Looking for CBSE Sample Paper Class 7 Science Transportation in Animals and Plants Chapter? If Yes here we are ready with CBSE Sample Question Paper Class 7 Science Transportation in Animals and Plants Chapter with Marking Scheme.
CBSE Sample Paper Class 7 Science Transportation in Animals and Plants
Chapter 11
Transportation in animals and plants
Multiple choice questions: (marks:1×4)
1.) ……….carries oxygen rich blood from the heart to all parts of the body.
A.) Arteries
B.) Veins
C.) Hemoglobin
Ans: Arteries.
2.) A resting person has a pulse rate between:
A.) 62-70 bts/min
B.) 72-80 bts/min
C.) 82-90 bts/min
Ans: 72-80 bts/min.
3.) What carries oxygen rich blood from all parts of the body back to the body:
A.) WBC
B.) Arteries
C.) Veins
Ans: Veins.
4.) Assertion (A): William Harvey was called ‘circulator’.
Reason (R ): William Harvey discovered the circulation of blood.
a.) Both A and R are true and R is the correct explanation of A.
b.) Both A and R are true but R is not the correct explanation of A.
c.) A is true but R is false.
d.) R is true but A is false.
Ans: Both A and R are true and R is the correct explanation of A.
Fill in the blanks: (marks:1×5)
1.) The parts involved in excretion form the…………..
Ans: Excretory system.
2.) An adult human being normally passes about………….of urine in 24 hours.
Ans: 1-1.8 L.
3.) Doctor feels a heartbeat through an instrument called…………..
Ans: Stethoscope.
4.) …………….do not possess any circulatory system.
Ans: Hydra.
5.) …………….helps in blood clotting.
Ans: Platelets.
Answer the following questions: (marks:1×10)
1.) By which elements blood is composed?
Ans: Blood is composed of a fluid, called plasma in which different types of cells are suspended.
2.) What is hemoglobin?
Ans: Hemoglobin binds with oxygen and transports it to all the parts of the body and ultimately to all the cells. It will be difficult to provide oxygen efficiently to all the cells of the body without hemoglobin. The presence of hemoglobin makes blood appear red.
3.) Which blood cells fight against germs that enter the body?
Ans: White blood cells (WBC) fight against germs that enter the body.
4.) What are the two types of blood vessels found in the body?
Ans: Arteries and veins are the two types of blood vessels found in the body.
5.) What is a heartbeat?
Ans: The walls of the heart’s chamber are made up of muscles. These muscles contract and dilate rhythmically. This rhythmic contraction and dilation constitutes a heartbeat.
6.) What type of blood cells are found in blood?
Ans: There are mainly three types of blood cells found in blood. They are: Red blood cell (RBC), White blood cell (WBC) and Platelets.
7.) What is called excretion?
Ans: The process of removal of wastes produced in the cells of the living organisms is called excretion.
8.) Write down the composition of urine?
Ans: The urine consists of 95% water, 2.5% urea and 2.5% other waste products.
9.) What is Xylem?
Ans: The vascular tissue for the transport of water and nutrients in the plant is called the xylem.
10.) What is called tissue?
Ans: A tissue is a group of cells that perform specialised function in an organism.
Answer the following questions: (marks:2×3)
1.) What is blood?
Ans: Blood is the fluid which flows in blood vessels. It transports substances like digested food from the small intestine to the other parts of the body. It carries oxygen from the lungs to the cells of the body. It also transports waste for removal from the body.
2.) What is heart?
Ans: The heart is an organ which beats continuously to act as a pump for the transport of blood, which carries other substances with it. The heart is located in the chest cavity with its lower tip slightly tilted towards the left.
3.) Which process is called dialysis?
Ans: Sometimes a person’s kidneys may stop working due to infection or injury. As a result of kidney failure, waste products start accumulating in the blood. Such persons cannot survive unless their blood is filtered periodically through an artificial kidney. This process is called dialysis.
Answer the following questions: (marks:5×2)
1.) Briefly discuss the heart.
Ans: The heart is an organ which beats continuously to act as a pump for the transport of blood, which carries other substances with it.
- The heart is located in the chest cavity with its lower tip slightly tilted towards the left.
- The heart has four chambers. The two upper chambers are called the atria or atrium and the two lower chambers are called the ventricles. The partition between the chambers helps to avoid mixing up blood rich in oxygen with the blood rich in carbon dioxide.
- The walls of the chambers of the heart are made up of muscles. These muscles contract and dilate rhythmically. This rhythmic contraction and dilation constitutes a heartbeat. At rest, a normal healthy person’s heart beats about 72-80 times in a minute.
2.) Briefly discuss the excretory system in humans?
Ans: When body cells perform their functions, certain waste products are released. These are toxic and need to be removed from the body. The process of removal of wastes produced in the cells of the living organisms is called excretion. The parts involved in excretion form the excretory system. The kidneys, ureters, bladder and urethra form the excretory system.
Excretory system in humans:
- The waste which is present in the blood has to be removed from the body. This is done by the blood capillaries in the kidneys.
- When the blood reaches the two kidneys, it contains both useful and harmful substances. The useful substances are absorbed back into the blood. The wastes dissolved in water are removed as urine.
- From the kidneys, the urine goes into the urinary bladder through ureters, which is a tube like structure.
- It is stored in the bladder and is passed out through the urinary opening at the end of a muscular tube called urethra.
- An adult human being normally passes about 1 — 1.8 L of urine in 24 hours. The urine consists of 95% water, 2.5% urea and 2.5% other waste products.
- Sweating is also a form of excretion. The sweat contains water and salts.