This set of Marine Biotechnology Multiple Choice Questions & Answers (MCQs) focuses on “Marine Plants – Set 2”.
1. Which of the following is not a biotic factor affecting primary production in the sea?
a) Water temperature
b) Photosynthetic rates
c) Phytoplankton production
d) Herbivore production
View Answer
Explanation: Seasonal variations in the light intensity affect the primary production in the sea either directly or indirectly. The biotic factors include those that are associated with the living organisms in the sea such as their production and survival rates.
2. In temperate seas, diatom bloom can be seen during ______________________
a) spring
b) summer
c) winter
d) autumn
View Answer
Explanation: In temperate seas due to wintertime convective mixing of the surface and deeper ocean layers, there is a spring diatom bloom. The bloom is a result of variations in water temperature, and availability of light and nutrients.
3. In temperate seas, the dinoflagellate population __________________ during the autumn.
a) increases
b) decreases
c) remains constant
d) matches the diatom population
View Answer
Explanation: Dinoflagellates are motile phytoplankton species that require high light intensities to flourish. During autumn the light intensity diminishes impacting the dinoflagellate population.
4. Diatoms perform better in colder waters whereas dinoflagellates perform better in warmer waters.
a) True
b) False
View Answer
Explanation: Diatoms require colder, deeper and less well-lit waters rich in silicate for optimum growth and hence they are found in deeper layers. Dinoflagellates on the other hand require warmer waters characterized by abundance of nutrients.
5. Net phytoplankton production (NPP) is low in warm seas due to __________________
a) strong pycnocline
b) high light intensity
c) high air temperature
d) excess nutrients in the water
View Answer
Explanation: NPP is low in warm seas, around 55 g C/m2 due to a stronger pycnocline that prevents vertical mixing of nutrients from below. Dinoflagellates are more abundant than the diatoms in such conditions.
6. El Nino is characterized by _____________________
a) prominent warming
b) excessive cooling
c) silicate deficiency
d) pH increase
View Answer
Explanation: El Nino impacts the upwelling patterns in the central Pacific Ocean and is characterized by prominent warming of the surface waters.
7. Permanent sea ice perpetually covering the polar seas is known as the __________________
a) host ice
b) cold ice
c) fast ice
d) fire ice
View Answer
Explanation: The polar seas experience long cold nights and days without sunlight, giving the seas a usual temperature of 0°C. The perpetual ice covering the polar seas is known as fast ice. Polar seas are areas of the ocean with a cover of either permanent fast ice or seasonal pack ice.
8. After the complete development of marine plants, which tissue is responsible for regeneration?
a) Holdfast and haptera
b) Blades
c) Spines
d) Meristematic tissue
View Answer
Explanation: For the regeneration and replacement of tissue loss that occurs due to wave erosion and animal grazing. In kelp plants and other seaweeds the meristematic tissue occurs at the upper growing tip as well as below near the holdfast.
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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