Explanation

The nucleus is primarily composed of protons and neutrons, collectively called nucleons.

Explanation

• Chlorination is the process of adding disinfectants, such as chlorine, to water to kill harmful microorganisms.
• It prevent the spread of waterborne diseases.

Explanation

• The color of a star is primarily determined by its surface temperature.
• Stars come in a range of colors, including red, orange, yellow, white, and blue, which are indicative of their surface temperatures.
• The hotter the star, the bluer it appears, while the cooler the star, the redder it appears.

Explanation

• An ecosystem includes all the living components (biotic factors) like plants, animals, and microorganisms, and non-living components (abiotic factors).
• Like soil, water, air, and sunlight, interacting with each other.

Explanation

• Phosphorus-32 is used to identify the efficiency rates of organic and inorganic fertilizers.
• It is a radioactive isotope that helps track the uptake and utilization of phosphorus by plants.

Explanation

• The hottest stars appear blue in color.
• Blue stars are very hot, with surface temperatures reaching tens of thousands of degrees Celsius.
• It emitting predominantly blue and ultraviolet light.

Explanation

• In the periodic table, a columns is considered to be a groups (also known as a family or column).
• Groups are the vertical columns of elements in the periodic table.

Explanation

Explanation

Hepatitis is a disease of the liver, not the respiratory system.

Top Common diseases of the respiratory system include:

1. Asthma
2. Chronic obstructive pulmonary disease (COPD)
3. Pneumonia
4. Influenza (flu)
5. Tuberculosis (TB)
6. Bronchitis
7. Emphysema
8. Lung cancer
9. Cystic fibrosis
10. Pulmonary fibrosis

Explanation

• The de-oxygenated blood from the heart comes to the lungs through the Pulmonary artery
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• The deoxygenated blood returns from the body to the right atrium and from there enter the right ventricle that pumps it to the lungs through the main pulmonary artery (pulmonary trunk).
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• The pulmonary veins transport oxygenated blood back to the heart from the lungs