Charles Darwin proposed the theory of evolution by: MCQ with Answer and Explanation

Explanation:
Approximately 97% of O₂ is transported bound to hemoglobin (as oxyhemoglobin), while only 3% is dissolved in plasma. Each hemoglobin molecule can bind four O₂ molecules cooperatively. CO₂ is mainly transported as bicarbonate (70%), carbaminohemoglobin (23%), and dissolved (7%). The affinity of hemoglobin for O₂ is influenced by pH, CO₂, and temperature (Bohr effect).

Explanation:
Golden Rice is a transgenic variety of rice (Oryza sativa) engineered to produce beta-carotene, a precursor of Vitamin A, in the edible endosperm. The beta-carotene gives the rice grains a characteristic golden-yellow color. It was developed to address Vitamin A deficiency (VAD), a major public health issue in developing countries that causes blindness and increases susceptibility to infectious diseases in children.

Explanation:
Adrenocorticotropic hormone (ACTH) from the anterior pituitary stimulates the adrenal cortex to produce cortisol and androgens. TSH stimulates thyroid, FSH gonads.