Question

Which is the character of Rhodophyceae?
(a) Major pigments are Chl a and b.
(b) Commonly called brown algae.
(c) Stored food is mannitol and laminarin.
(d) Flagella are absent.
(e) Cell wall contains cellulose and algin.

Answer 1

Hint: These are microscopic hair-like structures responsible for the locomotion of a cell. The members of the family Rhodophyceae lack lash-like structures that are responsible for the movement of the cell. They are also used as sensory organs to sense the changes in pH and temperature in some organisms.

Complete answer:
Rhodophyceae is also known as red algae. They may be unicellular or multicellular. In Rhodophyceae, the flagellated motile stages are totally absent. In Rhodophyceae reproduction occurs by means of vegetative propagation, asexual and sexual reproduction. During fertilization, with the help of water current, the spermatium comes in contact with the trichogyne.
-${ 98 }$% of Rhodophyceae are marine and only ${ 2 }$% of these species grow in freshwater.
-These species can grow as saprophytes, parasites, and also as epiphytes.
-The unicellular form of red algae usually reproduces vegetatively by fragmentation.
-They reproduce asexually by non-motile spores like monospores, neutral spores, carpospores, inspires, and tetraspores.
-They reproduce sexually by non-motile gametes. Spermatangium is the male sex organ of red algae.
-In each spermatangia single, non- flagellated male gametes are produced.
-Carpogonia or pro carp is the female sex organ of red algae. These are flask-shaped with a long neck called trichogyne.
-ln Rhodophyceae, Floridian starch, floridi-side, and nannoglycerate are reserved foods.
-In Rhodophyceae outer pectic and inner cellulosic layers are the components of the cell wall.
-Pits are present in the cell wall of multicellular forms of Rhodophyceae.
-Both chlorophyll a and chlorophyll d are the photosynthetic pigments of Rhodophyceae.
-The red color of Rhodophyceae is due to the presence of a sufficient amount of r- phycoerythrin which completely masks the chlorophyll a.

So, the correct answer is,’ Flagella are absent’.

Note:
-The unicellular form of red algae usually reproduces vegetatively by fragmentation.
-They reproduce asexually by non-motile spores like monospores, neutral spores, carpospores, inspires, and tetraspores.
-They reproduce sexually by non-motile gametes. Spermatangium is the male sex organ of red algae.