3N EOY 2022 MCQ

The diagram shows an animal cell.

 

Which of the following is/are the function(s) of part K?

• 1 ONLY

• 3 ONLY

• 1 AND 2 ONLY

• 2 AND 3 ONLY

Which of the following is/are the result of osmosis?

1) A plant cell becoming turgid in a dilute solution

2) a red blood cell shrinking in a concentrated solution

3) carbon dioxide leaving the root hair cells

4) water vapour moving through the stomata

• 1 and 2 only

• 2 and 3 only

• 3 and 4 only

• 1, 2 and 4 only

The diagrams show molecules of sucrose and water in solutions placed in dish E and dish F at the start of the experiment.

Which arrows show the correct direction of the net movement of the water and sucrose m

• A

• B

• C

• D

The diagram shows the appearance of a red blood cell after being placed in an unknown solution for 30 minutes.

 

Which of the following correctly describes the content of the unknown solution?

 

• distilled water

• 10% sucrose solution

• 20% salt solution

• 2

The diagram shows the breakdown of three types of organic molecules.

 

Which of the following correctly identifies molecules X, Y and Z?

• A

• B

• C

• D

Benedict’s test was conducted on 4 food samples. The results are shown in the following table.

Which of the following correctly shows the food samples arranged in increasing concentration of reducing sugars?

• A

• B

• C

• D

Maltose is digested by maltase to produce glucose.

Based on the ‘lock-and-key’ hypothesis, which is the ‘lock and which is the ‘key?

• LOCK: Maltase, Key: Glucose

• Lock: Maltose, Key: Glucose

• Lock: Maltase, Key: maltose

• Lock: glucose, Key: maltose

How does chewing food speed up its digestion?

• It kills the bacteria in the food.

• It mixes the food with lipase.

• The temperature of the food is increased.

• The surface area to volume ratio of the food is increased.

A liquid was extracted from a part of the human digestive system.

 

It was found that the liquid could not digest any substances.

 

Which of the following is a likely source of this liquid?

• gall bladder

• mouth

• pancreas

• stomach

Which graph shows the change in pH through the alimentary canal from the mouth to the small intestine?  

• A

• B

• C

• D