OFFICIAL EXPLANATION

The presence of predators of zooplankton, feeding near the surface during the day, would suggest that D. galeata is consumed at a higher rate than D. hyaline. Therefore, if this choice were true, it would help resolve the apparent paradox that D. galeata grows and reproduces faster than D. hyaline, yet D. hyalian has the greater population.

A is incorrect. Nothing is said in the paragraph to show the relevance of the presence of other species of zooplankton to the relative population size of the two species. C is not correct. This information explains the slower growth and reproduction of D. hyaline, which is one aspect of the paradox; but it does nothing to show how D. hyaline can grow and reproduce more slowly and yet have the greater population. D is incorrect. Nothing is said in the paragraph to show the relevance to the paradox of D. galeata’s clustering under vegetation. E is also incorrect. More information on the faster reproduction of D. galeata does not show how, despite faster growth and reproduction, D. galeata has the lesser population.
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Is it C...If D. Hyaline matures more slowly than D. Galeta, population of D. Hyaline will outnumber the population of D Galeta.

C is good choice among given choices.

Clear B man.good question this.

B and C are the main contenders

B - Says why D.g population is less

C - Restates what is already given in the passage(D.g reproduces faster).Hence incorrect.

IMO the answer is B. Because only B gives a reason to why the population of D.G would decrease and D.H would remain unaffected.

Even though D. galeata grows and reproduces much faster, its population is often outnumbered by D. hyaline.

Option B says Predators of Zooplankton D. zylen live and feed near surface during the day. Predators are feeding on D.Z. not on D.G.
Then how would population of D.G. reduce?

Please clear my confusion.

The predators are of zooplankton and not of any specific kind. During day G is near the surface so predators eat more G.
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Two possible explanations:

1. No. of eggs laid / offsprings produced by DH >DG:
Ans choice E is opposite to this info.

2. Life-span of DH >DG: Ans choice B.

Hence, IMO, Ans is choice B

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B . ONLY If D. Hyaline and D. galatia are both sub species of zooplankton .