The pancreas functions as both an exocrine and endocrine gland. Which hormone is secreted by the islets of Langerhans? MCQ with Answer and Explanation

Explanation:
Fertilization in humans typically occurs in the fallopian tube (ampullary region), not the uterus; the zygote then travels to the uterus for implantation. The placenta is the vital organ providing oxygen and nutrients to the growing fetus and removing waste. Spermatogenesis, the production of sperm, occurs in the seminiferous tubules of the testes. Thus, statements 2 and 3 are correct.

Explanation:
Beta-carotene is a precursor of vitamin A (provitamin A) and imparts an orange color to carrots, pumpkins, and sweet potatoes. Lycopene gives red color to tomatoes, chlorophyll is green, xanthophyll is yellow. Beta-carotene is an antioxidant and is important for vision and immune function.

Explanation:
Collenchyma cells have unevenly thickened walls, providing mechanical support and flexibility to growing plant parts like stems. Sclerenchyma consists of dead cells with heavily lignified, thick walls, providing rigid strength to plant parts. Parenchyma cells are living, thin-walled, and serve as the primary packing tissue, storing food, water, and air. All three statements are correct.