NEW
Font size
WorksheetsUnit 7 - Online Quiz #1
Total questions: 17
Worksheet time: 9mins
Which of the following comparisons between oxygen and carbon dioxide is correct?
A
B
C
D
A gas is usually used to fill food packages to prevent the food from going bad. What gas is it?
Oxygen
Carbon dioxide
Nitrogen
Noble gases
Green plants are important to all animals on Earth. Which of the following statements about green plants is INCORRECT?
They absorb sunlight to keep the Earth warm.
They make their own food and provide energy for animals.
They undergo photosynthesis to change light energy to chemical energy stored as food.
They take in carbon dioxide and release oxygen under sunlight, so that the amount of carbon dioxide and oxygen in nature are balanced.
Which of the following is/are the direct product(s) of photosynthesis?
water
Oxygen
starch and oxygen
water, starch and oxygen
A student carries out an investigation with the set-up below. The inverted test tube was completely filled with water at the beginning of the investigation as shown in Figure P. After several hours, the water level falls as shown in Figure Q. Gas W is collected. What is gas W?
Carbon dioxide
Oxygen
Water vapour
Air
Which of the following is INCORRECT about testing starch in green leaves?
A
B
C
D
Why do we need to destarch the plants before investigating necessary factors for photosynthesis?
To make the results of iodine test more obvious.
To remove food stored in plants and force them to carry out photosynthesis.
To ensure that the plants have starch at the beginning of the investigation.
To ensure any starch detected later is formed during the investigation.
The following diagram shows a destarched plant. Four leaves of the plant are enclosed with conical flasks containing different chemicals. Two of the conical flasks are also wrapped with black plastic bags. The plant is then put under sunlight for several hours. Which leaf/leaves of the plant will show brown colour in an iodine test?
Leaf W only
Leaves W and Y only
Leaves X and Z only
Leaves X, Y and Z only
Which of the following shows a correct direction of flow of energy?
Grass, Rabbit, Hawk, Snake
Grass, Snake, Rabbit, Hawk
Grass, Rabbit, Wild dog, Lion
Water plant, Small fish, Shrimp, Human
Which of the following statements about respiration and burning is correct?
Both of them require a high temperature to take place.
Both of them require oxygen to take place.
Energy is only given out in respiration but not in burning.
Energy is given out in a gradual and controlled manner in both processes
Which of the following is INCORRECT about stoma in daytime?
Stoma will open to allow carbon dioxide gets in.
Stoma will open to allow oxygen gets out.
Stoma will close to prevent water loss.
The guard cells surrounding the stoma will be full of water.
Which of the following gases is the most abundant in exhaled air?
Oxygen
Carbon dioxide
Nitrogen
Helium
The percentage of oxygen in exhaled air is about
0.03%.
4%.
16%.
21%.
Which of the following is NOT part of the human breathing system?
Mouth
Rib
Intercostal muscle
Diaphragm
Inside the lungs, which of the following will pass from the air sacs into the blood capillaries?
(1) Water
(2) Carbon dioxide
(3) Oxygen
(1) only
(3) only
(1) and (2) only
(2) and (3) only
Which of following is the function of mucus produced by mucus-producing cells?
It traps dust particles and bacteria entering the breathing system.
It sweeps out dust particles and bacteria entering the breathing system.
It causes the cilia to stick together.
It makes air easier to pass into and out of the lungs.
Which of the following are the harmful effects on health of carbon monoxide?
(1) Decrease blood oxygen concentration
(2) Causes addiction
(3) Lead to heart diseases in the long term
(1) and (2) only
(1) and (3) only
(2) and (3) only
(1), (2) and (3)
