In the female reproductive system, fertilization normally occurs in the: MCQ with Answer and Explanation

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:
Graves' disease is an autoimmune condition where the immune system produces thyroid-stimulating immunoglobulins (TSIs). These autoantibodies bind to and mimic the action of Thyroid Stimulating Hormone (TSH) on the TSH receptors of the thyroid gland. This continuous, unregulated stimulation causes the thyroid to overproduce thyroid hormones (T3 and T4), leading to hyperthyroidism, goiter, and often exophthalmos (bulging eyes).

Explanation:
Vitamin A (retinal) combines with opsin to form rhodopsin in rod cells, necessary for vision in dim light. Deficiency causes night blindness. B₁ is for carbohydrate metabolism, C for collagen, D for calcium.