Question

In flowering plants, the pollen grains are transferred to stigma by pollination but the female germ cells are present in the ovary. Explain with the help of a labelled diagram, how the male germ cell reaches the ovule.

Mention the pathway travelled by sperm, from testes to the fallopian tube of female.

Will the levels of Biological magnification be different at different levels of the ecosystem? Give example.

A village is located on the bank of the river. For daily activities like drinking, bathing, and irrigation the local community of the village depends on that river. Some people in the village use several pesticides for cropping. However, in recent years, the level of pollution has risen considerably and the water is now contaminated with chemicals from nearby factories, untreated sewage, and plastic waste. As a result, the villagers suffer from many diseases caused by polluted water.