Question

কোন শ্রেনীর শৈবাল এর ক্লোরোপ্লাস্ট নেই
No class of algae has chloroplasts​

Answer 1

Explanation:

Chloroplasts are the green-colored plastids present in the plants and other protists such as Algae.

The Green color of Chloroplast is due to the presence of chlorophyll pigments a and b which helps in photosynthesis.

They are double membraned cell organelles with intermembrane space and have a disc-shaped structure called 'Thylakoids'. The group of thylakoids stacks to form Grana.

Based on the endosymbiosis theory, the algae such as Red algae and the Cyanobacteria(blue-green algae) have no grana i.e., the thylakoids are unstacked and single.

Therefore, the algal chloroplasts usually lack Grana.

So, the correct answer is 'Grana'

Answer 2

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⟹ কোন শ্রেনীর শৈবাল এর ক্লোরোপ্লাস্ট নেই

In English :-

⟹ No class of shaibals have chloroblast

This is a Bangla language.