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Q:

Which of the following statements is true?

A) In grasshoppers and some insects, the male has only four sex chromosomes B) A male individual contains one X and two Y chromosomes
C) In human beings, there are 46 chromosomes, of which 42 (21 pairs) are autosomes D) In diploid organisms having separate sexes, a specific pair of chromosomes in each diploid cell determines the sex of the individual, they are called sex chromosomes.  
 
Answer & Explanation Answer: D) In diploid organisms having separate sexes, a specific pair of chromosomes in each diploid cell determines the sex of the individual, they are called sex chromosomes.  

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Q:

Plants bend towards light due to the diffusion of the ____ hormone on the other side of the shoot.

A) abscisic acid B) auxin
C) cytokinin D) gibberellin
 
Answer & Explanation Answer: B) auxin

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Q:

Hybrid zones provide an opportunity to investigate

A) Reproductive isolation B) Speciation
C) Both 1 & 2 D) None
 
Answer & Explanation Answer: C) Both 1 & 2

Explanation:

Hybrid zones are geographical areas where two interbreeding groups of genetically unique organisms meet. Hybrid zones provide an opportunity to investigate Reproductive isolation and Speciation.

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Q:

Parthenocarpy is defined as

A) Development of root without fertilisation B) Development of fruit without fertilisation
C) Development of fruit with fertilisation D) Development of root with fertilisation
 
Answer & Explanation Answer: B) Development of fruit without fertilisation

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Q:

Which of the following is not regarded as helpful to compost?

A) Egg shells B) Sawdust
C) Tea-bags D) Fish bones
 
Answer & Explanation Answer: D) Fish bones

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Q:

Which of the following is a nitrogen-fixing bacteria?

A) Salmonella B) Rhizobium
C) E.coli D) Pseudomonas
 
Answer & Explanation Answer: B) Rhizobium

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Q:

The universal natural auxin of plants is

A) IBA B) Citric auxin
C) NAA D) IAA
 
Answer & Explanation Answer: D) IAA

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Q:

_____ often referred to as a shock treatment, is a psychiatric treatment in which seizures are electrically induced in patients to provide relief from psychiatric illnesses.

 

A) Electromyography (EMG) B) Electrocardiogram (ECG)
C) Electroencephalography (EEG) D) Electroconvulsive therapy (ECT)
 
Answer & Explanation Answer: D) Electroconvulsive therapy (ECT)

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