Question

Identify the diagrams.

A. (i) – Porphyra, (ii) – Polysiphonia, (iii) – Chara, (iv) – Dictyota
B. (i) – Polysiphonia, (ii) – Porphyra, (iii) – Chara, (iv) – Ectocarpus
C. (i) – Laminaria, (ii) – Polysiphonia, (iii) – chlamydomonas, (iv) – Fucus
D. (i) – Dictyota, (ii) – Polysiphonia, (iii) – Chara, (iv) – Porphyra

Answer 1

Hint: In the images given above, three of the organisms are a type of algae and one of them is seaweed. One of them grows in seawater, one is found on coastal rocks, one is found in freshwaters of temperate zones, and one is found in a natural pool like water bodies. All the species belong to different families.

Complete answer:
Porphyra:
It is a kind of red algae that is found in shallow portions in seawater. In the earlier stages, it is green in colour and becomes brownish-red as it matures. It is irregular in shape and has a small thallus. It can grow up to 20 cm. It is generally found to be attached to the rocks.

Polysiphonia:
It is also a type of red algae. They are found in the marine environment, attached to the rocks. This species is multiaxial and the thallus is well-branched. They can grow up to 30 cm in length.

Chara:
It is a type of green algae. They are found in freshwaters, attached to the muddy surface. They look similar to a typical plant with a stem and leaf-like structures. It thrives in less oxygenated waters.

Dictyota:
It is a type of seaweed that is found in rocky ponds or pools. It has a flat thallus with many dichotomous branches. It is goldish-brown and translucent in appearance.

Hence, the correct answer is option (A). Here Porphyra, Polysiphonia, and Chara are different types of algae, whereas Dictyota is a seaweed.

Note: Ectocarpus is a type of brown algae that is highly filamented. It is a free-floating alga and found throughout the world.
Laminaria, also known as kelp, is a type of brown algae. It is large in size and has long and leathery laminae.
Fucus is also a brown algae and is found on rocky seashores. The thallus is disc-shaped and perennial.