Human Reproductive System

The generative nucleus in the pollen tube divides mitotically to form two male gametes, which move toward the tube tip. The tube nucleus guides tube growth but doesn't form gametes. Zygote and embryo form after fertilization.

One male gamete fuses with the egg cell to form the diploid zygote (2n), which develops into the embryo. The other male gamete fuses with polar nuclei to form the endosperm nucleus. Tube and generative nuclei are pollen structures, not fertilization products.

Triple fusion refers to the fusion of one male gamete with the two polar nuclei in the embryo sac, forming a triploid primary endosperm nucleus. This is the second fertilization event in double fertilization. The zygote forms from the first male gamete fusing with the egg cell.

 Epididymis is a part of male reproductive system and is a tightly coiled tube connecting the efferent ducts from each testicle to vas deferens

 Inguinal canal in anterior abdominal wall allows passage of spermatic cord in males and round ligament in females

Bindin is a species-specific protein found on the acrosomal process of sperm that recognizes and binds to receptors on the egg's vitelline membrane. This mechanism ensures that fertilization occurs only between gametes of the same species.

Hematocele is an effusion of blood into the tunica vaginalis of testis.

Kallmann syndrome is an example of secondary hypogonadism. 

In meiosis, one diploid parent cell undergoes division to produce four haploid gametes. To produce 100 gametes, 100 divided by 4 equals 25 parent cells.

Obturators are specialized structures that guide the pollen tube towards the micropyle during fertilization. They are typically outgrowths of the funicle or placenta in certain plant families.

Muscle contractions are vigorous and towards uterus at this time.

This is the correct option as it is a false statement. 

The changes which occur at adolescence are controlled by hormones.

This is the correct option. 

This is the correct option.