Quiz 282 – Previous Years’ Biology Questions with Explained Answers

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biology

Assertion (A): Dolly was the first cloned mammal.

Reason (R): Dolly was produced by in vitro fertilization.

(a) Both A and R is true and R is the correct explanation of A.

(b) Both A and R is true but R is not the correct explanation of A.

(c) A is true but R is false.

(d) A is false but R is true.

Explanation:

Assertion is wrong because dolly is not first cloned mammal. A mice was cloned in 1984.

Ans- (d)


 

Which of the following are associated with diabetes mellitus, a common disease in adults?

  1. Higher sugar level in blood
  2. Lower sugar level in blood
  3. Lower insulin level in blood
  4. Higher insulin level in blood

Select the correct answer by using the codes given below:

Codes:

(a) 2 and 4

(b) 1 and 2

(c) 2 and 3

(d) 1 and 3

Explanation:

Diabetes mellitus is caused due to deficiency of hormone insulin, secreted by pancreas. Insulin helps in maintaining a constant blood sugar level.

Ans- (d)


 

Assertion (A): Insect resistant transgenic cotton has been produced by inserting Bt gene.

Reason (R): The Bt gene is derived from a bacterium.

(a) Both A and R are true and R is the correct explanation of A.

(b) Both A and R are true but R is not the correct explanation of A.

(c) A is true but R is false

(d) A is false but R is true

Explanation:

Bt-cotton is a transgenic crop. Transgenic plants are those plants, which have foreign gene incorporated in their DNA. This insect resistant gene is derived from a bacterium, Bacillus thuringiensis.

Ans- (b)


 

“Athlete’s Foot” is a disease cause by:

(a) Bacteria

(b) Protozoan

(c) Nematode

(d) Fungus

Explanation:

“Athlete’s foot” or Trichophyton is caused by fungus. It is a disease in which infection occurs between the toes.

Ans- (d)


 

Match List – I (Scientists) with List – II (Achievements) and select the correct answer using the codes given below:

List – I (Scientists)

A. Arber and Smith

B. Feldman

C. Mullis

D. Temin and baltimore

List – II (Achievements)

  1. Developed transgenic plants with Agrobacterium T-DNA
  2. Discovered endonucleases
  3. Discovered reserve transcriptase
  4. Discovered polymerasre chain reation

Codes: A – B – C – D

(a) 1 – 2 – 4 – 3

(b) 2 – 1 – 4 – 3

(c) 2 – 1 – 3 – 4

(d) 1 – 2 – 3 – 4

Explanation:

 Arber and Smith – Discovered endonucleases

Feldman – Developed transgenic plants with Agrobacterium T-DNA

Mullis – Discovered polymerasre chain reation

Temin and Baltimore – Discovered reverse transcriptase

Ans- (b)


 

 

When one gene control two or more different characters simultaneously, the phenomenon is called:

(a) Polyploidy

(b) Apomixis

(c) Polyteny

(d) Pleiotropy

Explanation:

Pleiotropy is the condition in which a single gene influences more than one trait.

Polyploidy is a condition in which individuals have more than two complete sets of chromosomes.

Apomixis is a reproductive process in plant that superficially resembles normal sexual reproduction but there is no fusion of gametes.

Ans- (a)


 

Which one of the following statements is correct?

(a) Viroids consist of single-stranded RNA molecule

(b) The cell wall of mycoplasmas is made up of molecule

(c) Prions are the smallest free-living cells.

(d) Rickettsias lack cell wall.

Explanation:

Viroids is a small infective segment of nucleic acid, usually RNA.

Prion is an infectious pathogenic agent devoid of nucleic and composed mainly of proteins.

Mycoplasmas lack a cell wall white Rickettsias possess a cell wall.

Ans- (a)


 

Assertion (A): Drinking of whisky increases the frequency of urination.

Reason (R): Alcohol intake speeds up the secretion of vasopressin in the body.

(a) Both A and R are true and R is the correct explanation of A.

(b) Both A and R are true but R is not the correct explanation of A.

(c) A is true but R is false

(d) A is false but R is true

Explanation:

Both Assertion and Reason are correct and R explained A correctly.

Ans- (a)


 

Assertion (A): Human diet should compulsorily contains glycine, serine and tyrosin.

Reason (R): Essential amino acids can not be synthesized in the human body.

(a) Both A and R are true and R is the correct explanation of A.

(b) Both A and R are true but R is not the correct explanation of A.

(c) A is true but R is false

(d) A is false but R is true

Explanation:

Assertion is false but Reason is true. Essential amino acids are those which are taken from food and not synthesized in the body whereas non-essential amino acids need not be supplied in the diet and synthesized in the boy.

Ans- (a)


 

Which one of the following hormones contains iodine

(a) Thyroxin

(b)Adrenaline

(c) Testosterone

(d) Insulin

Explanation:

The main secretion of thyroid gland is called thyroxin.

Ans- (a)


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3 COMMENTS

  1. one correction …
    alcohol intake not increases it reduces vasopressin or ADH secretion which leads to increased to increased urination.

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