Explanation

in the early 1950s, the first successful vaccine was created by US physician Jonas Salk.

Salk tested his experimental killed-virus vaccine on himself and his family in 1953

First used Salk vaccine in 1955 ( in activated)

while 

A live attenuated (weakened) oral polio vaccine developed by Dr. Albert Sabin and first used in 1961.

Israel launched a polio vaccine drive after 1988 in April 2022

ND10-3-2023

Explanation

The most important risk factor for lung cancer is tobacco smoking.

Experts estimate 85 to 90% of lung cancers are due to smoking.

Explanation

Every planet in our solar system except for Venus and Uranus rotates counter-clockwise as seen from above the North Pole; that is to say, from west to east.

This is the same direction in which all the planets orbit the sun. Uranus was likely hit by a very large planetoid early in its history, causing it to rotate "on its side," 90 degrees away from its orbital motion.

Venus rotates backwards compared to the other planets, also likely due to an early asteroid hit which disturbed its original rotation.

Explanation

Microbiology is the scientific study of microorganisms, those being unicellular, multicellular, or acellular.

Important GK 

Agrostology: Study of Grasses 

Agronomy: soil management and crop production 

Odontology: study of teeth 

Arthrology:Study of joints 

Nephrology: study of kidneys

Hematology: Study of blood  

Dermatology:  Study of skin 

Explanation

The retina of the eye is comparable to the film of a traditional camera.

Retina is a film of nerve fibers.

The image of the object is formed at the retina just like camera film is used to see the images. 

ND16-3-2023

Explanation

Colour of the plants is green due to the presence of Chlorophyll۔

Chlorophyll absorbs certain wavelengths of light within the visible light spectrum.

Chlorophyll is the green color pigment which absorbs wavelength from sunlight.

Since the synthesis of food occurs in the presence of sunlight, it is called photosynthesis. 

Explanation

In mechanics, acceleration is the rate of change of the velocity of an object with respect to time.

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RY12-02-23

Explanation

Extinct:

(of a species, family, or another group of animals or plants) having no living members; no longer in existence

ND17-1-2023

Explanation

Graphite is used for making the electrode in a dry cell.

Graphite is a good conductor of electricity, in fact, as good as metals

Graphite is used as an electrode because it conducts electricity without taking part in the chemical reaction

ND5.3.2023

Explanation

The muscles, tissues, and blood all are made up of Proteins

Muscle tissue is composed of cells that have the special ability to shorten or contract in order to produce movement of the body parts.

The tissue is highly cellular and is well supplied with blood vessels.

The cells are long and slender so they are sometimes called muscle fibers,

and these are usually arranged in bundles or layers that are surrounded by connective tissue.

Actin and myosin are contractile proteins in muscle tissue.

Muscle tissue can be categorized into:

skeletal muscle tissue,

smooth muscle tissue,

and cardiac muscle tissue.

ND5.3.2023