Tag: zoology

Questions Related to zoology

State whether the following statements are true or false.
Actin is present in thin filament.

zoology locomotion and movement contractile protein structure of muscle muscles and their structure

  1. True

  2. False

Show answer
Correct Option: A
Explanation:

Skeletal muscle is composed of muscle fibres which have smaller units called myofibrils. There are three types of proteins make up each myofibril; they are contractile, regulatory and structural proteins. By contractile proteins, we mean actin (thin filament) and myosin (thick filament).

So, the correct option is 'True'.

Major protein constituent of muscle fibre is?

zoology skeleton and movements contractile protein structure of muscle muscles and their structure

  1. Actin

  2. Myosin

  3. Tropomyosin

  4. Reticulin

Show answer
Correct Option: B

Actin binding sites are located over

zoology skeleton and movements contractile protein structure of muscle muscles and their structure

  1. Troponin

  2. Tropomyosin

  3. Meromyosin

  4. Creatnine

  5. Both A and B

Show answer
Correct Option: C
Explanation:
  • The myofibril is composed of two types of filaments. They are thick filament(Myosin) and Thin filament(Actin).
  • Increase in Ca++ level leads to the binding of calcium with a subunit of troponin i.e troponin-C on actin filaments and thereby remove the masking of active sites for myosin. Utilizing the energy from ATP hydrolysis, the myosin head now binds to the exposed active sites on actin to form a cross bridge.
  • Each myosin (thick) filament is also a polymerized protein. Many monomeric proteins called Meromyosins constitute one thick filament. Each meromyosin has the globular head is an active ATPase enzyme and has binding sites for ATP and active sites for actin.
  • Hence actin binding sites are located over meromyosin'.
  • So, the correct answer is 'Meromyosin'.

Identify the thick myofilament from the given contractile proteins.

zoology skeleton and movements contractile protein structure of muscle muscles and their structure

  1. Troponin 

  2. Myosin

  3. Tropomyosin

  4. Actin

Show answer
Correct Option: B
Explanation:
  • Skeletal muscle fiber is made up of two types of filaments. They are thick filament and thin filament.
  • Thick filament is made up of a protein called Myosin. Actin filaments are thinner as compared to the myosin filaments, hence are commonly called thin and thick filaments respectively
  • Each myosin (thick filament) is made up of Many monomeric proteins called Meromyosins.
  • Hence the thick myofilament from the given contractile proteins is myosin.
  • So.the correct answer is 'Myosin'.

In skeleton muscle Z-line is connected to.

zoology skeleton and movements contractile protein structure of muscle muscles and their structure

  1. Actin

  2. Myosin

  3. Tropomyosin

  4. Hensen's line

Show answer
Correct Option: A
Explanation:

  • Each myofibril consists of a series of contractile units (sarcomeres) connected at a protein border (the Z line).
  •  Thin filaments(actin) of adjacent sarcomeres are present in the Z line between the thin filaments are thick filaments(myosin). 
  • The protein tropomyosin winds around the thin filaments and covers the myosin binding sites. Hence, In skeleton muscle, Z-line is connected to actin.
So, the correct answer is 'actin'.

Major protein in thick filaments of skeletal muscle fibre is?

zoology skeleton and movements contractile protein structure of muscle muscles and their structure

  1. Myosin

  2. Actin

  3. Tropomyosin

  4. Troponin

Show answer
Correct Option: A
Explanation:

  • The main contractile components of a muscle fibre include:
  •  Thick filaments - The major protein of a thick filament is myosin. 
  • Thin filaments - The major proteins of a thin filament include actin, as well as troponin and tropomyosin. Hence, Major protein in thick filaments of skeletal muscle fibre is myosin.
So, the correct answer is 'myosin'.

Match column I with column II and select the correct option from the given codes.

Column I Column II
A. Electrostatic precipitator (i) Removes gases like $SO _2$
B. Scrubber (ii) Reduces automobile emission
C. Catalytic converter (iii) Removes particulate matter
zoology not for breathing not for drinking air pollution and its control air pollution - effects and control environmental issues

  1. A - (ii), B - (iii), C - (i)

  2. A - (iii), B - (ii), C - (i)

  3. A - (i), B - (ii), C - (iii)

  4. A - (iii), B - (i), C - (ii)

Show answer
Correct Option: D
Explanation:
 Column I  Column II
 Electrostatic precipitator  Removes particulate matter
 Scrubber   Removes gases like SO$ _2$
 Catalytic converter  Reduces automobile emmission.

Read the following statements carefully.
(i) An electrostatic precipitator removes particulate matter by imposing negative charge on them.
(ii) Catalytic converters convert unburnt hydrocarbons into $ { CO } _{ 2 } $ and water.
(iii) Peroxyacyl nitrates (PAN) is a secondary pollutant.
(iv) DDT is a non-biodegradable pollutant.

Which of the above statements are incorrect ?

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

  1. (i) and (ii)

  2. (iii) and (iv)

  3. (i) and (iii)

  4. None of these

Show answer
Correct Option: D
Explanation:
An electrostatic precipitator removes particulate matter by imposing a negative charge on them. Then they are separated electrostatically.
Catalytic converters convert unburnt hydrocarbons into CO2CO2 and water. They are used in automobiles.
Peroxyacyl nitrates (PANs) is a secondary pollutant formed by reaction of oxides of nitrogen and unsaturated hydrocarbons.
DDT is a non-biodegradable pollutant.
All the given statements in the question are correct,
So, the correct option is 'None of these'.

Match column I with column II and select the correct option from the given codes.

Column I Column II
A Catalytic converter (i) Used in industries and power plants
B Electrostatic precipitator (ii) Used in automobiles
C Earmuffs (iii) High noise level
D Land fills (iv) Solid wastes
zoology not for breathing not for drinking air pollution and its control air pollution - effects and control environmental issues

  1. A-(i), B-(ii), C-(iii), D-(iv)

  2. A-(II), B-(i), C-(iii), D-(iv)

  3. A-(iv), B-(III), C-(ii), D-(i)

  4. A-(iii), B-(ii), C-(iv), D-(i)

Show answer
Correct Option: B
Explanation:
Catalytic converters are used in automobiles to reduce the harmful gases from the emission.
Electrostatic precipitators are used in industries and power plants to remove the harmful gases from their emission.
Earmuffs are used in cases of high noise level to protect the eardrum and the ear from the noise pollution.
Landfills are the places where the solid waste is dumped.
So, the correct option is 'A-(II), B-(i), C-(iii), D-(iv)'


A pollution control device which can remove gases like $SO _2$ are known as

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

  1. Electrostatic precipitator

  2. Scrubber

  3. Chimneys

  4. Both A and B

Show answer
Correct Option: B
Explanation:
  • A pollution control device which can remove gases like SO$ _2$ is known as a scrubber. It removes most of the sulfur oxides from the smokestack exhaust of a power plant when sulfur dioxide enters a scrubber.
  •  In the scrubber, there is a water spray that produces a cloud of fine water droplets. The water is mixed with crushed limestone, which reacts with the sulfur and pulls it out of the exhaust.

So, the correct answer is 'Scrubber'.