The process by which pollen grains are transferred to the stigma is called: MCQ with Answer and Explanation

Explanation:
Luteinizing Hormone (LH) is a gonadotropin secreted by the gonadotroph cells of the anterior pituitary. In females, during the late follicular phase, rising estrogen levels exert positive feedback on the pituitary, causing a massive, sudden surge of LH (the LH surge). This surge directly triggers ovulation (the rupture of the mature Graafian follicle and release of the secondary oocyte) and subsequently stimulates the remaining follicular cells to transform into the corpus luteum, which secretes progesterone.

Explanation:
The cohesion-tension theory (transpiration pull) is the primary mechanism for water ascent in tall trees. Transpiration creates negative pressure (tension) in leaves, water molecules cohere, and the column is pulled up. Root pressure and capillary action play minor roles. The cohesion of water is due to hydrogen bonds.

Explanation:
Folate (B₉) and vitamin B₁₂ are required for DNA synthesis. Deficiency leads to impaired cell division in bone marrow, producing large, immature erythrocytes (megaloblasts), causing megaloblastic anemia. Iron deficiency causes microcytic anemia.