Fill in the blanks: (a) Humans reproduce ...

Fill in the blanks: (a) Humans reproduce ____ (asexually/sexually) (b) Humans are ____ (oviparous, viviparous, ovoviviparous) (c) Fertilisation is ____ in humans (external/internal) (d) Male and female gametes are ____ (diploid/haploid) (e) Zygote is ____(diploid/haploid) (f) The process of release of ovum from a mature follicle is called ____. (g) Ovulation is induced by a hormone called ____. (h) The fusion of male and female gametes is called ____. (i) Fertilisation takes place in ____. (j) Zygote divides to form ____ which is implanted in uterus. (k) The structure which provides vascular connection between foetus and uterus is called ____.

Fill in the blanks:
(a) Humans reproduce ____ (asexually/sexually)
(b) Humans are ____ (oviparous, viviparous, ovoviviparous)
(c) Fertilisation is ____ in humans (external/internal)
(d) Male and female gametes are ____ (diploid/haploid)
(e) Zygote is ____(diploid/haploid)
(f) The process of release of ovum from a mature follicle is called ____.
(g) Ovulation is induced by a hormone called ____.
(h) The fusion of male and female gametes is called ____.
(i) Fertilisation takes place in ____.
(j) Zygote divides to form ____ which is implanted in uterus.
(k) The structure which provides vascular connection between foetus and uterus is called ____.

Key Concepts

Hormonal Regulation in Reproduction

Hormonal regulation plays a pivotal role in controlling reproductive processes. For instance, the luteinizing hormone (LH) is key in inducing ovulation and coordinating other functions necessary for successful reproduction.

Placenta

The placenta is an essential organ that develops during pregnancy, providing a vascular connection between the mother and the developing fetus. It facilitates the exchange of nutrients, gases, and waste products, supporting fetal growth and sustaining pregnancy.

Blastocyst Formation

After fertilisation, the zygote undergoes rapid cell division to form a blastocyst, a structure composed of an outer layer and a group of inner cells. The blastocyst is responsible for implantation into the uterine wall, which initiates further development of the embryo.

Ovulation

Ovulation is the biological process in which a mature ovarian follicle releases an ovum into the fallopian tube. It is an essential event in the menstrual cycle, setting the stage for potential fertilisation.

Internal Fertilisation

Internal fertilisation is the process where sperm meets egg inside the reproductive tract of the female. This method enhances the chances of successful fertilisation by providing a controlled environment and is characteristic of many higher organisms, including humans.

Gametogenesis and Gamete Ploidy

Gametogenesis is the process by which gametes are produced, involving meiosis which reduces the chromosome number from diploid to haploid. Both male and female gametes are haploid, ensuring that upon fertilisation, the zygote restores the diploid state.

Viviparity

Viviparity is a mode of reproduction in which the developing embryo is retained within the body of the parent, receiving nourishment directly from the mother. This method allows for a protected developmental environment and results in live birth.

Sexual Reproduction

Sexual reproduction involves the fusion of haploid gametes from two different individuals to create a genetically unique offspring. It introduces genetic variability crucial for evolution and involves processes such as gametogenesis, fertilisation, and embryonic development.

Fertilisation Process

The fertilisation process is the fusion of two haploid gametes (sperm and ovum) that results in the formation of a diploid zygote. This union is a critical step in sexual reproduction and marks the beginning of embryonic development.

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