West Bengal Previous Year BIOLOGY Questons with Answers Part-4

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In this post we list West Bengal Public Service Commission's previous year asked BIOLOGY related questions with detail  answers. This post is Part-4.
CLICK HERE for Part-1
CLICK HERE for Part-2
CLICK HERE for Part-3 

In-fact this is the part of WBPSC SCIENCE Series .
Under this series we segregate and answer WBPSC asked science questions into PHYSICS , CHEMISTRY , BIOLOGY , COMPUTER .

GENETICS

Q. In mono-hybrid cross of Mendel, when a pure tall plant was crossed with dwarf plant, all the F1 progeny were tall, because of:  
  [WBCS Preliminary Exam-2015]

  1. Co-dominance
  2. Dominance
  3. Incomplete dominance
  4. Epistasis

B. Dominance

Explanation:

If a pure tall plant was crossed with dwarf plant, genotype of F1 progeny will be Tt.
Phenotype of all F1 progeny will be tall.
Here, one trait (tall) conceal the presence of another trait (dwarf) because of Dominance.

Q. Phenotypic ratio of Mendelian Dihybrid cross is 
   [WBCS Preliminary 2015]

  1. 9:3:3:1
  2. 1:1:1:1
  3. 3:4:3:1
  4. 1:2:1:1

A. 9:3:3:1

Explanation:
Phenotypic ratio of Mendelian Dihybrid cross is 9:3:3:1.

Here, we are taking two characteristics (since, dihybrid cross).

For 1st Characteristics:
'R' is dominant and 'r' is recessive.
For 2nd Characteristics
'A' is dominant and 'a' is recessive.

The phenotypic ratio of dihybrid cross is 9:3:3:1
From the above table, we can conclude the following
  • There are 9 combinations that display both dominant characteristics. 
  • There are 3 combinations that display first dominant characteristic and second recessive characteristic.  
  • There are 3 combinations that shows first recessive and second dominant characteristics. 
  • There are only 1 combination that shows both recessive characteristics.
Therefore, phenotypic ratio of Mendelian Dihybrid cross is 9:3:3:1.

Q. A pure Red flower bearing plant is crossed with pure white flower and the F1 plant bears pink flowers. This is an example of  
  [WBCS Preliminary Exam-2016]

  1. Pseudo dominance
  2. Dominance
  3. Epistasis
  4. Co-dominance

Incomplete Dominance

Explanation:
Dominance: In phenotypic characteristics, when one allele suppressed another, the phenomenon is known as Dominance.
The allele which suppressed another is known as dominant.
Suppressed allele is recessive.

Co-dominance: When two allele related to a particular trait exhibit its properties (i.e. no one is suppressed another), the phenomenon is called Co-dominance.

Pseudo-dominance: We know that a recessive allele to be expressed, both allele should be recessive i.e. homozygous recessive.
But there is a situation wherein only one recessive allele inherited and yet is expressed.  This phenomenon is known as Pseudo-dominance.

Incomplete dominance: In incomplete dominance, two allele inherited from parental generation form a new hybrid trait.

In Co-dominance, two allele are expressed but in Incomplete dominance two allele form new hybrid trait.

Here, Pure Red flowers bearing plant is crossed with a pure White flower and the F1 plant bears Pink flowers.
So, from Red and White a new hybrid Pink is formed. So, this is an example of Incomplete dominance.

Q. "Particulate theory of inheritance" was proposed by 
   [WBCS Preliminary Exam-2017]

  1. Charles Darwin
  2. Gregor Johann Mendel
  3. Herman Muller
  4. T. H. Morgan

B. Gregor Johann Mendel

Explanation:
"Particular theory of inheritance" was proposed by Gregor Johann Mendel.

EVOLUTION

Q. "Survival of the fittest" was coined by 
   [WBPSC Miscellaneous Exam-2012(2nd)]

  1. Darwin
  2. Lamarch
  3. Mendel
  4. Viseman

B. Darwin

Explanation: 

  • "Survival of the fittest" is coined by Charles Darwin. 
  • Charles Darwin is known as "Father of Evolution". 
  • He is author of the book "The Origin of Species".

Q. Darwin and Wallace were both strongly influenced by the book "An Essay on the Principle of Population" written by  
  [WBCS Preliminary Exam-2016]

  1. Erasmus
  2. Malthus
  3. Volterra
  4. Lamarck

B. Malthus

Explanation:
The author of the book "An Essay on the Principle of Population" is Thomas Robert Malthus.

ECOLOGY

Q. Which one of these is a sanctuary? 
   [WBPSC Miscellaneous Exam-2012(2nd)]

  1. Corbett
  2. Gorumara
  3. Sundarban
  4. Mudhumalai

D. Mudhumalai

Explanation:
Mudhumalai is a sanctuary.

Q. The Sultanpur Bird Sanctuary situated in which state?
   [WBPSC Miscellaneous Exam-2018]

  1. Haryana
  2. Uttar Pradesh
  3. Gujrat
  4. Assam

A. Haryana

Explanation:
The Sultanpur Bird Sanctuary is situated in Gurgaon district of Haryana.

