Explanation

World Brain Day is observed on 22 July annually.

Theme 2023: Brain Health and Disability- Leave No One Behind

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World Brain Tumor Day is observed on June 8

Explanation

A light microscope can magnify up to 1000x (typical maximum), resolving structures as small as 0.2 micrometers.

This is ~1000x sharper than the naked eye (which resolves ~0.2 mm).

Explanation

The function y = x + 100 is in the slope-intercept form y = mx + c, where:

m = 1 (slope)

c = 100 (y-intercept)

This confirms that the graph of the function is a straight line.

Explanation

Add and Added show a change from present to past tense.

Say and Said also represent present to past tense, matching the same pattern.

Explanation

Equisetum is commonly called horse-tail due to its brush-like appearance.

It belongs to Pteridophytes.

It is a living fossil.

It is found near wetlands.

Explanation

Hirudinaria is a genus of leeches, which are segmented worms.

Leeches belong to the phylum Annelida, known for segmented bodies.

Explanation

Parasites are classified as ectoparasites (living on the surface) and endoparasites (living inside the host).

Both types represent different forms of parasitic symbiosis with their hosts.

Explanation

Aldehydes and ketones contain a polar carbonyl group (C=O) which is susceptible to nucleophilic attack.

They commonly undergo nucleophilic addition reactions, a key feature of their reactivity.

Explanation

Blood type O has no A or B antigens on the surface of red blood cells.

That's why type O is known as the universal donor in blood transfusion.

Explanation

Boron is a metalloid, showing properties between metals and non-metals.

Aluminum is a metal.

Phosphorus is a non-metal.