A) Spirogyra
B) Volvox
C) Chlamydomonas
D) Chlorella
Correct Answer: D
Solution :
Calvin cycle (\[{{\text{C}}_{\text{3}}}\]cycle) was discovered by Calvin, Benson and their associates when fed Chlorella and Scenedesmus with radioactive carbon \[\text{(}{{\text{C}}^{14}}\text{)}\] in\[\text{C}{{\text{O}}_{\text{2}}}\text{.}\] They found that after three seconds radioactivity appeared in phosphoglyceric acid or PGA (the first stable product of Calvin cycle). Spirogyra is a free floating freshwater alga. The body is filamentous, uniseriate and unbranched. It shows, sexual reproduction by conjugation. Chlamydomonas is a freshwater, free floating alga. It is unicellular and imparting red colour to snow hence, called red snow. Volvox is a green, flagellate colonial alga of world wide distribution. A colony consisting of a definite number of cells arranged in a specific manner and forming an integrated whole is called a coenobium.
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