14. Photosynthetic organisms are found mainly in shallow water due to the availa

Question

14. Photosynthetic organisms are found mainly in shallow water due to the availability of a. oxygen. b. nutrients. C. sunlight. d. salt 15. In the a. benthic b. eutrophic zone, aquatic life is diverse and abundant. c. littoral d. plankton 16. In the . a. benthic b. Eutrophic zone, the water is cool and dark. c. littoral d. plankton 17. Which of the following is not a threat to coral reefs? a. oil spills b. sewage c. pesticides d. Phytoplankton 13. Which of the following species has the highest reproductive potential? a. rabbit b. elephant c. human d. horse 14. Which of the following is not an example of exponential growth? a. rabbit populations after being introduced to Australia b. reindeer of the Probilof Islands after eating most of the Lichens c. a bank account that eams interest d. mold appearing on bread overnight

Explanation / Answer

14. Photosynthetic organisms are found mainly in shallow water due to the availability of sunlight. Without the energy from the sun, organisms cannot carry out photosynthesis in spite of the availability of oxygen, nutrient, and salt. Hence, the correct option is C).

15. In the littoral zone, the aquatic life is diverse and abundant as the anount of plant life, i.e. the floral species is optimum to support a wide variety of animals, i.e. the faunal species. The layers above and below the littoral zone, i.e. the eutrophic and benthic zone may not have an optimum amount of flora to support faunal diversity. Hence, the correct option is C).

16. In the benthic zone, the water is cool and dark because sunlight does not penetrate up to that depth. The upper levels, i.e. the littoral and eutrophic zone are able to receive enough sunlight which makes the water in those levels warmer and brighter. Hence, the correct option is A).

17. Oil spills, sewage, and fertilizers reduce the reproductive capacity and the overall growth of the corals. All such factors are therefore threats to coral reefs. Phytoplanktons can't be considered a threat as they support the bioversity in the marine ecosystem. Hence, the correct option is D).

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