30. What is a habitat? An organism\'s physical location in its community An orga

Question

30. What is a habitat? An organism's physical location in its community An organism's particular behavior An organism's survival strategy An organism's role in the community a. d. What controls bacterial growth in the ocean? b. Enrichment of toxic by-products Lack of labile organic matter Predation Mortality to virus attack All are correct 32. What is the name for the marine habitat found between the highest high tide and lowest low tide? b. d. Benthic zone In deep sea communities of the aphotic zone, primary production is accomplished by: b. active transport d. chemosynthesis Neritic zone Surf zone Intertidal zone 33. photosynthesis osmosis 34. What is the order of light regimes in the ocean with increasing depth (surface, intermediate, deep water): a. disphotic, aphotic, euphotic b. euphotic, disphotic, aphotic euphotic, aphotic, disphotic aphotic, disphotic, euphotic d. What is a niche? b. d. 35. An organism's habitat. The competition between organisms. An organism's physical location in the environment. An organism's role in the community 36. Sessile organisms in the rocky intertidal zone must be able to avoid dessication and predation move to calm waters and eat avoid waves and zooplankton be heterotrophic and large a. b. d. 37. The two marine prokaryotic domains are: b. c. d. zooplankton and fish bacteria and archaea benthic and planktonic autotrophic and heterotrophic In addition to forming harmful algal blooms, some dinoflagellates can also: b. d. 38. bioluminesce produce toxins eat other microbes all are correct For measurements of primary productivity, the dark bottle is used to a. balance the buoy system b. correct for respiration c. measure zooplankton grazing d. store extra radioactive bicarbonate 39.

Explanation / Answer

30. a) An organism's physical location in it's community.

Reason : A habitat is defined as the natural surroundings or environment in which an organism of a particular species lives.

31. e) All are correct.

Reason : In most of the oceans, specifically in the southern ocean, the labile organic matter appeared to be the primary control over the bacterial growth rates. The other associated factors which also have control over the bacterial growth includes the enrichment of toxic by products, predation and mortality to virus attack.

32. c) Intertidal zone.

Reason : Also known as the littoral zone, the intertidal zone is the marine habitat between the high tide and the low tide regions.

33. d) Chemosynthesis.

Reason : Chemosynthesis is the process by which certain bacteria or other living organisms synthesize organic compounds using the energy derived from the reactions taking place in the absence of sunlight (aphotic zone).

34. b) Euphotic, disphotic, aphotic.

Reason : The intensity of light decreases exponentially with increasing depth. The surface water zone where maximum light penetrates is the euphotic sone followed by the intermediate disphotic zone which ultimately leads to the dark aphotic zone where no light reaches.

35. d) An organism's role in the community.

Reason : An ecological niche is defined as an organisms role in it's community.

36. a) avoid dessication and predation.

Reason : avoiding drying out or dessication and predation is important for the sessile organisms of the rocky intertidal zones because they are immobile and fixed at a single place.

37. b) bacteria and archea.

Reason : Bacteria and archea are the two main prokaryotic domains that lack a well defined nucleus, mitochondria and other cell organelles.

38. d) All are correct.

Reason : All of the given options are correct because the dinoflagellates can bioluminesce, eat other microbes as well as produce toxins apart from forming harmful algal blooms.

39. b) Correct for respiration.

Reason : The light and dark bottle method is used to measure the production of oxygen and over time,the decrease in the amount of dissolved oxygen in the dark bottle is a measure of the rate of respiration.

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