Tag: zoology

Questions Related to zoology

Catalytic converter used for controlling pollution is used in

zoology not for breathing not for drinking air pollution and its control air pollution - effects and control environmental issues

  1. Thermal plants

  2. Chimneys

  3. Brick kilns

  4. Motor vehicles

Show answer
Correct Option: D
Explanation:
The catalytic converter is used to convert toxic and harmful pollutant into less toxic emission before they are released in the atmosphere from the engine of motor vehicles. The catalytic converter works as two types- reduction catalyst and the oxidation catalyst. The catalyst is a substance that causes or accelerates a chemical reaction without being unaffected. The catalytic converter reduces carbon monoxide hydrocarbon and nitrous oxides. The reduction catalyst separates nitrogen atom out of nitrous oxides and freezes oxygen, the nitrogen atom combines with another nitrogen atoms forming Nitrogen. The oxidation catalyst reduces the carbon monoxide by oxidizing by reacting carbon monoxide with oxygen in exhaust gas forming carbon dioxide.
Hence, the correct answer is 'Motor vehicles'.

Gaseous pollutants are controlled through

zoology not for breathing not for drinking air pollution and its control air pollution - effects and control environmental issues

  1. Adsorption

  2. ESP

  3. Arrestors

  4. Pyrolysis

  5. Incineration

Show answer
Correct Option: A
Explanation:

Gaseous pollutants include dust, aerosols, suspended particulate matter etc. that are removed by the principle of adsorption. Electrostatic precipitators, cyclones, scrubbers etc. are some devices that can control the gaseous pollutants. These are either made to be retained by the electrostatic field or by pressure. Pyrolisis and incineration are performed for solid pollutants. Arrestors are used to protect the types of equipment from the damaging effect of lightning.

Hence, the correct answer is 'Adsorption'.

Which one of the following is correct?

zoology not for breathing not for drinking air pollution and its control air pollution - effects and control environmental issues

  1. Catalytic converter can precipitate particular matter of less than $2.5$ $\mu$m.

  2. Histones are acidic and form core of DNA packing.

  3. Template with $5'\rightarrow 3'$ polarity shows continuous DNA replication.

  4. Lactobacillus is not present in dough used for idli preparation.

Show answer
Correct Option: D
Explanation:
Fermentation is required for the preparation of dough and for that, Yeast is used. Lactobacillus is used in the preparation of curd.
A. Catalytic converters primarily work by converting the toxic gases released from the vehicular exhausts into the non-toxic substances before they are released into the atmosphere. 
B. Histones are the basic or positively charged proteins made up of amino acids lysine and arginine. They perform packaging of DNA in eukaryotic cells.
C. DNA template with 5′→3′ polarity shows discontinuous replication via the formation of the Okazaki fragments. The 3′→5′ shows continuous replication.
D. Lactobacillus is the main agent that creates curd from milk. For making the dough, Yeast is used that makes the release of carbon dioxide by fermentation.
Hence, the correct answer is 'Lactobacillus is not present in dough used for idli preparation.'

Electrostatic precipitators (ESP) are used to control

zoology not for breathing not for drinking air pollution and its control air pollution - effects and control environmental issues

  1. pesticide pollution

  2. air pollution

  3. radioactive pollution

  4. water pollution

Show answer
Correct Option: B
Explanation:

Electrostatic precipitators (ESP)  is a device that removes suspended dust particles from a gas or exhaust by applying a high-voltage electrostatic charge and collecting the particles on charged plates. Electrostatic precipitator, also called electrostatic air cleaner, a device that uses an electric charge to remove certain impurities—either solid particles or liquid droplets—from the air or other gases.

So, the correct option is 'Air pollution'.

Pyrogallol is used in gas analysis because its

zoology not for breathing not for drinking air pollution and its control air pollution - effects and control environmental issues

  1. Alkaline solution absorbs oxygen

  2. Acidic solution absorbs oxygen

  3. Alkaline solution reacts with carbon dioxide

  4. Acidic solution absorbs nitrogen

Show answer
Correct Option: A
Explanation:

A pyrogallol is also called as 1,2,3-trihydroxybenzene. It is a benzenetriol. It is a reducing agent. It is used as a developer in photography. It is also used as a coupling agent in printing. It undergoes rapid autooxidation in alkaline solution. Hence, its alkaline solution is used in the gas analysis because it absorbs oxygen. 

Thus, the correct answer is 'Alkaline solution absorbs oxygen'.

Total number of individuals of a species per unit area and per unit time is called 

zoology human population population ecology population size population and how it changes

  1. Population size

  2. Population density

  3. Demography

  4. Population dynamics

Show answer
Correct Option: B
Explanation:

Population density is the number of individuals present per unit area or volume at a given time. If the total number of individuals is represented by letter N and the number of units of space (area for land organisms and volume for water organisms) by letter S, then the population density D can be represented as D =N/S. For instance, number of animals per square kilometer, number of trees per acre in a forest, etc. So, the correct answer is 'Population density'.

For which of the following cases, population density can be easily determined by utulising non-biological parameter?

zoology human population population ecology population size population and how it changes

  1. Fish density

  2. Density of Bactria in culture plate

  3. Siberian cranes at Bharatpur wetlands

  4. Tiger census

Show answer
Correct Option: D
Explanation:
Sometimes, for certain ecological investigations, there is no need to the absolute population densities. Relative densities serve the  purpose equally well. In this case, population size is indirectly estimated without actually counting them. For example, the number of fishes caught per trap is good enough measure of its total population density in the lake. The tiger census in our National park and tiger reserves is often based on pug marks (animal's ft print ) and fecal pellets. So, the correct answer is 'Tiger census'.

Which of the following is not an example of using relative density to measure population density in a certain area?

zoology human population population ecology population size population and how it changes

  1. Counting pug marks of tigers to find population density of tigers a forest

  2. Counting the number of fishes caught in a trap to find population density of fishes in a lake

  3. Measuring biomass of bacterial culture to find out population density of bacteria in a petri dish

  4. Measuring biomass of phytoplanktons in 1 cc water to find out population density of phytoplanktons in a lake

Show answer
Correct Option: D
Explanation:

Option D is correct,  because measuring of biomass of phytoplanktons is very time consuming and It is a microscopic task to measure only PHYTOPLANKTON in 1 cc water except other species found in the given water. 

In some cases, polpulation density is measured in terms of biomass rather than in terms of numbers becouse ________________________.

zoology human population population ecology population size population and how it changes

  1. it is a more meaningful measure when the considered organisms vary greatly in size.

  2. it is more convenient when population is huge and counting is impossible or very time consuming

  3. it is a relatively constant measure

  4. both a and b

Show answer
Correct Option: D
Explanation:

Although the total number is most approprite measure of population density, but in some cases it is difficult to determine.In a forest area, spouse there are 200 Pathenium plants but only a single huge banyan tree with a large canopy. Stating that the population density of banyan is low relative to that of Pathenium, amount to underestimating the great role of bayan in that forest community.

In N = population density at time t, then population density at time +1 can be written as 
$N _t+1 = N _1 + [(A +B) - (C + D)]$
Select the correct option for A, B, C and D in the above equation. 

zoology human population population ecology population size population and how it changes

  1. A can be mortality and B can be natality

  2. B can be immigration and C can be natality

  3. C can be mortality and D can be immigration

  4. A can be natality and D can be emigration

Show answer
Correct Option: D
Explanation:

A and B are nasality and immigration. They add to population density. C and D are mortality and emigration. They decrease population density