Free Transportation in Animals and Plants 02 Practice Test - 7th grade
Question 1
Red blood cells help in transporting oxygen to all parts of the human body.
SOLUTION
Solution : A
Red blood cells contain a pigment called haemoglobin, which is responsible for the red colour of the blood. Haemoglobin can bind with oxygen and carbon dioxide and transport them across the body. Haemoglobin carries oxygen from the lungs to all parts of the body and carbon dioxide from all parts of the body to the lungs.
Question 2
Transpiration is important for plants because:
I: It removes extra water
II: It cools down the plant
III: It helps in transport of food
IV: It helps in transport of water upwards
II, III and IV
I, II and III
I, II and IV
II and III
SOLUTION
Solution : C
Transpiration is defined as the process where plants expel excess water as water vapor through pores in their leaves called stomata. This process removes excess water, creates a suction pull to help in the transport of water upwards and cools down the plant. The phloem tissues help in the transport of food.
Question 3
The aorta is the largest artery in the body.
True
False
SOLUTION
Solution : A
The aorta is the largest artery in our body. It conveys oxygenated blood from the heart to the smaller arteries which takes it to all other parts of the body.
Question 4
Which among the following are the functions of sweat?
It removes wastes
It cools the body
Reduces fat tissues
Protects the body
SOLUTION
Solution : A and B
Sweat is composed of mainly water, excess salts and urea, which need to be removed from the body as waste. Its main function is to control body temperature. As the water in the sweat evaporates, the surface of the skin cools. Thus sweat removes waste from the body and cools it down as well.
Question 5
The _____ join up to form veins which empty carbon dioxide rich blood into the heart
SOLUTION
Solution : D
Arteries transport oxygenated blood to all parts of the body form the heart. On reaching the tissues, arteries divide into capillaries. After delivering oxygen, now the capillaries join to form veins. The veins carry the carbon dioxide rich blood to the heart.
Question 6
In which body cavity is the heart located?
SOLUTION
Solution : C
The heart is located in the chest cavity, also called thoracic cavity. It is protected by the rib cage. Chest cavity also houses the lungs.
Question 7
Which of the following organisms does not possess a circulatory system?
SOLUTION
Solution : A and B
Animals such as hydra and sponges do not posses a circulatory system. The water in which they live, brings in food and oxygen as they enter their bodies. When this water moves out of the body, it carries away waste materials and carbon dioxide away from the body.
Question 8
Which of the following organism excretes ammonia?
SOLUTION
Solution : D
All the nitrogenous wastes in the fishes are converted into ammonia before it is excreted out into the water. This ammonia directly dissloves in the water. Birds and lizards excrete nitrogenous wastes as uric acid. The excretory product in humans is urea.
Question 9
Which of the following are components of blood?
SOLUTION
Solution : A, B, and C
The fluid part of the blood is called the serum. The other cellular components present in the blood are red blood cells, white blood cells and platelets. Bile is secreted by the liver and stored in the gallbaldder.
Question 10
Which of the following is a component of plasma?
SOLUTION
Solution : D
Plasma is the fluid component of the blood. It is derived when all the blood cells - red blood cells, white blood cells and platelets are separated from whole blood. The remaining straw-coloured fluid is 90–92 percent water and dissolved nutrients, proteins, waste products and hormones.