Explanation

• A lever is a stiff bar that rests on a support called a fulcrum, which lifts or moves loads.
• The fulcrum is the point where the lever pivots, and it can be used to change the direction of a force or to gain a mechanical advantage, making it easier to lift or move heavy loads.
• Examples: Hammer, crow bar, a pair of pilers and seesaw.

Explanation

• Bacteria are unicellular organisms.
• They have cell wall but don't have proper nucleus.
• It doesn't contain chlorophyll.
• It is used to make medicines, yogurt and cheese.
• Algae are unicellular with proper cell wall and nucleus.
• It contain chlorophyll.
• It causes diseases: Cutleria, Ulva and Volvox.

Explanation

• Liquids can be converted into solids by cooling, a process known as freezing or solidification.
• As the temperature decreases, the particles of the liquid slow down and come together, forming a solid.

Explanation

• Plants prepare their food (glucose) through photosynthesis.
• Which requires sunlight, water, carbon dioxide, and chlorophyll.
• Sunlight provides the energy needed to power the photosynthetic process.

Explanation

A converging lens (also known as a convex lens) refracts parallel rays of light and converges them at a single point, called the focal point.

Explanation

• Tartaric acid is a white, crystalline organic acid that occurs naturally in many fruits, most notably in grapes and tamarinds.
• It also found in bananas, avocados, and citrus fruits.

Explanation

• The given reaction, CaO + CO2 → CaCO2, is an example of a Combination Reaction, also known as a Synthesis Reaction or Addition Reaction.
• In this reaction, two substances, calcium oxide (CaO) and carbon dioxide (CO2), combine to form a single compound, calcium carbonate (CaCO2).

Explanation

MMR vaccines are given to children to develop resistance against:

• Measles
• Mumps
• Rubella (German measles)

Explanation

• During Prophase, the chromatin condenses and becomes visible as chromosomes.
• This is the stage where the chromatin becomes thickened, shortened, and organized into visible chromosomes.

Explanation

• When an atom gains or loses electrons, it becomes an ion.
• If it gains electrons, it becomes a negative ion (anion).
• It it loses electrons, it becomes a positive ion (cation).