Diversity in the Living World

Spirogyra is commonly known as 'pond scum'.

Protenema is the green filamentous growth that arises from spore germination in liverworts and mosses.

The major pigments in class Phaeophyceae is chlorophyll a, c and fucoxanthin.

It is a type of algae that has gametophytic plant body (haploid). It reproduces sexually by gametes which are isogametes that fuse to produce diploid zygote,  which is the only sporophytic generation.

Bryophytes are the plants which produces spores and embryos but they do not have vascular tissue system.

All of them belong to the same class, i.e. green algae.

Bioluminescent algae is a dinoflagellate called noctiluca or sea sparkle.

Isogamous condition with non-flagellated gametes is found in spirogyra.

Chloroplast in Chlamydomonas is cup-shaped. It is one celled structure.

Nostoc belongs to cyanophyceae. In this entire class sexual reproduction is completely absent. It reproduces by colony formation, heterocysts and endospores.

Fucus is a diplontic alga.

The stamens in a flower are collectively called the androecium.

The horizontal stems in ferns are called Rhizomes.

After fertilization, ovary changes into a fruit.

Pteridophytes are called vascular cryptogams.

Coralloid roots are specialized roots found in cycas. They are associated with nitrogen fixing cyanobacteria.

Bryophytes are called the amphibians because they require a layer of water for carrying out sexual reproduction. They grow in the moist places on land but they require water during the time of fertilization, i.e.,  for completion of life cycle.