The pollutants released by jet planes are

The pollutants released by jet planes are

Options

(a) fogs (b) smogs (c) colloides (d) aerosols

Correct Answer:

aerosols

Explanation:

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Bone marrow is absent in

Bone marrow is absent in

Options

(a) fishes (b) birds (c) reptilia (d) amphibia

Correct Answer:

birds

Explanation:

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In hilly areas, erosion is minimised by

In hilly areas, erosion is minimised by

Options

(a) Terracing (b) Manuring (c) Ploughing (d) Mixed cropping

Correct Answer:

Terracing

Explanation:

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Antibiotics are mostly got from

Antibiotics are mostly got from

Options

(a) Fungi (b) Actinomycetes/Bacteria (c) Fungi & Actinomycetes/Bacteria (d) Cyanobacteria

Correct Answer:

Fungi & Actinomycetes/Bacteria

Explanation:

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Active immunity means

Active immunity means

Options

(a) resistance developed after disease (b) resistance developed before disease (c) increasing rate of heart beat (d) increasing quantity of blood

Correct Answer:

resistance developed after disease

Explanation:

No […]

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