Question

A group of students performing an experiment collect Euglena samples from a pond and keep them in darkness in a vessel containing pond water. Which would be the conclusion for this experiment?

Answer 1

@HisOnlyForever Well, Euglena have a green color to them, what does that suggest?

Answer 2

A) the EUGLENA cells remain alive because theyre completely heterotrophic in nature and feed on the organic food matter present in the pond H2O .
B) the EUGLENA cells die because theyre completely autrotrophic in nature and are unable to create food in the absence of sunlight .
C) the EUGENA cells , which are both hetrotrophic and autrotrophic , remain alive even in the absence of sunlight because they feed upon the organic material present in the pond H2O .

Answer 3

@mrdoldum , i think either A or C ?

Answer 4

@HisOnlyForever Most are photosynthetic but some are not.

Answer 5

So then B ?

Answer 6

@mrdoldum

Answer 7

@BioEpic

Answer 8

@HisOnlyForever No, all photosynthetic organisms are autotrophs. But we have some Eulglena that are not autotrophs.

Answer 9

Euglena is a protozoo with the characteristic that is able to perform photosynthesis because it carries a great load of chloroplasts. so, although is not a plant, it behaves like one in this way.
Now, you know that photosynthesis requires sunlight, so its a must, now imagine that you take away the spark that is going to trigger the whole process, we are obviousl left with nothing. no photosynthesis, no nutrients for Euglena to grow.
now that i see that you ask for conclusions, you should have given us the results. such as we detect no more presence of Euglena or the population has decreased exponentially or nothing has happened.
do you see what i mean?

Answer 10

@Biopic Not all Euglena are able to perform photosynthesis.

Answer 11

So B ?

Answer 12

I know, @mrdoldum , but from the circumstances I would say B.

Answer 13

A lot of people have asked this question before, just try googling it and see what you get.

Answer 14

@BioEpic Unfortunately it is all too often the case that you have to structure your answer around what the question wants, not what is the biological truth.

Answer 15

@Abhisar

Answer 16

Go with B

Answer 17

I was right !

Answer 18

However @mrdoldum is correct !

Answer 19

So STill go with B ?

Answer 20

Yep, because mostly they are photosynthetic.

Answer 21

@Abhisar @HisOnlyForever I really wish better questions would be written. Then I, and others, would not have to read into the question what you were told in class, and the questoinee would not have to over think the question either.

Answer 22

i agree !

Answer 23

@Abhisar It is completely unfair to students. I have actually graded lab practicals where I crossed out and marked answers wrong, but never took the points off because the question was so poorly written. I have the least control over lab practical questions.

Answer 24

Yeah..but in most of the elementary level classes they just teach the basics !

Answer 25

b was wrong