Explain the process of pollination in vallisneria. How is it different in water-lily, which is also an aquatic plant?
In vallisneria, the female flower reach the surface of water by the long stalk and the male flower or pollen grains are released into the surface of water. They are carried by water currents reaching the female flowers and the stigma.
In Water lily pollination takes place through wind or insect, female flower imerges above the surface of water and gets pollinated.
Fill in the blanks:
(a) Humans reproduce __________. (asexually/sexually)
(b) Humans are__________. (oviparous/viviparous/ovoviviparous)
(c) Fertilization is __________ in humans. (external/internal)
(d) Male and female gametes are __________. (diploid/haploid)
(e) Zygote is __________. (diploid/haploid)
(f) The process of release of the ovum from a mature follicle is called__________.
(g) Ovulation is induced by a hormone called the __________.
(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 fetus and uterus is called ____________.