This set of Marine Biotechnology Multiple Choice Questions & Answers (MCQs) focuses on “Ocean Habitat – Set 2”.
1. _________________ property of seawater is crucial to position maintenance of sea-surface organisms.
a) Surface tension
b) Latent heat of vaporization
c) Latent heat of fusion
d) Heat capacity
View Answer
Explanation: Surface tension refers to the flexible molecular skin over the water surface, it increases when temperature decreases. This property of seawater is crucial to position maintenance of sea-surface organisms, and it is sufficiently strong to support full weight of a water strider (marine insect).
2. Below 4°C, the density of water decreases with increasing temperature.
a) True
b) False
View Answer
Explanation: At 4°C or above, the density of water decreases as the temperature increase, just like other liquids. Below 4°C, however this temperature – density relationship reverses. This property of seawater prevents the ice from sinking down (solid ice is 8% less dense than water at the same temperature).
3. Salinity if seawater is measured in _____________
a) parts per hundred
b) parts per thousand
c) parts per million
d) parts per billion
View Answer
Explanation: Salinity of seawater is measured in parts per thousand (0/00). Salinity refers to the total amount of dissolved salts in seawater. Values range from zero at river mouths to 400/00 in arid areas and in open oceans it averages to 350/00.
4. Clear seawater is most transparent to _____________________ light.
a) red, yellow
b) violet, blue
c) violet, green
d) blue, green
View Answer
Explanation: Clear seawater allows maximum penetration of blue and green potion (450-550 nm) of the spectrum. 10% of it, especially blue light, penetrates to depths of 100 m or more. Deeper penetration and back-scattering of blue light account for the characteristic blue color of tropical waters.
5. Poikiliotherms lack the mechanisms for body temperature regulation.
a) True
b) False
View Answer
Explanation: Poikilotherms also called cold-blooded organisms lack the mechanisms for body temperature regulation. The body temperature of such organisms is influenced largely and regulated by external environment.
6. Which of the following marine organism doesn’t exhibit thermoregulatory behavior?
a) Barnacles
b) Large tuna
c) Billfish
d) Shark
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Explanation: Large tunas, billfish and sharks exhibit thermoregulatory behavior by retaining the heat produced by their swimming muscles. These organisms however lack constant body temperatures, being a mix of poikilotherms and endotherms.
7. In an Ocean, which of the following is a subsurface zone of rapid temperature decrease?
a) Pycnocline
b) Thermocline
c) Thermohaline
d) Twilight zone
View Answer
Explanation: Thermocline is the subsurface region of rapid temperature decrease with depth (1°C/m) in the Ocean. This zone creates a zone of comparable density increase called pycnocline. This zonation creates a two-layered system in the Ocean.
8. In Temperate and Polar Regions, ______________ is a seasonal feature.
a) thermocline
b) photic zone
c) littoral zone
d) sublittoral zone
View Answer
Explanation: In Temperate and Polar regions, thermocline – zone of rapid temperature decrease with depth, is a seasonal feature. During winter, the temperature of the surface waters is same as that of deeper water causing the thermocline to disappear.
Sanfoundry Global Education & Learning Series – Marine Biotechnology.
To practice all areas of Marine Biotechnology, here is complete set of 1000+ Multiple Choice Questions and Answers.
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