Energy Sources and Utilization — NEET Biology
📚 Practice ConceptAll living organisms need energy for carrying out daily life activities, be it absorption, transport, movement, reproduction or even breathing. Where does all this energy come from? We know we eat food for energy – but how is this energy taken from food? How is this energy utilised? Do all foods give the same amount of energy? Do plants 'eat'? Where do plants get their energy from? And micro-organisms – for their energy requirements, do they eat 'food'?
Which of the following statements are correct regarding the movement of gases in plants? S1. Simple diffusion is the predominant mechanism for gas exchange between the plant and its environment. S2. The presence of an interconnected network of air spaces within plant tissues facilitates efficient gas diffusion. S3. Gases are primarily transported against their concentration gradients through active transport in plants. S4. Diffusion distances for gases are significantly large in most plant living cells, necessitating bulk flow mechanisms. S5. Stomata and lenticels are structures that enhance the rate of gas diffusion by providing direct openings to the atmosphere.
View solution & NCERT explanation
Correct answer: A — S1, S2, and S5
The question examines the mechanism of gas movement in plants and associated structural features. S1: Correct. Simple diffusion, driven by concentration gradients, is the primary mode of gas exchange in plants. (Implicit from NCERT, confirmed by general biological principles and context of gas exchange through stomata/lenticels). S2: Correct. The loose packing of parenchyma cells creates an interconnected network of air spaces, which aids in efficient gas diffusion throughout the plant. (NCERT Page 155, Para 1) S3: Incorrect. Gas movement in plants occurs via diffusion, which is a passive process down a concentration gradient, not active transport. (Implied by NCERT context of gas exchange). S4: Incorrect. The diffusion distances for gases in plants are typically not great, as living cells are generally close to the surface, and air spaces facilitate movement. Bulk flow is not required for gas movement. (NCERT Page 155, Para 1) S5: Correct. Stomata and lenticels are specialized pores that provide direct pathways for gases to diffuse between the plant interior and the atmosphere. (NCERT Page 154, Para 4) Statements S1, S2, and S5 are correct. Thus, option A is the correct answer. The efficient gas exchange in plants relies on passive diffusion facilitated by internal air spaces and surface openings.
What does NCERT say about All living organisms need?
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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.