Free Transportation in Animals and Plants 01 Practice Test - 7th grade 

Question 1

Which of the following is/are functions of the stomata present in the leaf?

A.

Absorbing carbon dioxide from the atmosphere

B.

Giving out oxygen into the atmosphere 

C.

Transpiration of excess water

D.

Control of sunlight entering in the leaves

SOLUTION

Solution : A, B, and C

A plant takes in carbon dioxide essential for photosynthesis through the stomata. Stomata expels out the oxygen produced during photosynthesis. They also release water that is absorbed by the roots in the form of water vapour. And this process is called transpiration. The sunlight is absorbed by the chlorophyll that is present in the leaf.  

Question 2

Blood flowing through arteries and veins have the same amount of dissolved oxygen.

A.

True

B.

False

SOLUTION

Solution : B

Arteries carry blood rich in oxygen, except the pulomonary artery which carries deoxygenated blood. Veins carry blood rich in carbon dioxide, except pulmonary veins which carry oxygenated blood. Hence the statement is incorrect.

Question 3

If our blood was made up of only the cells that fights pathogens, then what would it's colour be?

A. Red
B. Colourless
C. Yellow
D. White

SOLUTION

Solution : C

  • Blood is mainly composed of two components- plasma and blood cells.
  • Plasma is yellow coloured fluid part of the blood. 
  • Blood cells are of three types- RBCs, WBCs and platelets.
  • RBCs are red in colour due to haemoglobin and functions in transport of gases.
  • White blood cells and platelets are colourless. WBCs are involved in defense mechanism, while platelets participate in blood clotting.
  • So, if we have only white blood cells in our body then the colour of the blood will be yellow due to colour of the plasma, since WBCs and platelets are colourless. 

Question 4

What will happen if there is a decrease in platelet count in the blood?

A.

Blood will not clot

B.

Blood will clot very quickly

C.

We will become more immune

D. We will become more susceptible to germs 

SOLUTION

Solution : A

The platelets form a meshwork and release blood clotting chemicals at the site of injury and prevent further bleeding. If there is a decrease in platelet count in the blood, then the blood will not be able to clot.

Question 5

The organ(s) responsible for filtering nitrogenous wastes and excess fluid from the blood is/are  _______ .

A.

kidneys

B. lungs
C. heart
D. stomach

SOLUTION

Solution : A

Kidneys are a pair of organs present behind the abdominal cavity in either side of the backbone in humans. It is the major excretory organ in the human body. Its main function is to filter waste and excess fluid from the blood and production of urine. 

Question 6

Arteries are ______ than veins.

A.

thinner

B.

thicker

C.

longer

D.

shorter

SOLUTION

Solution : B

Arteries are large blood vessels that carry blood from the heart to all parts of the body. For the blood to reach all parts of the body, heart pumps blood at a high pressure into the arteries. Veins, on the other hand carry deoxygenated blood from various body parts to the heart. In veins, the blood flows slowly. Hence, arteries have to be thicker than veins to withstand such high pressure.

Question 7

Which of the following is/are functions of the heart?

A. Pumping oxygen rich blood to different areas of the body.
B. Pumping carbon dioxide rich blood to the liver.
C. Pumping carbon dioxide rich blood to the lungs.
D. Pumping carbon dioxide rich blood to the kidneys.

SOLUTION

Solution : A and C

  • Heart pumps the oxygenated blood to all parts of the body, while the deoxygenated blood is brought back to the heart.
  • This deoxygenated blood is now pumped from the heart to the lungs to get oxygenated again.
  • The oxygen rich blood is then brought back to the heart from the lungs. Blood then enters the left atrium and then passes to the left ventricle.
  • The blood from the left ventricle is pumped into another blood vessel, called aorta. The aorta pumps this oxygenated blood to all parts of the body.
Image result for heart double circulation

Question 8

The two upper chambers of the heart are called ______ .

A. ventricles 
B. atria 
C. arteries
D. veins

SOLUTION

Solution : B

  ∙ Human heart consists of 4 chambers. The two upper chambers of the heart are called atria and the two lower chambers are called ventricles.
  ∙ Arteries are the blood vessels that carry oxygenated blood from the heart to all parts of the body.
  ∙ Veins are the blood vessels that carry deoxygenated blood back to the heart from all parts of the body. 

Question 9

Who discovered the path of circulation of blood in the human body? 

A. Robert Hooke
B. William Harvey 
C. Louis Pasteur 
D. Theodore Schwann

SOLUTION

Solution : B

William Harvey was the first person to describe the circulation of blood in the body. He showed that arteries and veins form a complete circuit. The circuit starts at the heart and leads back to the heart. The heart's regular contractions drive the flow of blood throughout the whole body.

Question 10

Which of the following are parts of the excretory system? 

A. Large intestine 
B. Small intestine 
C. Urinary bladder
D. Kidneys 

SOLUTION

Solution : C and D

Kidneys, ureters, urinary bladder and the urethra are the parts of the excretory system. The small and the large intestine are parts of the digestive system. 
Related Exams