Question

Study the given figures and select the correct statements regarding them.

(i) Figure X represents a unicellular alga.
(ii) Figure Y represents Hydra.
(iii) Organisms in figure X cannot synthesize its own food.
(iv) The organism in figure Y shows a mixotrophic mode of nutrition.

• A. (i), (ii), (iii) and (iv)
• B. (i), (iii) and (iv)
• C. (ii) and (iii)
• D. (i) and (iv)

Answer 1

Answer: (D)

Figure X represents Chlamydomonas which is a genus of green algae consisting of unicellular flagellates, found in stagnant water and in damp soil, in freshwater, seawater, and even in snow as "snow algae". Chlamydomonas is used as a model organism for molecular biology, especially studies of flagellar motility and chloroplast dynamics, biogenesis, and genetics. One of the many striking features of Chlamydomonas is that it contains ion channels, (channel rhodopsins), that are directly activated by light. Some regulatory systems of Chlamydomonas are more complex than their homologs in Gymnosperms, with evolutionarily related regulatory proteins being larger and containing additional domains.
Euglena, the genus of more than 1,000 species of single-celled flagellated (i.e., having a whip-like appendage) microorganisms that feature both plant and animal characteristics. Found worldwide, Euglena live in the fresh and brackish water rich in organic matter and can also be found in moist soils. As photosynthetic protists, Euglena has a taxonomy that is somewhat contentious, and the genus is often placed either in the phylum Euglenozoa or the algal phylum Euglenophyta. They are mixotrophs meaning that they show both phototrophic and heterotrophic mode of nutrition.

So, the correct answer is '(i) and (iv)'