Energy Storage in Chemical Bonds — NEET Biology
📚 Practice ConceptLiving organisms have the capability of extracting energy from oxidisable substances and store this in the form of bond energy. Special substances like ATP, carry this energy in their chemical bonds. The process through which
Which of the following statements correctly describe the role of sunlight as the ultimate energy source for most living forms on Earth? S1: Sunlight directly provides energy for all metabolic activities in both plants and animals. S2: Green plants convert solar energy into chemical energy through photosynthesis, forming the foundation of energy flow in ecosystems. S3: The chemical energy stored in organic compounds produced by plants is transferred to heterotrophs through food chains. S4: Sunlight stimulates the release of CO2 from heterotrophs, thereby directly supporting carbon fixation in plants. S5: The intensity of sunlight dictates the rate of all enzymatic reactions in organisms, irrespective of their nutritional mode.
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Correct answer: B — S2 and S3 are correct
This question addresses the fundamental role of sunlight in sustaining life on Earth through its connection with photosynthesis. S1: This statement is NOT correct. While plants directly use solar energy for photosynthesis, animals (heterotrophs) obtain their energy from the chemical energy stored in the food they consume, not directly from sunlight for their metabolic activities. S2: This statement is correct. "Ultimately, all living forms on earth depend on sunlight for energy. The use of energy from sunlight by plants doing photosynthesis is the basis of life on earth." This process converts solar energy into chemical energy in organic compounds. S3: This statement is correct. The organic compounds (food) synthesized by plants contain chemical energy, which is then transferred to heterotrophs (consumers) when they ingest plants or other heterotrophs, thus establishing food chains. S4: This statement is NOT correct. Sunlight doesn't directly stimulate CO2 release from heterotrophs; CO2 is released as a product of respiration. While plants use CO2 for fixation, the direct relationship described in the statement is inaccurate. S5: This statement is NOT correct. The intensity of sunlight mainly affects photosynthetic reactions and some physiological processes, but it does not dictate the rate of 'all enzymatic reactions' in organisms, many of which are temperature-dependent or substrate-dependent. Therefore, S2 and S3 are correct.
What does NCERT say about Living organisms have capability?
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Through deep analysis of NEET and NTA, 176 of the 180 ReNEET 2026 (June 21) questions were already in the MedicNEET question bank before the exam.
176/180MedicNEET's Biology question bank is built from the same NCERT lines NTA picks repeatedly. Not random MCQs — questions crafted exactly like NTA crafts them.