Science CET practice exam

Front

What is lactose and why can some people not digest it?

Back

Lactose is a disaccharide sugar found in milk and dairy products. Some people cannot digest it due to a lack of the enzyme lactase, leading to symptoms like loose bowel movements.

Front

What is the role of producers in a food chain?

Back

Producers, such as plants, are organisms that create their own food through photosynthesis and form the base of the food chain.

Front

What is a primary consumer?

Back

A primary consumer is an organism that eats producers. In aquatic ecosystems, phytoplankton are examples of primary producers, not consumers.

Front

What biome is characterized by a thick fur coat in animals and long periods of dormancy?

Back

The Tundra biome is characterized by cold temperatures, thick fur coats in animals, and long periods of dormancy.

Front

What happens to gas molecules when a gas is heated in a sealed cylinder?

Back

When a gas is heated, the average kinetic energy, speed, and number of gas molecules hitting the walls increase, but the average distance between gas molecules does not necessarily increase.

Front

What is the significance of hydrogen bonds in undigested lactose?

Back

Undigested lactose can form hydrogen bonds with water in the intestines, leading to watery stool and loose bowel movements.

Front

What is the difference between a secondary consumer and a final consumer?

Back

A secondary consumer eats primary consumers, while a final consumer is at the top of the food chain and has no natural predators.

Front

What is the function of enzymes in digestion?

Back

Enzymes, like lactase, facilitate the breakdown of complex molecules into simpler ones, aiding in digestion.

Front

What is the impact of a food chain disruption?

Back

Disruption in a food chain can lead to overpopulation or extinction of species, affecting the entire ecosystem.

Front

What is the relationship between temperature and gas pressure in a sealed container?

Back

In a sealed container, increasing the temperature of a gas increases its pressure, as the molecules move faster and collide more frequently with the walls.