Question

The reticulate chloroplast occur in
A. Ulothrix
B. Oedogonium
C. Spirogyra
D. Chlamydomonas

Answer 1

Hint: Ulothrix has band shaped chloroplast, Oedogonium has meshwork like chloroplast, Spirogyra has spiral shaped and Chlamydomonas has cup shaped chloroplast.

Complete answer:
Green algae are appealing organisms whose different varieties are found in the thallus organizations like single celled colonies and they present a variety of shapes of chloroplast in their cells. The chloroplast is one of the characteristic features of green algae or Chlorophyceae. A chloroplast is a double membrane bound structure which is helpful in the process of photosynthesis and storage of starch. They also contain the green pigment called chlorophyll which is present in the thylakoid membranes that occur in two or six bands per chloroplast. Thylakoids are not free. The glucose is stored in the form of starch just like in the higher plants. The starch is present in the chloroplasts of green algae in special structures called pyrenoids. The pyrenoids are composed of layers of starch.
Reticulated chloroplast is one of the complex plastids which is cylindrical like found in the peripheral region of the cells of few green algae. Besides Reticulate shaped chloroplast there are different shapes found in the different species of green algae. -Cup shaped as in Chlamydomonas, Volvox -Discoid shaped as in Vaucheria, Chara -Girdle shaped in Ulothrix -Reticulate shaped or mesh like in Oedogonium, which encircles the protoplast -Spiral shaped in Spirogyra -Stellate or star shaped in Zygnema

Hence, the correct answer is option (B).

Note: In red algae, the thylakoids of chloroplasts are not bound. They are situated in the stroma of the chloroplast. In higher plants, the chloroplast is only in the discoid shape. The variety of shapes as seen in green algae is seen in higher plants like gymnosperms and angiosperms.