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A beaker of pond water containing few…

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A beaker of pond water containing few specimens of Euglena was placed in a dark room for two weeks. At the end of this period, the specimens of Euglena were still alive because they were…

A. able to carry out holozoic nutrition

B. able to carry out photosynthesis using carbon dioxide in the pond water

C. better adapted to life in darkness than to life in light

D. not overcrowded   

QUICK ANSWER…

A

DETAILS…  

Euglenas are unicellular living organisms that exhibit both plant-like and animal-like mode of feeding; that is, they can behave like plants to photosynthesize in presence of sunlight, and also behave like an animal in the absence of sunlight.

Also, you can say they are MIXOTROPHIC… that is, they are both autotrophic (produce their own food through photosynthesis), and heterotrophic (holozoic).

Now for the right answer to the above question:

  1. Euglenas, in the absence of sunlight, can survive by ingesting nitrogenous dead substances obtained from the surroundings…  A is the right answer.
  2. Photosynthesis cannot occur in absence of sunlight… the mere suggestion of carrying out photosynthesis with just carbon dioxide in the pond is laughable. B is wrong
  3. No, suggested better adaptation in darkness is wrong. C is wrong
  4. Overcrowding does not play a role here, even if they were not overcrowded, they will still die if they only depend on sunlight to survive.

QUICK TIPS…

You may commit to memory today that euglenas are both plant-like and animal-like in mode of feeding. They are mixotrophic…

use the questions and answers session to correct, ask or contribute your views…

/ culled from 2018 JAMB/UTME biology question 2 /

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