Explanation

Threadworms (pinworms) commonly cause itching around the anus, especially at night when female worms lay eggs.

This itching is the most common symptom, particularly in children.

Explanation

The correct phrase is "afraid of", which is always followed by a noun, pronoun, or gerund (like being dropped).

"Afraid of" is the standard prepositional phrase used to express fear about something.

Explanation

Discontinuous variation involves traits like blood group or tongue rolling, where individuals fall into clear, separate categories.

There are no intermediate states—either you have the trait or you don’t.

Explanation

Reforming is the process used to separate hydrogen from hydrocarbons (like methane or naphtha) by applying heat in the presence of a catalyst.

This is typically called steam methane reforming (SMR).

Explanation

"Taller" is the correct comparative form of the regular adjective "tall".

Regular adjectives typically form the comparative by adding “-er” (e.g., tall → taller).

Explanation

Given x = 1 is a solution, let's find 'a':

a(1)² + 5(1) - 3 = 0

a + 2 = 0

a = -2

The equation is -2x² + 5x - 3 = 0.

Let's factor or solve:

-2x² + 5x - 3 = 0

-2x² + 2x + 3x - 3 = 0

-2x(x - 1) + 3(x - 1) = 0

(-2x + 3)(x - 1) = 0

x = 1 (given) or x = 3/2

The other solution is x = 3/2.

Explanation

In negative sentences, we use "anything" instead of "something" or "nothing."

The phrase "we cannot do anything about it" is grammatically correct.

Explanation

A biographical essay about a deceased person is usually written in the past tense.

This is because it describes events and actions that have already happened in the person's life.

Explanation

The first recorded Pashto poem is attributed to Amir Kror Suri.

It is thought to have been written in the 8th century CE (2nd Hijri century).

Explanation

Normal salts are formed when all replaceable hydrogen atoms in an acid are replaced by metal ions.

They do not contain any replaceable hydrogen or hydroxyl groups.