Question

Read the following statements and choose the correct option
A. The members of chlorophyceae are usually grass green in colour due to dominance of pigments chlorophyll a and b.
B. In red algae complex post fertilisation development occurs.

a. Only statement A is correct
b. Only statement B is correct
c. Both statement A and B are correct
d. Both statement A and B are incorrect

Answer 1

Hint: Chlorophyll A uptakes light from the orange-red and violet-blue regions of the electromagnetic spectrum. Chlorophyll A shifts energy to the reaction center and gives two excited electrons to the electron transport chain. Organisms can soak up more energy from the higher frequency blue light part of the spectrum. The occurrence of chlorophyll B in cells helps organisms convert a broader range of energy from the sun into chemical energy.

Complete answer:
The chief pigment of Chlorophyceae are chlorophylls a and b; those lead over α-and β-carotenes and xanthophylls. Phycobilins are not present. The reserve food is starch, composed of amylose and amylopectin

The vital role of chlorophyll A is as a major electron donor in the electron transport chain. From there on, the energy from the sun will eventually become chemical energy that can be utilized by the organism for cellular processes.

The members of Chlorophyceae are usually called green algae. The body of the plant may be unicellular, colonial, or filamentous. They are generally grass-green due to the supremacy of pigments chlorophyll a and b.

Typically for Red algae is that no motile stage happens during the complete life cycle. The spores and gametes are passively transported by the water. In sexual reproduction, only oogamy is observed. Oogamy is a type of anisogamy (unequal gametes) in which the egg cell is large and non-motile, as compared to the sperms.

Hence, the correct answer is option (A).

Note: In red algae, the egg cell becomes a female gametangium, called carpogonium. It is now that fertilization occurs. The sperms are formed in an own spermatangium (male gametangium), but devoid of an own motility apparatus. So in the chlorophyceae pigment both chlorophyll, a, and b are present. Due to chlorophyll a and b dominance, the pigments are usually grass-green.