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How do Organisms Reproduce?
(a) Write the function of following parts in the human female reproductive system :
(i) Ovary (ii) Oviduct (iii) Uterus
(b) (a) Write the function of following parts in the human female reproductive system :
(i) Ovary (ii) Oviduct (iii) Uterus
(b) Describe in brief the structure and function of the placenta
(a)
(i) The ovaries have two main reproductive functions in the body. They produce eggs for fertilization and they produce the reproductive hormones, oestrogen and progesterone.
(ii) Oviduct known as fallopian tube help transmission the ova from the ovary to the uterus and providing the necessary environment for fertilization and for initial development of the egg or zygote.
(iii) Uterus help in nurturing the fertilized ovum that develops into the fetus and holding it till the bady is mature enough for birth.
(b) Th placenta provides a large surface area for glucose and oxygen to pass from the mother to the embryo. The waste substances generated by the foetus is removed by transferring them into the mother’s blood through the placenta.
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What happens when :
Accidently, Planaria gets cut into many pieces?
What happens when :
Bryophyllum leaf falls on the wet soil?
What happens when :
On maturation sporangia of Rhizopus bursts?
State the changes that take place in the uterus when :
Implantation of the embryo has occurred.
State the changes that take place in the uterus when :
Female gamete/egg is not fertilised
Name the organ that produces sperms as well as secretes a hormone in human males. Name the hormone it secretes and writes its functions.
Name the parts of the human female reproductive system where fertilisation occurs.
Explain how the developing embryo gets nourishment inside the mother's body.
A student while observing an embryo of a gram seed listed various parts of the embryo as listed below :
Testa, Micropyle, Cotyledon, Tegmen, Plumule, Radicle. On examining the list the teacher commented that only three parts are correct. Select these three correct parts :
Name the type of asexual reproduction in which two individuals are formed from a single parent and the parental identity is lost. Write the first step from where such a type of reproduction begins. Draw first two stages of this reproduction.
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