Q. According to Competitive Exclusion Principle, two species cannot continue to occupy the same 
   [WBCS Preliminary Exam-2016]

  1. Biome
  2. Habitat
  3. Territory 
  4. Niche 

D. Niche

Explanation:
According to Competitive Exclusion Principle, two species cannot continue to occupy the same niche indefinitely.

Q. Sundarban is declared as "World Heritage site" for
   [WBCS Preliminary Exam-2019]

  1. Tiger reserve
  2. Sundari Tree
  3. Mangrove forest
  4. Biodiversity

C. Mangrove forest

Explanation: 

  • Sundarban is the largest mangrove forest in the world. 
  • Sundarban is Internationally recognized for its high biodiversity of mangrove flora and fauna both on land and water.

Q. Where is Vansda National Park located?
   [WBCS Preliminary Exam-2019]

  1. Uttar Pradesh
  2. Gujrat
  3. Rajasthan
  4. Madhya Pradesh

B. Gujrat

Explanation:
Vansda National Park is located in Navsari district, Gujrat.

BIOCHEMISTRY

Q. Enzymes are organic compounds of protein category which 
   [WBPSC Miscellaneous Exam-2012(2nd)]

  1. act as catalyst in life process
  2. help in the mechanism of supply of oxygen in blood
  3. help to regulate the manner and rate of use of glucose in body
  4. help in heredity maintenance

A. act as catalyst in life process

Explanation: 

  • Enzymes are proteins that act as biological catalysts. 
  • Enzymes help to speed up the chemical reactions occurred in the body.

Q. Which following process makes direct use of Oxygen?
   [WBCS Preliminary Exam-2017]

  1. Glycolysis
  2. Fermentation
  3. Citric Acid cycle
  4. Electron transport

D. Electron transport

Explanation:
Electron transport makes direct use of Oxygen.

Q. If a person addicted to alcohol, the liver gets damaged because it 
   [WBCS Preliminary Exam-2019]

  1. has to detoxify the alcohol
  2. stores excess of glycon
  3. is over stimulated to secrete more bile
  4. accumulates excess of fats

C. is over stimulated to secrete more bile

Explanation:
If a person addicted to alcohol, the liver gets damaged because it is over stimulated to secrete more bile.

MEDICAL INSTRUMENT & TESTS

Q. Who has developed the contact lens sensors to monitors things like stress hormones, uric acid, pressure sensing for glaucoma? 
  [WBPSC Miscellaneous Exam-2018]

  1. Professor Kit
  2. Professor Greg Herman
  3. Professor Sensor
  4. Professor Black William

B. Professor Greg Herman

Explanation:
A team of researchers of Oregon State University in the US developed the contact lens sensors to monitor things like stress hormones, uric acid, pressure sensing for glaucoma.
The leader of the team was Professor Gregory Herman.

Q. what is angiogram?
   [WBPSC Miscellaneous Exam-2018]

  1. It is a medical diagnostic test.
  2. It is a signal used in telegram office.
  3. It is a signal used in radio.
  4. It is a signal used in TV.

A. It is a medical diagnostic test.

Explanation: 

  • Angiogram is a medical imaging technique to visualize the blood vessels. 
  • In this process, X-ray is used for imaging. 
  • Coronary angiogram is used to see heart's blood vessels.

Q. Which one of the following is not medical diagnostic test?
   [WBPSC Miscellaneous Exam-2018]

  1. Colonoscopy test
  2. McNaughton test
  3. Doppler test
  4. C. T. Scat test

B. McNaughton test

Explanation: 

  • Colonoscopy test: This test is to see inside the large intestine. 
  • McNaughton test: This test is used to determine whether a person accused of a crime was sane at the time of crime or not.
    This is not a medical diagnostic test. 
  • Doppler test: It is a medical test used to estimate the blood flow through blood vessels using ultrasound . 
  • C. T. Scan test: CT (computed tomography) scan is a medical diagnostic test used to produce 3D image of soft tissue and bones.

Q. What is the function of electrocardiogram test?
   [WBPSC Miscellaneous Exam-2018]

  1. It measures the legs function.
  2. It measures the blood flow.
  3. It measures the brain cells.
  4. It measures the heart beat.

D. It measures the heart beat.

Explanation:

  • Full form of ECG is Electrocardiogram.
  • ECG is used to check heart's rhythm and electrical activity. 

Q. Oral Glucose Tolerance test is used for determining 
   [WBPSC Miscellaneous Exam-2018]

  1. Blood sugar
  2. Blood Pressure
  3. Obesity
  4. Heart Attack

A. Blood sugar

Explanation:
Oral glucose Tolerance test is used for determining blood sugar.

Q. ECG records 
   [WBCS Preliminary Exam-2019]

  1. rate of heart beats
  2. potential difference
  3. ventricular concentration
  4. volume of blood pump

B. potential difference

Explanation: 

  • The full form of ECG is Electrocardiogram. 
  • ECG is produced by measuring the electrical activity generated by the heart.



WBPSC Prevoius Year BIOLOGY Questions with Answers Part-1

WBPSC Previous Year BIOLOGY Questions with Answers Part-2 

WBPSC Previous Year BIOLOGY Questions with Answers Part-3 

WBPSC Previous Year PHYSICS Questions with Answers 

WBPSC Previous Year CHEMISTRY Questions with Answers 

WBPSC Previous Year COMPUTER Questions with Answers 

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