Which of the following is incorrect about hemoglobin?
Hemoglobin contains iron, which binds to oxygen for transport in the blood.
Ref: NCERT Class 11 Biology Chapter 15: Body Fluids and Circulation Blood - Plasma and Formed Elements
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Which of the following is correct about RBCs?
RBCs have a lifespan of around 120 days and are responsible for oxygen transport.
Ref: NCERT Class 11 Biology Chapter 15: Body Fluids and Circulation Blood - Plasma and Formed Elements
Which of the following is *not* a type of mutualism?
Defensive, resource-based, and dispersive interactions are functional classes of mutualism because each identifies a reciprocal exchange that raises both partners’ fitness. In defensive mutualism, one partner receives protection while the defender obtains food or shelter, as in many ant–plant systems. Resource-based mutualism involves exchange of complementary resources, exemplified by plant carbon traded for fungal mineral nutrients in mycorrhizae. Dispersive mutualism includes pollination and seed dispersal: animals receive nectar, pollen, or fruit while moving plant gametes or propagules. C
Ref: Ecology: From Individuals to Ecosystems, Begon et al., 5th Ed., Ch. 8-13
Which of the following represents the first law of thermodynamics?
ΔE = q + w accurately defines or describes the concept asked in this question. Within Thermodynamics, precise definitions and terminology are essential for clear scientific communication. The other options (ΔG = ΔH - TΔS, ΔS = k ln Ω, and q = mCΔT) either describe related but distinct concepts, use incorrect terminology, or confuse similar-sounding terms that have different scientific meanings. A thorough understanding of exact definitions helps distinguish between closely related biological concepts and is crucial for competitive examinations.
Ref: Lehninger Principles of Biochemistry, Nelson & Cox, 8th Ed., Ch. 1
