Explanation

Belief is defined as a state or habit of mind in which trust or confidence is placed in some person or thing.

It involves having a conviction that something is true or reliable. 

Explanation

Decibel (dB) measures the intensity or loudness of sound.

It is a logarithmic unit, meaning each 10 dB increase represents a tenfold increase in intensity.

Decibels are also used in electronics and signal strength measurements.

It does not measure speed of light or heat.

Common examples: Normal conversation ≈ 60 dB, threshold of hearing ≈ 0 dB, jet engine ≈ 120 dB.

Explanation

Explanation

• Nutritive foods supply the body with necessary nutrients for growth, energy, and repair.
• They include all food groups that contribute to balanced nutrition.

Additional information:

• Cereals provide carbohydrates for energy.
• Vegetables and fruits provide vitamins and minerals.
• Meat provides proteins and iron for body-building.

Last verified on 20-01-2026

Explanation

• Compounds with the same molecular formula but different arrangements of atoms are called isomers.
• Isomers can have different chemical and physical properties despite having the same number of atoms.

• Additional information:
  • Example of isomers: C₂H₆O → Ethanol (CH₃CH₂OH) and Dimethyl ether (CH₃OCH₃)
  • Isomerism is classified into structural isomers and stereoisomers.

Explanation

• Glycerin (glycerol) is a colorless, odorless, and viscous liquid.
• It is commonly used in pharmaceuticals, cosmetics, and food products.

Additional information:

• Glycerin is non-toxic and safe in small quantities.
• It acts as a humectant, helping retain moisture.

Last verified on 20-01-2026

Explanation

• Xerophytes are plants adapted to survive in dry or low-water environments.
• They have special features to reduce water loss and store water.

Additional information:

Examples of xerophytes:

• Cactus
• Aloe vera
• Date palm
• Acacia
• Euphorbia

Last verified on 19-01-2026

Explanation

• Meristematic cells are undifferentiated cells capable of continuous division.
• They are responsible for the growth of plants in length and thickness.

Additional information:

Types of meristems:

• Apical meristem – root & shoot tips
• Intercalary meristem – nodes & internodes
• Lateral meristem – increase in girth
• Root meristem – root growth
• Shoot meristem – shoot growth

Last verified on 19-01-2026

Explanation

• In plants, carbohydrates are stored mainly in the form of starch.
• Starch serves as an energy reserve used during growth and development.

Additional information:

Storage forms in plants:

• Starch – main carbohydrate reserve
• Sucrose – transport form of carbohydrate
• Cellulose – structural carbohydrate
• Glycogen – storage carbohydrate in animals
• Glucose – immediate energy source

Last verified on 19-01-2026

Explanation

• Comets are small celestial bodies made of ice, dust, and rock.
• When they approach the Sun, they form bright tails of gas and dust.

• Often called “dirty snowballs” due to icy composition.
• Comets follow highly elliptical orbits around the Sun.

Last verified on 19-01-2026