SCIENCE
ZOOLOGY
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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pH 7.5
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Constant temperature of 30*c
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Magnesium -free pond water
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Total darkness
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Detailed explanation-1: -In the dark WT Euglena cannot photosynthesize and the chloroplasts inside cells may be a burden for cells. Without chloroplasts in the dark, the mutant cells were expected to grow better than WT since they have no material and energy waste for chloroplasts.
Detailed explanation-2: -Stigma act as a photoreceptor that helps in phototaxis and aids the Euglena to undergo photosynthesis. The stigma is also known as eyespot, which is present in the anterior portion near the reservoir or at the base of the flagellum. They help in photoreception (detects light) and cause phototaxis.
Detailed explanation-3: -Complete answer: Euglena doesn’t have a cellulosic cell wall.
Detailed explanation-4: -So, the correct option is ‘Euglena is a flagellate organism. ‘.