Explanation

"A egg" is incorrect because "egg" begins with a vowel sound, so it should be "an egg".

Use "an" before words that start with a vowel sound (a, e, i, o, u).

Explanation

Stomata are tiny pores (usually on leaves) that allow gas exchange (CO₂ in for photosynthesis, O₂ out).

They also regulate water vapor release (transpiration).

Explanation

The expression {x|x ∈ A ∨ x ∈ B} represents the set of elements that are in A or in B or in both.

This is the definition of the union of two sets, denoted as A ∪ B.

Explanation

The Indus River is the lifeline of Pakistan’s agriculture, supporting the largest irrigation system.

It irrigates vast lands in Punjab and Sindh, making it crucial for food production and economy.

Explanation

Irrational numbers cannot be expressed as fractions and have infinite non-repeating decimals.

Examples include √2, π, which do not terminate or repeat in decimal form.

Explanation

The prefix "dis-" means opposite of or not, and when added to "agreement", it becomes "disagreement".

"Disagreement" means a lack of agreement or conflict in opinion.

Explanation

The sentence uses a first conditional structure with "If + present tense", so the result clause should use "will" or simple present, not "would".

"Would" is used in second conditionals (with past tense in the "if" clause), so it's incorrect here with "treats".

Correct sentence: If a teacher treats students nicely, they will always listen to her.

Explanation

The judiciary in Pakistan plays a key role in interpreting the Constitution and laws of the country.

It ensures justice, protects fundamental rights, and maintains checks and balances on the executive and legislative branches.

Explanation

Filtration is used to separate an insoluble solid (like sand) from a liquid (like water).

The sand stays on the filter paper, while the water passes through.

Explanation

The pH scale ranges from 1 to 14, with:

• 1-6 being acidic
• 7 being neutral (neither acidic nor basic)
• 8-14 being basic (alkaline)