Question

Use of pesticides to protect our crops affect organisms at various trophic levels especially human beings. Name the phenomenon involved and explain how does it happen.

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.