Explanation

Each mesophyll cell in a leaf typically contains about 20 to 100 chloroplasts, depending on the plant species.

These chloroplasts are the site of photosynthesis, capturing sunlight to produce food.

Explanation

The desert ecosystem of Bhakkar and Mianwali districts in Punjab, Pakistan is known as the Thal Desert.

It is a sandy, arid region located between the Indus and Jhelum rivers.

Explanation

The breakdown of alveoli in the lungs is called Emphysema. 

Emphysema is a lung condition where the small air sacs (alveoli) are damaged, causing them to break down and merge into larger spaces, reducing the surface area available for gas exchange. 

Explanation

 Sweet peas are annual climbing plants with fragrant, butterfly-shaped flowers. 

They are part of the genus Lathyrus within the Fabaceae family. 

The name Lathyrus is derived from the Greek word for "pea," and odoratus means "scented". 

They are cultivated for their beautiful and fragrant flowers.

Explanation

A protostome is an animal where the first opening that forms during embryonic development (the blastopore) becomes the mouth.

While the second opening develops into the anus. 

Explanation

To prepare 250 cm³ (or 250 mL) of a 1 M NaOH solution, you need 10 grams of NaOH.

This is because the molar mass of NaOH is 40 g/mol, and a 1 M solution contains 1 mole of solute per liter of solution.

Therefore, 250 mL (0.25 L) of a 1 M solution would require 0.25 moles of NaOH, which translates to 10 grams (0.25 moles * 40 g/mol). 

Explanation

Explanation

Explanation

Explanation