Brood Parasitism and Coevolution — NEET Biology

Correct answer: A — S1, S3 and S4 only

The question assesses knowledge of various adaptations and defense mechanisms found in organisms involved in interspecific interactions like predation and parasitism, as described in NCERT. S1: Correct. NCERT states that 'Some species of insects and frogs are cryptically-coloured (camouflaged) to avoid being detected easily by the predator.' S2: Incorrect. NCERT mentions 'Thorns (Acacia, Cactus) are the most common morphological means of defence.' They are morphological, not chemical, defenses. S3: Correct. NCERT states, 'The Monarch butterfly is highly distasteful to its predator (bird) because of a special chemical present in its body. Interestingly, the butterfly acquires this chemical during its caterpillar stage by feeding on a poisonous weed.' S4: Correct. NCERT describes parasite adaptations including 'loss of unnecessary sense organs, presence of adhesive organs or suckers to cling on to the host, loss of digestive system and high reproductive capacity.' S5: Incorrect. NCERT states that in brood parasitism, 'the eggs of the parasitic bird have evolved to resemble the host’s egg in size and colour to reduce the chances of the host bird detecting the foreign eggs and ejecting them from the nest.' The eggs evolve to *resemble*, not be distinct from, the host's eggs. Therefore, statements S1, S3, and S4 are correct. Option 'B' correctly identifies S1, S3, and S4 as correct. Other options include incorrect statements or omit correct ones. This concept highlights how organisms adapt to survive and reproduce within complex ecological interactions.