What is the basis of classification of algae?
Algae are classified on the following factors:
(a) Major photosynthetic pigments present.
(b) Form of stored food.
(c) Cell wall composition.
(d) Number of flagella and position of insertion.
(e) Habitat.
Name three groups of plants that bear archegonia. Briefly describe the life cycle of any one of them.
When and where does reduction division take place in the life cycle of a liverwort, a moss, a fern, a gymnosperm and an angiosperm?
Mention the ploidy of the following: protonemal cell of a moss; primary endosperm nucleus in dicot, leaf cell of a moss; prothallus cell of a ferm; gemma cell in Marchantia; meristem cell of monocot, ovum of a liverwort, and zygote of a fern.
Write a note on economic importance of algae and gymnosperms.
