Question

Select the incorrect match with respect to the shape of chloroplast
a) Ulothrix – Pyriform
b) Chlamydomonas – Cup shaped
c)Zygonema – Star-shaped
d)Selaginella – Discoid

Answer 1

Algae are photosynthetic eukaryotic organisms. They have the presence of chlorophyll pigments for photosynthesis. The various pigments present are chlorophyll a, b, c, and d. They are found in algae, green algae, brown algae, and red algae respectively.

Complete answer:
-Ulothrix belongs to green algae. It is found in marine water and freshwater. It has a distinct nucleus, cytoplasm, and chloroplast present. It is filamentous in nature. It has girdle-shaped or the band-shaped chloroplast which is present in the peripheral region of the cytoplasm or is present near the cell wall.

Additional Information: -Selaginella is a creeping plant. It has simple, scale-like leaves present and has the branching stem on which the roots arise. They have chloroplast present in the cells of the spongy layer and are present on the lower epidermis of the leaf. The chloroplast of the selaginella is discoid in shape and the plastids are present in the crescent shape.
-Ulothrix belongs to green algae. It is found in marine water and freshwater. It has a distinct nucleus, cytoplasm, and chloroplast present. It is filamentous in nature. It has girdle-shaped or the band-shaped chloroplast which is present in the peripheral region of the cytoplasm or is present near the cell wall.
-Chlamydomonas is a genus of green algae. It has a unicellular structure. It is found in soils, ponds, and ditches. C.nivalis is a species that impart red color due to the presence of hemato chrome. The cells of the Chlamydomonas are oval in shape and have a non-cellulosic membrane(theca), a stigma(eyespot), and a cup-shaped chloroplast.
-Zygonema is a filamentous thalloid algae that is present in the freshwater bodies. It has short, unbranched filaments which are composed of cylindrical shaped cells. Each cell of zygonema consists of a star-shaped or stellate chloroplast structure in between of which a large central pyrenoid is present. The basal cells usually develop rhizoidal growths.
So, the answer is ‘Ulothrix – Pyriform’.

Note: Green algae use chlorophyll to capture light energy and change it to food for cells by process of photosynthesis. Algae carry out photosynthesis in the cytoplasm of the cell. They produce their own food and generate carbohydrates and oxygen.