 18. The radiant energy is stored in the from of chemical energy – DNA Stored food ATP RNA 19. Trechea has C – shaped cartilaginous rings C – shaped chitinous rings complete chitinous rings incomplete cartilaginous rings 20 : Total number of ATP molecules formed (net gain) during the process of aerobic respiration is – 30 42 14 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
