Which among the following produce seeds?

Explain the following terms:
$(a)$ Phanerogams
$(b)$ Symbiosis
$(c)$ Binomial Nomenclature

Fungi are heterotrophic eukaryotic organisms and have a cell wall made of chitin. Name five cell organelles that are present in the fungal cell. Also,state two structural differences between a plant cell and a fungal cell. Which life form occurs due to the association of cells of fungi and algae?

State reasons for the following:
$(a)$ Tapeworm does not have a digestive tract.
$(b)$ Frogs use both skin and lungs for breathing.
$(c)$ Birds have pneumatic/hollow bones.

Organisms having 'pores' all over the body and a canal system for bringing in food and oxygen belong to the phylum:

$A$ well-defined nucleus is absent in