How does the embryo get nourishment inside the mother’s body?
Embryo gets nourishment from mother’s body with the help of placenta through a cord called umbilical cord. Placenta contains many finger-like villi from the chorion covering of the embryo. This occurs in contact with blood sinuses of the mother present in the endometrial lining of uterus. All nutrients (glucose, amino acids, vitamins, etc.) diffuse from mother’s blood into villi and from there to embryo through the umbilical cord.
How are the young ones of frogs and other aquatic animals produced?
Draw and describe the male reproductive organs in humans.
Two very small organisms X and Y both reproduce by the method of budding. Organism X is industrially very important because it is used in making alcohol from sugar. It is also used in making bread. Organism Y is a tiny animal having tentacles which lives in water.
(a) What is organism X?
(b) Name the process in which X converts sugar into alcohol.
(c) To which class of organism does X belong?
(d) What is organism Y?
(e) Out of X and Y, which organism is multicellular and which one is unicellular?
Draw a diagram of human reproductive organs and label sperm duct, penis and testis .
