Question # 1

In Animals, exchange of gaes occure through.

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Liver

Heart

Brian

Lungs

The structure in plants used to produce food for plant is.

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Stem

Root

Branch

Leaf

While preparing pickles, which is not used as preserating agent.

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Honey

Salt

Pepper

Vinegar

Entry and growth of pathogen into our body is called.

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Pathogen

Infection

Immunity

None of these

The outermost layer of a root is called.

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Epidermis

Endodermis

Cortex

Xylem

While writing a chemical formula positive ionis written on.

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Right

Left

Center

All of these

During combustion, a substance reacts with

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Hydrogen

Water

Oxygen

Carbon di oxide

Which of the following features of a wave is the number of waves that pass by each second.

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Loudness

Amplitude

Frequency

Wave speed

The elements of group 18 are called.

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Alkali metals

Noble gases

Alkaline metals

Transition metals

Atomic number of element presetnin period 2 and group 15 of the periodic table.

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4

5

6

7

The Earth completes one revolutin around the Sun in days.

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28

29

365

370

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