Identify the INCORRECT statement about the human body: MCQ with Answer and Explanation

Explanation:
Birds and mammals are endothermic (warm-blooded), maintaining a constant internal body temperature regardless of the environment. Crow is a bird, hence warm-blooded. Fish, frog (amphibian), and snake (reptile) are ectothermic (cold-blooded), their body temperature varies with the environment. Endothermy requires high metabolic rate and insulation (feathers, fur).

Explanation:
Cloning produces genetically identical copies of an organism or cell. In animals, somatic cell nuclear transfer (like Dolly the sheep) is used. Plant cloning occurs via vegetative propagation or tissue culture. Hybridization combines different genomes; mutation breeding induces mutations; cross breeding involves mating. Cloning has applications in therapeutics, conservation, and agriculture.

Explanation:
Vitamin A (Retinol) is essential for the formation of rhodopsin (visual purple), a pigment in the rod cells of the retina necessary for vision in low light conditions. Deficiency of Vitamin A leads to night blindness (nyctalopia), where a person has difficulty seeing in dim light. Severe deficiency can also cause xerophthalmia and complete blindness.