Chapter 6 test

Which of the following best describes a heterotroph?

• It is able to synthesize organic molecules from inorganic substances.

• It obtains nutrients from living organisms only.

• It lives on dead organic matter.

• It obtains organic nutrients from the environment.

The table shows the nutritional compositions of four foods.

Which food can provide the most energy per gram?

• P

• Q

• R

• S

Excess glucose will be stored in the human body as

(1) glycogen.

(2) starch.

(3) fat.

• (1) and (2) only

• (2) and (3) only

• (1) and (3) only

• (1), (2) and (3)

It is suggested that when babies get older, they should not be fed with milk only. Babies fed only with milk for a long period of time may develop anaemia because

• milk contains a lot of lactose.

• milk is rich in proteins.

• milk does not contain any roughage.

• milk has a low content of iron.

A student carried out various tests on a food sample.

The table shows the results.

The food sample contains

• sucrose.

• starch.

• glucose.

• lipids.

Which of the following is most likely the food product bearing this nutrition label?

• Wheat bread

• Tofu

• Coke

• Sausages

If a teenager eats this food product only for a month, which of the following conditions may appear?

• Diarrhoea

• Constipation

• Anaemia

• Rickets

The graph shows the changes in the mass of three chemical substances in the human body during a month of starvation.

What do P, Q and R represent respectively?

• P: proteins Q: lipids R: glycogen

• P: glycogen Q: lipids R: proteins

• P: lipids Q: proteins R: glycogen

• P: proteins Q: glycogen R: lipids

The graph shows the percentage of carbohydrates, proteins, lipids and water in three foods, X, Y and Z.

Which of the following most likely identifies foods X, Y and Z?

• X: rice Y: peanut Z: milk

• X: milk Y: peanut Z: rice

• X: milk Y: rice Z: peanut

• X: rice Y: milk Z: peanut

The graph shows the percentage of carbohydrates, proteins, lipids and water in three foods, X, Y and Z.

Which of the following correctly arranges the energy content of per unit mass of foods X, Y and Z?

• X > Y > Z

• X > Z > Y

• Z > X > Y

• Z > Y > X