If you are asked to classify the various algae into distinct groups, which of the following characters you should choose?

Which cells within the microsporangia undergo meiosis and produce microspores.

Archegonium is absent in

Assertion: Red algae contribute in producing coral reefs.
Reason: Some red algae secrete and deposit calcium carbonate over their walls.

After fertilization the zygote of a seed plant becomes

A pine seed has cotyledons and tissue from the ______.

Which of the following is commonly called as pond scum ?

External fertilization occurs in majority of

In a seed-bearing plant the megaspore develops/grows into

A prokaryotic autotrophic nitrogen fixing symbiont found in