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  • SSC CGL Exam General Awareness Study Material

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A clone is a group of individuals obtained through

a) Hybridisation
b) Micropropagation
c) Cross pollination
d) Self pollination

Correct Answer Is : Micropropagation
Solution Is : Micropropagation is the practice of rapidly multiplying stock plant material to produce large number of progeny plants, using modern plant tissue culture methods. It leads to the production of plants that are clones of each other. It often produces more robust plants, leading to accelerated growth compared to similar plants produced by conventional methods - like cutting
Interferons are synthesized in response to

a) Bacteria
b) Fungi
c) Mycoplasma
d) Virus

Correct Answer Is : Virus
Solution Is : Interferons (IFNs) are a group of signalling proteins made and released by host cells in response to the presence of pathogens, such as viruses, bacteria, parasites or tumour cells. Interferon synthesis occurs primarily in response to viral single-stranded RNA that are either the genetic material of RNA viruses or a product of viral transcription. Interferons are named for their ability to "interfere" with viral replication by protecting cells from virus infections.
The resources Which are obtained from bio sphere and have life are :

a) Potential resources
b) Biotic resources
c) Abiotic resources
d) Renewable resources

Correct Answer Is : Biotic resources
Solution Is : Biotic resources describe living or once living resources of a community; for example organism, such as plants and animals, They are obtained from the biosphere and have life. The resources which are composed of non-living things are called abiotic Resources. For example water, minerals metals , wind, solar energy etc.
The hydrophilic nature of DNA is due to the presence of :

a) Thymine base
b) A number of hydrogen bonds
c) Phosphate group
d) Deoxyribose sugar

Correct Answer Is : A number of hydrogen bonds
Solution Is : The phosphate groups on DNA are ionic and charged. Each phosphate group on the DNA backbone is one unit of negative charge (-1) charged molecules attract water and are hydrophilic. DNA has two hydrophilic polar external backbones made of sugars and phosphate groups joined by ester bonds.
The sense of balance is achieved by :

a) Cerebrum equilibrium
b) Thalamus equilibrium
c) Cerebellum equilibrium
d) Spinal chord equilibrium

Correct Answer Is : Cerebellum equilibrium
Solution Is : The cerebellum equilibrium controls the aspects of balance, equilibrium, and muscle tone, which are factors that provide for smooth movement and activity. Electrical impulses from the cerebellum stimulate muscles that are responsible for voluntary movement, and it works in coordination with the motor cortices of the cerebrum for this overall function.
The concept of tissue culture was introduced by

a) Halfmeister
b) Hanstein
c) Haberlandt
d) Hanning

Correct Answer Is : Haberlandt
Solution Is : Wilhelm Roux is credited with the establishment of the basic principle of tissue culture in 1885. However, it was Gottlieb Haberlandt, an Austrian botanist, who first pointed out the possibilities of the culture of isolated tissues, plant tissue culture.
In an oxygen molecule, two atoms are united by

a) One bond
b) Two bonds
c) Three bonds
d) Four bonds

Correct Answer Is : Two bonds
Solution Is : Two oxygen atoms can both achieve stable structures by sharing two pairs of electrons as in the diagram. Two electrons of each of the atom in the oxygen molecule make the double bond with each other. The double bond is shown conventionally by two lines joining the atoms. Each line represents one pair of shared electrons.
The inert gas which is substituted for nitrogen in the air used by deep sea divers for breathing is

a) Neon
b) Krypton
c) Argon
d) Helium

Correct Answer Is : Helium
Solution Is : Helium is used by deep sea divers because it reduces the narcosis of nitrogen and it remains below the oxygen toxicity limits. In fact, they use tri mix of Oxygen, helium and a little bit of nitrogen.
Cell becomes turgid because of

a) Plasmolysis
b) Exosmosis
c) Endosmosis
d) Diffusion

Correct Answer Is : Endosmosis
Solution Is : When the plant cell is placed in a hypotonic solution, it takes up water by osmosis and starts to swell, but the cell wall prevents it from bursting. The plant cell is said to have become "turgid" i.e. swollen and hard. So it is because turgid.
A cell increases in volume when it is placed in

a) Hypertonic Solution
b) Hypotonic Solution
c) Isotonic Solution
d) None of these

Correct Answer Is : Hypotonic Solution
Solution Is : When a cell is placed in a hypotonic solution, water rushes into the membrane, increasing the cell`s volume. Eventually the cell`s membrane is enlarged such that it pushes against the cell`s rigid wall. At this point the cell is said to be turgid.
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