Explanation

Xylem transports water and dissolved mineral salts upward from the roots to the leaves.

It plays a key role in plant hydration and nutrient distribution for photosynthesis.

Explanation

He asked them if they would listen to such a man.

In indirect speech, the question form "Will you" changes to "if they would" and the pronouns are adjusted accordingly.

The reporting verb "said to" changes to "asked" in a question.

Explanation

"That" is correctly used to refer to people or animals in a defining clause.

The sentence means man is the only animal that can think positively about human progress.

Explanation

Archaeologists have discovered approximately 3000 Indus Valley seals at various sites.

These seals often feature animals and script.

They were likely used for trade and identification.

Explanation

Greenhouses are structures designed to provide an optimal environment for plants, particularly during colder seasons.

They trap sunlight, creating a warmer, more stable temperature that promotes plant growth in winter or colder climates.

Explanation

Sheikh Alam Din Ansari served as a Royal Physician during the Mughal period.

He was known for his medical expertise and service in the royal court.

Explanation

Nuclear energy is produced by splitting atoms (fission) and relies on uranium, a finite resource, making it non-renewable.

Renewable sources like solar, geothermal, and biomass naturally replenish over time.

Explanation

"Or" is used to show a choice or alternative between two options: hardworking or lazy.

The sentence is asking which one applies, not contrasting or adding, so "or" fits best.

Explanation

In dicot seeds, cotyledons store nutrients that nourish the growing embryo.

They often also help in the early stages of photosynthesis after germination.

Explanation

The sentence is in simple present tense, so the passive voice follows the structure:

Object + is/are + past participle + by + subject

Hence, "Pets are kept by Elizabeth" is correct.