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 _____________


(a) sexually


Explanation: Sexual reproduction – is a process by which a new individual from two parents are formed.


(b) viviparous


Explanation: Viviparous – are those types of animals which reproduce, develop, nourishes and give birth to live young ones.


(c) internal


Explanation: Internal Fertilization - is defined as the union of an egg cell with a sperm during sexual reproduction which occurs inside the body of a parent.


(d) haploid


Explanation: Haploid gametes – human reproduce sexually which involves joining together of haploid gamete cells from each parent with half the normal number of chromosomes.


(e) diploid


Explanation: Diploid – human reproduces sexually, which involves joining of cells containing half the normal number of chromosomes from each parent to make a new cell containing exact number of chromosomes from both parents, these cells from each parent then combine to form the zygote which are also called diploid gametes.


(f) ovulation_


Explanation: Ovulation is a phase in women when the egg moves from the ovaries into fallopian tubes to attain fertilization stage.


(g) luteinizing hormone_


Explanation: Luteinizing hormone - is a hormone which is secreted by the anterior pituitary gland, whose function is to stimulate ovulation in females and synthesizes androgen in males.


(h) fertilization___


Explanation: Fertilization – is a process in which two gametes unite keeping the somatic chromosome number intact with the initiation of developing a new individual.


(i) fallopian tube_


Explanation: Fallopian tube – are tubes which carries the egg from ovary to uterus. They are two in numbers for each ovaries.


(j) blastocyst


Explanation: Blastocyst – during the early development of mammals astructure is formed called blatocyst, which possesses an inner cell mass (ICM) that forms the embryo.


(k) placenta


Explanation: Placenta – is an organ which connects mother and the fetus internally, it connets to the uterine wall to allow uptake of nutrients, thermo-regulation, waste elimination and gas exchange through mother’s blood, it also fights internal infection and produces hormones which supports the pregnancy. The unbillical cord develops from placenta.


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