NCERT Solutions for Class 7 Science Chapter 11 Transportation In Animals And Plants are provided here with simple step-by-step explanations. These solutions for Transportation In Animals And Plants are extremely popular among Class 7 students for Science Transportation In Animals And Plants Solutions come handy for quickly completing your homework and preparing for exams. All questions and answers from the NCERT Book of Class 7 Science Chapter 11 are provided here for you for free. You will also love the ad-free experience on Meritnation’s NCERT Solutions. All NCERT Solutions for class Class 7 Science are prepared by experts and are 100% accurate.
Page No 57:
Question 1:
The muscular tube through which stored urine is passed out of the body is called –
(a) kidney
(b) ureter
(c) urethra
(d) urinary bladder
Answer:
Urine is stored in the urinary bladder and is passed out of the body through a muscular tube called the urethra.
Hence, the correct answer is option (c).
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Question 2:
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 qualify for the features mentioned above?
(a) Xylem tissue
(b) Vascular tissue
(c) Root hairs
(d) Phloem tissue
Answer:
Phloem tissue is made of specialised cells that form two-way traffic in plants. Phloem is a vascular tissue that helps in the transportation of food to different parts of the plant.
Hence, the correct answer is option (d).
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Question 3:
The absorption of nutrients and exchange of respiratory gases between blood and tissues takes place in –
(a) veins
(b) arteries
(c) heart
(d) capillaries
Answer:
The absorption of nutrients and exchange of respiratory gases between blood and tissue takes place in the capillaries. Capillaries are extremely thin tubes that join to form veins that empty into the heart. In the lungs, capillaries absorb oxygen from the inhaled air in the bloodstream and during exhalation, releases carbon dioxide.
Hence, the correct answer is option (d).
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Question 4:
In which of the following parts of human body are sweat glands absent?
(a) Scalp
(b) Armpits
(c) Lips
(d) Palms
Answer:
Sweat glands absent in lips this is the reason that sweat is not observed on lips.
Hence, the correct answer is option (c).
Page No 58:
Question 5:
In a tall tree, which force is responsible for pulling water and minerals from the soil?
(a) Gravitational force
(b) Transportation force
(c) Suction force
(d) Conduction force
Answer:
The suction force is responsible for pulling water and minerals from the soil in a tall tree. Water and minerals are absorbed by the roots from the soil and evaporation of water from the leaves generate a suction force that is responsible for the upward movement of water.
Hence, the correct answer is option (c).
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Question 6:
Aquatic animals like fish excrete their wastes in gaseous form as
(a) Oxygen
(b) Hydrogen
(c) Ammonia
(d) Nitrogen
Answer:
Aquatic animals like fish excrete their wastes in gaseous form as ammonia. It dissolves in water and such organisms are called ammonotelic animals.
Hence, the correct answer is option (c).
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Question 7:
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?
Answer:
Arteries carry oxygen-rich blood to all parts of the body. Due to the presence of the elastic wall, the blood flow in arteries is rapid and at high pressure.
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Question 8:
What is the special feature present in a human heart which does not allow mixing of blood when oxygen-rich and carbon dioxide-rich blood reach the heart?
Answer:
The human heart has a four-chamber as the two upper chambers are called atria and the two lower chambers are called ventricles. The partition is present between the chambers helps to avoid mixing up of oxygen-rich blood with carbon dioxide rich blood.
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Question 9:
Name the organ which is located in the chest cavity with its lower tip slightly tilted towards the left.
Answer:
The heart is located in the chest cavity with its lower tip slightly tilted towards the left.
Page No 58:
Question 10:
Look in the given figure. Draw another figure of the same set-up as would be observed after a few hours.
Answer:
Image
After few hours, it was observed that the level of sugar solution increases in potatoes and the water level decreases in the container. It indicates that water present in the container is absorbed by the sugar solution and it occurs by the process of osmosis.
Page No 59:
Question 11:
Arrange the following statements in the correct order in which they occur during the formation and removal of urine in human beings.
(a) Ureters carry urine to the urinary bladder.
(b) Wastes dissolved in water is filtered out as urine in the kidneys.
(c) Urine stored in urinary bladder is passed out through the urinary opening at the end of the urethra.
(d) Blood containing useful and harmful substances reaches the kidneys for filtration.
(e) Useful substances are absorbed back into the blood.
Answer:
(d) Blood containing useful and harmful substances that reaches the kidney for filtration.
(e) Useful substances are absorbed back into the blood.
(b) Wastes dissolved in water is filtered out as urine in the kidneys.
(a) Ureters carry urine to the urinary bladder.
(c) Urine stored in urinary bladder is passed out through the urinary opening at the end of the urethra.
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Question 12:
Paheli uprooted a rose plant from the soil. Most of the root tips, with root hairs got left behind in the soil. She planted it in a pot with new soil and watered it regularly. Will the plant grow or die? Give reason for your answer.
Answer:
Two possible conditions arise:
(i) The plant will die due to the absence of root hairs as root hairs absorb water and minerals from the soil. The rose plant will die when it is transferred into the new soil.
