Which of the following is an abiotic component of an ecosystem? MCQ with Answer and Explanation

Explanation:
Lutein and zeaxanthin are carotenoids concentrated in the macula lutea of the retina, filtering blue light and acting as antioxidants, protecting photoreceptors.

Explanation:
Chaperone proteins like BiP assist in proper protein folding in the rough ER. Misfolded proteins are degraded. Golgi modifies, lysosome digests.

Explanation:
Australopithecus (e.g., 'Lucy') is considered one of the earliest direct ancestors or a very close relative of the genus Homo. They were bipedal hominins who lived in Africa about 4 to 2 million years ago. Dryopithecus and Ramapithecus are earlier ape-like ancestors. Homo neanderthalensis was a close relative but is generally considered a separate species that went extinct, though some interbreeding occurred.