Explanation

He had his breakfast at 9 o’clock.

The sentence refers to a specific time in the past ("at 9 o’clock"), so the correct tense is simple past.

"Had" is the simple past tense of "have," and it fits well with a completed past action at a specific time.

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

The enzyme that converts sucrose into glucose and fructose is called invertase

It is also known as sucrase or beta-fructofuranosidase.

This process is known as hydrolysis, where water is used to break the glycosidic bond between glucose and fructose in sucrose.

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

Calcium chloride (CaCl₂) is a hygroscopic substance, meaning it absorbs moisture from the air.

It is commonly used as a drying agent in desiccators to keep the environment moisture-free.

Explanation

 Lodicules are small, scaly structures found at the base of a grass flower.

They are essentially modified parts of the perianth, which is the non-reproductive part of a flower.

The perianth consists of sepals and petals (or tepals if they are undifferentiated).

In grasses, the perianth is reduced and modified into these small scales called lodicules.

Explanation

Robert Koch established the germ theory of disease by demonstrating a causal relationship.

Between specific microorganisms and particular diseases, most notably with his research on anthrax.

Explanation

The intestinal parasite that causes amoebic dysentery in humans is Entamoeba histolytica.

Amoebic dysentery is a disease caused by the protozoan parasite Entamoeba histolytica. 

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

Microfilaments (mainly made of actin) are responsible for cell movements like cyclosis (cytoplasmic streaming) and amoeboid movement.

They help in changing cell shape, enabling movement in amoebas and streaming in plant cells.