9) Why don\'t some grazers feed at the top of macroalgae? b) cute predators may

Question

9) Why don't some grazers feed at the top of macroalgae? b) cute predators may eat them d) there are no grazers of macroalga a) waves knock them down c) they are negatively phototaxic 10) In the absence of predation on rocky shores: the number of species declines and dominance by a few species increases b) the number of species declines and dominance by a few species decreases c) the number of species declines and dominance by a few species remains the same d) none of the above 11) A higher number of species tends to be found in: a) areas of high spatial heterogeneity b) areas of low spatial heterogeneity d) areas of changing salinity c) areas that are cold

Explanation / Answer

9. Option c is correct answer. A negative phototaxis indicates movement away from the target.

10. Option a is the correct answer. Due to lack of predation, the population of some particular species will become higher and thus they will be dominant leading to decline in number of species.

11. Option a is the correct answer. A more heterogenous environment support more number of species through partioned niche space.

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