Question

Choose the correct answers from the alternatives given.
Red algae differ from green algae and brown algae in having:
a. No chlorophyll A
b. No differentiated cells
c. Haemoglobin within their cells
d. No flagellated stage in their life cycles

Answer 1

All of the three algae are capable of producing their own food with the help of photosynthesis meaning that all of them are having chlorophyll inside them and hemoglobin is mostly associated with the functioning and transport of blood.

Complete answer:
We all know that the algae are known for producing their own food and they do not depend on anyone to provide them food. So, if they are capable of producing their own food then it means that they definitely contain all the machinery and pigment required. Thus, we can say that all the algae have chlorophyll present inside them.

The red algae, green algae, and the brown algae are able to produce their own food then it is very clear that the differentiation of the cells have occurred because of which the cells have taken different roles and different functions. So, the option a and b can be ruled out with the help of above made discussion.

Now the third option is regarding the hemoglobin. We all know that the hemoglobin is very helpful in the process of oxygenation and the deoxygenation of blood. It helps the blood in binding with the oxygen because of the iron molecule. Now we know that the algae do not have any blood and they do not require an oxygenation process so they also have no use of the hemoglobin. Therefore, the option c can also be ruled out which leaves us with the option d.

The red algae and the brown algae are known to be sessile and only the green algae are motile. But the catch is that the brown algae is reported to be having sperms which are motile and the green algae also produce sperms having flagella but the red algae do not produce any motile sperms in its life cycle.

Hence, the correct answer is option (D).

Note: The red algae and the brown algae are the residents of the marine water ecosystem and the green algae is supposedly found in the freshwater ecosystems. The reserved food form of these algae is also different. The green algae store food in form of starch, brown algae in form of laminaria and the red algae stores in the form of floridean starch.