(ii) The plant will survive as the stem of the rose plant may grow into the new plants and forms new root hairs.
Page No 59:
Question 13:
(a) Name the only artery that carries carbon dioxide-rich blood.
(b) Why is it called an artery if it does not carry oxygen-rich blood?
Answer:
(a) Pulmonary artery carries only carbon dioxide-rich blood.
(b) Arteries carries blood away from the heart. The pulmonary artery also carries carbon dioxide-rich blood away from the heart.
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Question 14:
Boojho’s uncle was hospitalised and put on dialysis after a severe infection in both of his kidneys.
(a) What is dialysis?
(b) When does it become necessary to take such a treatment?
Answer:
(a) Dialysis is a process of periodic filtration of blood through artificial kidneys.
(b) Dialysis is a method necessary to take when waste products start accumulating in the blood due to kidney failure.
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Question 15:
Name the process and the organ which helps in removing the following wastes from the body.
(a) Carbon dioxide
(b) Undigested food
(c) Urine
(d) Sweat
Answer:
(a) Lungs. Lungs remove carbon dioxide from the body by the process called exhalation.
(b) Large intestine. The undigested food is removed by the large intestine.
(c) Kidney. Urine is removed by the kidney by the process of excretion.
(d) Skin. Sweat is removed by the skin as it contains sweat glands.
Page No 60:
Question 16:
Observe in the given figure and answer the given questions:
(a) Name the instrument.
(b) Label the parts A, B and C.
Answer:
Image
The given figure represents a stethoscope. This device is used by the doctor to amplify the heart sound.
Parts of the stethoscope:
A- Chest piece. It detects the sound from the chest.
B- Tube. It transmits sound to the earpiece.
C-Ear piece. It helps in hearing the sound from the chest.
Page No 60:
Question 17:
Paheli noticed water being pulled up by a motor-pump to an overhead tank of a five-storeyed building. She wondered how water moves up to great heights in the tall trees standing next to the building. Can you tell why?
Answer:
The water evaporates through the stomata present on the surface of the leaves in the form of water vapour by the process of transpiration. It generates a suction pull that can pull water at a greater height in the tall trees.
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Question 18:
Match the parts of the heart in Column I with the direction of flow of blood in Column II.
Column I Column II
(i) Right ventricle (a) Pushes blood into the pulmonary artery.
(ii) Pulmonary veins (b) Take deoxygenated blood from the heart to lungs.
(iii) Left atrium (c) Receives blood from different parts of the body.
(iv) Pulmonary arteries (d) Bring oxygenated blood from lungs to the heart.
(v) Left ventricle (e) Pushes blood into the aorta.
(vi) Right auricle (f) Receives oxygenated blood from the pulmonary veins.
Answer:
(i)-(a), the right ventricle receives carbon dioxide-rich blood from the right atrium and sends it to the lungs through the pulmonary artery.
(ii)-(d), the Pulmonary vein brings oxygen-rich blood from the lungs to the left atrium.
(iii)- (f), the left atrium receives oxygenated blood from the pulmonary vein.
(iv)- (b), the pulmonary arteries carry carbon-dioxide rich blood from the heart to the lungs.
(v)-(e), the left ventricle pumps blood to different parts of the body through the aorta.
(vi)-(c), the right auricle receives blood from different parts of the body.
Page No 61:
Question 19:
Read the following terms given below.
root hairs xylem urethra
arteries kidneys veins
atria capillaries heart
ureter phloem urinary bladder
Group the terms on the basis of the categories given below.
(a) Circulatory system of animals.
(b) Excretory system in human.
(c) Transport of substances in plants.
Answer:
(a) Heart, atria, capillaries, veins, arteries are circulatory systems in humans.
(b) Kidneys, urethra, ureter, urinary bladder are excretory systems in humans.
(c) Xylem, phloem, root hairs are the transport substances in plants.
Page No 61:
Question 20:
Fill in the blanks of the following paragraph using just two words – arteries and veins.
___(a)___ carry oxygen-rich blood from the heart to all parts of the body and ___ (b)___ carry carbon dioxide-rich blood from all parts of the body back to the heart. ___ (c)___ have thin walls and __ (d)___ have thick elastic walls. Blood flows at high pressure in ___ (e)____. Valves are present in __ (f) ___ which allow blood to flow only towards the heart. __ (g)___ divide into smaller vessels. These vessels further divide into extremely thin tubes called capillaries. The capillaries join up to form ____ (h)_____.
Answer:
(a) Arteries
(b) veins
(c) Veins
(d) arteries
(e) arteries
(f) veins
(g) Arteries
(h) vein
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Question 21:
While learning to ride a bicycle Boojho lost his balance and fell. He got bruises on his knees and it started bleeding. However, the bleeding stopped after some time.
(a) Why did the bleeding stop?
(b) What would be the colour of the wounded area and why?
(c) Which type of blood cells are responsible for clotting of blood?
Answer:
(a) The bleeding stopped because of the formation of dark red blood clots that had plugged the cut.
(b) The colour of the wounded area is dark red because of blood clotting.
(c) Blood clot is formed because of the formation of another type of blood cells called platelets.
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