Choose the correct answer from the options given below:
Natural selection may produce stabilising, directional or disruptive selection. Genetic drift is a random change in allele frequency and is not caused by natural selection.
Which of the following structures is not a part of the male reproductive system?
The infundibulum is the funnel-shaped part of the female oviduct. Rete testis, epididymis and vasa efferentia are parts of the male reproductive system.
Choose the correct answer from the options given below:
The Amazonian rain forest contains about 1,25,000 invertebrate species, 40,000 plant species, 3,000 fish species, 1,300 bird species and 427 mammal species.
Statement I: Ovulation is caused by an LH surge leading to rupture of the Graafian follicle.
Statement II: The Graafian follicle remaining after ovulation transforms into the corpus luteum and secretes a large amount of estrogen.
In the light of the above statements, choose the most appropriate answer from the options given below:
The LH surge induces rupture of the Graafian follicle and ovulation. The remaining follicular tissue forms the corpus luteum, which primarily secretes a large amount of progesterone.