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Published on: 02/08/2018
From the chapter Transpiration in Animals and Plants, some of the important questions are covered in this question paper.
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Questions + Answers key
Take MCQ Science Test
1.
Heart has four _________ called as chambers.
2.
The parts or organs involved in excretion to form the _________.
3.
Heart is located in the ___________.
4.
The _________ is an organ which beats continuously to act as a __________.
5.
Water reaches great heights in the trees because of suction pull caused by __________.
6.
Urine is called an excretory product. Why?
7.
Exchange of gases, food and other substances occurs between arteries and veins. How does this exchange happen?
8.
Pulse rate can indicate the health states of an individual. How?
9.
Human blood group is divided into how many groups? Name them.
10.
Veins have valves which allow blood to flow only in one direction. Arteries do not have valves. Yet the blood flows in one direction only. Can you explain why?
11.
How does the water move from root to leaves?
12.
Make a table depicting the function of all chambers of the human heart.
13.
Give one function of each of the following organs.
(a) Blood vessels
(b) Kidney
(c) Blood platelets
(d) Heart.
14.
What is the relation between the rate of heartbeat and pulse rate? If a pulse rate of an athlete is 96/min, what will be the number of his heartbeat at the same time?
15.
While riding a bike, Mason fell from it due to loss of balance. He got up and realised that he was bleeding from several wounds badly. He panicked and started to run but Mansi who was looking at him, stopped him and told him to clean his wound with a clean cloth and that blood will stop coming in a while. Mason noticed that he has stopped bleeding after sometime and a hard covering was appearing on his wounds.
(a) Why did the bleeding stop after a while?
(b) What is blood and what type of cells are responsible for clotting?
(c) What of values do you think Mansi have?
16.
Priya's grandfather was taken to the hospital as he was unable to perform excretory processes. Priya heard a nurse talking to her father that her grandfathers has kidney failure and needs to undergo dialysis. Priya later asked her father as to what is dialysis process and why does grandpa needs it. Her father smiles and tells her all the facts associated with this process.
(a) What do you mean by dialysis?
(b) Why is there a need for dialysis in some people?
(c) Excretion is an important life process. How?
(d) Which is the major excretory organ in humans?
(e) What values do you observe in Priya?
17.
Transport of water in plants takes place through
xylem
vascular bundle
phloem
None of these
18.
In a tall tree which force is responsible for pulling water and minerals from the soil?
Gravitational force
Transportation force
Suction force
Conduction force
19.
The filtration of blood is done by
heart
kidney
blood
urethra
20.
Aquatic animals like fish excrete their wastes in gaseous form as
oxygen
hydrogen
ammonia
nitrogen
21.
The lower chambers of heart is called
atria
ventricles
aorta
vena cava
22.
In which of the following parts of human body are sweat glands absent?
Scalp
Armpits
Lips
Palms
23.
A certain type of cells helps in destruction of disease-causing microorganisms are known as
thrombocytes
white blood cells
osteocytes
red blood cells
24.
They are pipe-like consisting of a group of specialised cells. They transport substances and form a two-way traffic in plants. Which of the following terms qualifies for the features mentioned above?
Xylem tissue
Vascular tissue
Root hairs
Phloem tissue
25.
Which among the following contain haemoglobin?
Red blood cells
White blood cells
Both (a) and (b)
None of these
26.
The muscular tube through which stored urine is passed out of the body is called
kidney
ureter
urethra
urinary bladder
1.
( )
compartments
2.
( )
excretory system
3.
( )
chest cavity
4.
( )
heart, pump
5.
( )
transpiration
6.
Urine is the mixture of urea and other unwanted salts with water which is needed to be excreted out as its presence in blood can make a person ill.
7.
Exchange of substances between arteries and veins occurs via capillaries.
8.
Pulse rate will increase or decrease from normal rate if a person is not well.
9.
Human blood group is divided into four groups. These are A, B, AB and O.
10.
Veins have valves to prevent blood from flowing backwards and pooling, whereas arteries pump blood at very high pressures, which naturally prevents backflow.
11.
The water moves from root to leaves with the help of specialised cells called vascular tissue. Transport of water and nutrients is done by xylem tissue present in plants.
12.
The human heart is divided into four chambers, i.e. upper two atrium and lower two ventricles. The functions of these chambers can be tabulated as follows
| Chamber | Function |
| Left atrium | Receives oxygenated blood from lungs through pulmonary veins and pours it into left ventricle. |
| Right atrium | Receives deoxygenated blood from various body parts through superior and inferior vena cava and pours it into right ventricle. |
| Left ventricle | Pumps oxygenated blood to various parts of body through aorta. |
| Right ventricle | Pumps deoxygenated blood into lungs through pulmonary artery |
13.
The main function of the following organs are as follows:
(a) Blood vessels These run between the heart and the rest of the body. It helps in the transport of blood between heart and various organs of the body.
(b) Kidney It is called as the 'magic filters'. It helps in the removal of unwanted substances like urea from the blood.
(c) Blood platelets This component of blood helps in blood clotting and prevents the blood loss from the body.
(d) Heart It is a pumping organ which receives blood from the body through veins and pumps it with enough force into the arteries from where it is carried to the various body parts.
14.
The rhythmic contraction and relaxation of the muscles of the heart is called heartbeat.
Whereas, the rhythmical throbbing of the arteries as the blood is pushed forward through them is called pulse. It can be felt in the wrist, temples, etc. Pulse rate is the number of heartbeats per minutes.
The number of heart beat is equal to the number of pulse per minute.
Therefore, if a pulse rate of an athlete is 96/min then the number of his heartbeat at the same time will also be 96/min.
15.
(a) Bleeding stops after some time because some specialised cells start forming a hard covering called clot at the site of wound.
(b) Bleeding is a fluid connective tissue present in all parts of the body. Platelets are responsible for formation of clot.
(c) Mansi is helpful, knowledgeable and interested in science subject.
16.
(a) Dialysis is the process used for cleaning of the blood by separating the waste products in an artificial medium.
(b) Dialysis is needed when the excretory organ of humans, i.e. kidney becomes damaged on unfunctional due to some injury or infection.
(c) Excretion process removes the waste products released in body after the utilisation of food and other components. These products are toxic and may harm us if not removed from our body.
(d) Kidney
(e) Priya is curious, sincere and aware eager to acquire new knowledge.
17.
(a)
xylem
18.
(c)
Suction force
19.
(b)
kidney
20.
(c)
ammonia
21.
(b)
ventricles
22.
(c)
Lips
23.
(b)
white blood cells
24.
(d)
Phloem tissue
25.
(a)
Red blood cells
26.
(c)
urethra
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CBSE 7th Standard CBSE Subjects
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