Reproduction

Hydra reproduces asexually through budding, where a small outgrowth (bud) develops on the parent body, detaches, and grows into a new individual.

Vegetative reproduction is the development of a new plant from any vegetative part (stem, root, leaf, etc.) without involving seeds or sexual reproduction. Examples include growing plants from cuttings or tubers.

Micropropagation is a tissue culture technique where plant tissues or cells are grown in a sterile culture medium to produce many genetically identical plants (clones) rapidly.

When pollen grains land on the stigma of the same flower, it is called autogamy or self-pollination. This is different from cross-pollination where pollen from one flower fertilizes another.

Ova (eggs) are produced in the ovaries through the process of oogenesis. The ovaries contain follicles that house and develop the ova before ovulation.

During fertilization in flowering plants, the pollen tube carries exactly two male gametes. One gamete fuses with the egg cell to form the zygote, while the other fuses with the polar nuclei to form endosperm - a process called double fertilization.

Ovulation is the process where a mature ovarian follicle ruptures and releases the ovum (egg) from the ovary. This typically occurs around day 14 of a 28-day menstrual cycle.

Sperm maturation requires a temperature 2-3°C lower than core body temperature. This is why testes are located in the scrotum outside the abdominal cavity.

The average human gestation period is 280 days (40 weeks) from last menstrual period. This is the standard duration used in medical practice.

Female reproductive organs typically mature between 10-13 years, with menarche (first menstruation) occurring around 12-13 years on average. This marks the onset of reproductive capability.

Secondary sexual characteristics develop during puberty under hormonal influence. In females, breast development is a key secondary sexual characteristic, while the ovary is a primary reproductive organ.

Fertilization occurs in the fallopian tube (oviduct), where the sperm meets and penetrates the ovum. The fertilized zygote then travels to the uterus for implantation.

The testes are composed of numerous coiled seminiferous tubules, which are the site of spermatogenesis (sperm production). Other options are kidney structures.

The prostate gland is an accessory gland in the male reproductive system that secretes fluid constituting part of semen. The testes are primary organs, epididymis is for sperm storage, and 'phallic gland' is not a standard anatomical term.

Vasectomy is a surgical contraception method where a small portion of the vas deferens is cut or sealed to prevent sperm transport. Tubectomy involves the fallopian tubes in females.

 Progestrone is secreted by corpus luteum.

The anther is the pollen-bearing part of a stamen in flowering plants. It contains pollen grains which are the male gametophytes. Sepals are floral leaves, ovules are in the ovary, and carpel is the female reproductive structure.

The testes descend into the scrotum to maintain a temperature 2-3°C lower than abdominal cavity temperature. This lower temperature is essential for normal spermatogenesis and fertility.

Mucor is a fungus that reproduces asexually through spore formation (specifically sporangiospores produced in sporangia). Budding and binary fission are seen in yeasts, and fragmentation is another fungal method.

Sweet potato is propagated vegetatively through its modified roots called tubers. These tubers contain buds that can grow into new plants, making roots the correct site for vegetative propagation. Other plant parts like stems, leaves, or flowers are not used for sweet potato propagation.

AIDS (Acquired Immunodeficiency Syndrome) is primarily transmitted through sexual contact, along with other modes like blood transfusion and mother-to-child transmission. The other options listed - cancer, tuberculosis, and diabetes - are non-communicable diseases or spread through different routes, not primarily sexual contact.

The placenta is the special organ that forms the connection between the fetus and the mother's uterus, allowing for nutrient and gas exchange. Fertilization is the fusion of gametes, implantation is when the embryo attaches to the uterus, and ovulation is the release of an egg - none of these represent the ongoing fetal-mother connection.

The cessation of menstrual cycle is called menopause.

Sperms achieve motility and maturity in seminal vesicle.