Biology Practice: Photosynthesis & Respiration (Mock Test 4 - Expert)
1. In an experiment, a student places a plant in a sealed glass jar with a burning candle. After some time, the candle continues to burn. This proves that:
2. Clinical Logic: Why do athletes experience "Oxygen Debt" during a heavy sprint?
3. A variegated leaf (like Coleus) is tested for starch. Only the green parts turn blue-black. This experiment proves:
4. Why is it dangerous to sleep under a large tree at night?
5. Experimental Setup: Two flasks contain germinating seeds. Flask A has living seeds; Flask B has boiled (dead) seeds. A thermometer in Flask A shows a rise in temperature. Why?
6. If a plant is given water containing a radioactive isotope of Oxygen ($^{18}O$), which product of photosynthesis will be radioactive?
7. A student observes that a submerged aquatic plant (Hydrilla) produces more bubbles when a light source is brought closer. This indicates:
8. What is the metabolic consequence of waterlogging in crop plants?
9. During the starch test, why is a leaf dipped in hot water after being boiled in alcohol?
10. Why do the inner membranes of mitochondria (cristae) have so many folds?
11. In the $CO_2$-necessity experiment, what happens if we use a plant that hasn't been destarched?
12. Why is the "Dark Reaction" a misnomer (misleading name)?
13. Which of the following describes the relationship between photosynthesis and respiration in the "Carbon Cycle"?
14. What would be the effect of removing the "Lenticels" from a woody stem?
15. Why does yeast lose weight during fermentation in a closed sugar solution?
16. Photosynthesis is a "Redox" reaction. What is reduced and what is oxidized?
17. In a greenhouse, why do farmers sometimes burn paraffin lamps at night?
18. The term "Glycolysis" literally means:
19. Why do plants produce "Secondary Metabolites" if photosynthesis is only for food?
20. What is the fundamental difference in the use of 'Water' between photosynthesis and respiration?
