QUIZ 2022 EXPLANATION
QUIZ 2022 EXPLANATION
- The white water phenomenon is due to the abundance of
a)
Dinoflagelates
b) Cocolithophores
c)
Protozoan
d)
Diatoms
Explanation
There are different phenomena that can be described as "white water phenomenon," but in some cases, it may be due to the abundance of tiny particles or organisms in the water that scatter light and make the water appear white.
One example of this is the white water phenomenon that can occur in rivers during periods of high flow, particularly after heavy rainfall. The increased flow can stir up sediment from the riverbed, which can turn the water a milky white color.
In marine environments, the white water phenomenon can also be caused by the abundance of tiny planktonic organisms, such as diatoms or coccolithophores, that produce calcium carbonate plates or silica shells that scatter light and make the water appear milky or opaque.
Another example of the white water phenomenon is the frothy white water that can be seen in breaking waves. This is caused by the turbulence of the water as it interacts with the seafloor or other obstructions, which can trap air bubbles and create foam that appears white.
Overall, the white water phenomenon can be caused by a variety of factors, including the abundance of particles or organisms in the water, the presence of foam or bubbles, or the scattering of light by other physical or chemical properties of the water.
- Diatoms are rich in vitamins
a)
Vit A&D
b)
Vit C&K
c)
Vit B6&B12
d) Vit
B1& E
Explanation
While diatoms are a source of many important nutrients for marine organisms, they are not particularly rich in vitamins. Diatoms do contain small amounts of some vitamins, such as vitamin B12 and vitamin E, as well as some essential fatty acids, but they are not considered to be a significant dietary source of vitamins for humans or other animals.
However, diatoms are an important part of the marine food chain, and they provide a source of nutrition for many types of marine organisms, including zooplankton, small fish, and some whales. As such, they play an important role in the overall health and productivity of marine ecosystems.
- Plankton of salt water is known as
a)
Limnoplankton
b)
Holoplankton
c)
Haliplankton
d)
Meroplankton
- The total living and non living matter of aquatic body is
a)
Plankton
b)
Neuston
c)
Sestan
d)
Nekton
- The height of wave in water body is calculated by
a)
h= ⅓√F
b)
h=1/4√F
c)
h=
1√F
d)
h=2√F
Explanation
The equation h = (1/3)√F is known as the "linear wave theory," and it is a commonly used formula for estimating the height of waves in deep water.
In the equation, "h" represents the significant wave height, which is the average height of the highest one-third of waves in a given wave train. "F" represents the wave frequency, which is the number of waves that pass a fixed point in a given period of time.
The equation assumes that the waves are regular and symmetrical, and that they are propagating through deep water, which is defined as water that is deeper than half the wavelength of the waves. In practice, wave height can be affected by many other factors, such as wind speed, water depth, and the shape of the seafloor, so the linear wave theory is often used as a starting point for wave height estimates, which are then refined based on additional data and observations.
- Horizontal currents are common in
a)
Lake
b)
Pond
c)
River
d)
Sea
-----------Horizontal currents can occur in lakes, just as they can in oceans and other bodies of water. Horizontal currents are generally driven by factors such as wind, water temperature differences, and the shape of the lake basin.
Wind is one of the primary drivers of horizontal currents in lakes, particularly in shallow areas where the wind can easily generate waves and currents. The direction and strength of the wind can cause the surface water to move in a particular direction, which can in turn cause deeper water to move in the same direction through a process known as "Ekman transport."
Water temperature differences can also cause horizontal currents in lakes, particularly in deeper areas where there may be temperature gradients between different layers of water. These currents can be caused by differences in density, which can cause denser, colder water to sink and move horizontally along the bottom of the lake, while warmer, less dense water rises and moves horizontally along the surface.
The shape of the lake basin can also affect horizontal currents, particularly in narrow or irregularly shaped lakes where water can be forced to flow in certain directions due to the shape of the shoreline or the presence of underwater ridges or channels.
It is worth noting that horizontal currents can vary widely depending on factors such as the size and shape of the lake, the local climate and weather patterns, and the geology of the surrounding landscape.
- Copper sulphatepentahydrate is commercially known as
a)
Simacone
b) Blue
stone
c)
Acrolin
d)
Gypsum
- Sulphur bottom is caused by
a)
Cocareiscerticola
b)
Spirulina
c)
Rhizosolennia
d)
Chaetoceras
Explanation
Copper sulfate pentahydrate, which is a compound of copper, sulfur, and water, is commercially known by a variety of names depending on its intended use. Some of the common names for copper sulfate pentahydrate include:
- Blue vitriol
- Bluestone
- Cupric sulfate pentahydrate
- Copper (II) sulfate pentahydrate
- Copper vitriol
- Salzburg vitriol
Copper sulfate pentahydrate is commonly used in a variety of applications, including as a fungicide and herbicide in agriculture, as a wood preservative, as a feed additive for livestock, as a component in swimming pool and spa treatments, and as a laboratory reagent.
- In natural water, ammonia salts commonly occur in the form of
a)
Ammonium sulphate
b) Ammonium carbonate
c)
Ammonium bicarbonate
d)
NH4+
Explanation
In natural water, ammonia salts commonly occur in the form of ammonium ions (NH4+). Ammonium ions are formed when ammonia (NH3) reacts with water (H2O) to form the ammonium ion and a hydroxide ion (OH-). The reaction is reversible, so the concentration of ammonium ions in natural water can be affected by factors such as pH, temperature, and the presence of other chemicals.
Ammonium ions are a common form of nitrogen in natural water, and they can be produced by a variety of natural processes, including the breakdown of organic matter, the decay of plant and animal tissue, and the excretion of waste products by aquatic organisms. Ammonium ions can also be produced by human activities such as agriculture, wastewater treatment, and industrial processes, and they can be harmful to aquatic life in high concentrations.
- An organophosphate pesticides
a)
Aldine
b)
DDT
c)
Malathion
d) Bleaching powder
Explanation
Malathion is an organophosphate insecticide that is commonly used in agriculture and public health programs to control a wide variety of insect pests, including mosquitoes, fruit flies, and other agricultural pests. It works by inhibiting the activity of an enzyme called acetylcholinesterase, which is necessary for the proper functioning of the nervous system in insects and other animals.
Malathion is typically applied as a spray or dust, and it can be used on a variety of crops, including fruits, vegetables, and ornamental plants. It is also used in public health programs to control mosquito populations and prevent the spread of diseases such as malaria, dengue fever, and West Nile virus.
While malathion is considered relatively safe for humans and animals when used according to label instructions, it can be toxic in high concentrations, and it can pose a risk to aquatic life if it enters waterways. For this reason, its use is tightly regulated by government agencies, and it should only be used by trained professionals who are familiar with its potential hazards and proper application techniques.
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