The DAV Class 7 Science Solutions and DAV Class 7 Science Chapter 8 Question Answer – Transportation in Plants and Animals are essential study tools for DAV public school students in Class 7.
DAV Class 7 Science Ch 1 Question Answer – Transportation in Plants and Animals
DAV Class 7 Science Ch 8 Solutions – Transportation in Plants and Animals
Something To Know
A. Fill in the blanks.
Question 1.
Water and minerals are transported, to various parts of a plant, by a network of tubes, called the ________
Answers:
Xylem
Question 2.
________ is the respiratory carrier in blood.
Answers:
Haemoglobin
Question 3.
The upper chambers of heart are known as ________ while the lower chambers are called
Answers:
Auricle
Question 4.
________ is the muscular wall that divides the heart length-wise.
Answers:
Ventricle
Question 5.
Excretion, in unicellular plants and animals, takes place through ________
Answers:
Diffusion
B. Write True or False for the following statements.
1. Phloem transports food, from the leaves, to the other parts of the plant.
2. Transpiration is harmful for the plants.
3. Oxygenated blood, from the lungs, flows into the left atrium and then to all other parts of the body.
4. Arteries carry the oxygen-deficient blood, back to the heart.
5. Platelets help in the clotting of blood.
6. The red colour of the blood is due to the presence of plasma.
7. Urine is passed out of the body through the urethra.
Answer:
- Phloem transports food, from the leaves, to the other parts of the plant. (True)
- Transpiration is harmful for the plants. (False)
- Oxygenated blood, from the lungs, flows into the left atrium and then to all other parts of the body. (True)
- Arteries carry the oxygen-deficient blood, back to the heart. (False)
- Platelets help in the clotting of blood. (False)
- The red colour of the blood is due to the presence of plasma. (True)
- Urine is passed out of the body through the urethra. (True)
C. Tick (✓) the correct option.
1. A process, that helps in transportation, in unicellular organisms is
(a) Locomotion
(b) Absorption
(c) Diffusion
(d) Respiration
Answer:
(c) Diffusion
2. In plants, water is transported by the
(a) Stomata
(b) Phloem
(c) Root hair
(d) Xylem
Answer:
(d) Xylem
3. The blood vessels, having thick, elastic walls, are called
(a) Arteries
(b) Veins
(c) Capillaries
(d) Atria
Answer:
(a) Arteries
4. Which part of the blood has haemoglobin?
(a) WBCs
(b) Blood platelets
(c) RBCs
(d) Plasma
Answer:
(c) RBCs
5. Urine gets collected in the
(a) Ureter
(b) Kidney
(c) Urethra
(d) Urinary bladder
Answer:
(d) Urinary bladder
D. Answer the following questions in brief.
Question 1.
What will happen if the xylem tissue gets damaged in a branch of a tree?
Answer:
Since xylem is the channel through which water and minerals are transported to different parts of a plant, damaged xylem in a branch would mean that branch shall not get proper supply of water and minerals. Lack of water and minerals will result in no photosynthesis in leaves of that branch. As a result, that branch shall not be able to get nutrition and would die in the long run.
Question 2.
Define transpiration.
Answer:
Loss of water vapour through stomata and lenticels in plants is called transpiration.
Question 3.
Name the three types of blood vessels.
Answer:
Three types of blood vessels are: arteries, veins and capillaries.
Question 4.
State any two functions of the blood.
Answer:
Two functions of blood are as follows:
(a) Carrying oxygen to different parts of the body,
(b) Carrying nutrients to different parts of the body.
Question 5.
Define the term ‘pulse rate’.
Answer:
The number of pulses per minute is called pulse rate. The throbbing which can be felt near wrist and at some other places of human body is called pulse.
E. Answer the following questions.
Question 1.
Briefly explain the transport of water and minerals in plants.
Answer:
Transportation of water and minerals in plants happens in the following steps:
- Plants obtain water and minerals from soil.
- Roots absorb water and minerals through root hairs.
- The absorbed water and minerals are transported to other parts of plant through xylem.
Question 2.
Describe, in brief, the function of heart.
Answer:
Function of heart:
- Heart pumps the blood.
- When oxygen-deficient blood comes, the heart pumps it to the lungs.
- When oxygen rich blood comes, the heart supplies it to different orga.
Question 3.
State the functions of the three types of blood vessels.
Answer:
| Types of blood vessels | Function |
| Arteries | Carry blood from heart to different orga. |
| Veins | Carry blood from different organs to heart. |
| Capillaries | Supply blood to and remove blood from cells and tissues. |
Question 4.
Give one function each of RBC, WBC and platelets.
Answer:
| Components of blood | Functions |
| RBC | Carry oxygen. |
| WBC | Fight against diseases. |
| Platelets | Carry out blood clotting. |
Question 5.
Draw a neat and well labelled diagram of the Human Excretory System.
Answer:
Value Based Question
Mr. Vidhwan, a very dedicated, disciplined and devoted teacher, decided to spend his post retirement life in his village. He spent his time there in helping the village children to acquire the basic skills of the three R’s. The village elders would often say: “Mr. Vidhwan spends all his time in transporting his knowledge and skills to our children. He is as important to us as the roots are to the plants.”
Question 1.
State the values displayed by Mr. Vidhwan.
Answer:
Caring attitude for children, shares his knowledge
Question 2.
Name the substance and its source which is transported to other parts of the plant by (a) roots (b) leaves.
Answer:
(a) Water comes from soil,
(b) Food is made in leaves.
Question 3.
Try to read the life story’ of any person who ‘transported’ her/his knowledge/ skill/wealth to the ‘society at large’. Share your story with the other students in the class.
Answer:
Do it yourself.
Something To Do
Question 1.
Find out about two human diseases related to the circulatory system. Try to find out their causes and their cure.
Answer:
Two human diseases are given below:
Heart Disease: This happens because of weak heart muscles. The heart is unable to pump blood effectively. Doctors prescribe medicines to manage this problem. In some cases, heart surgery may also be required.
Hypertension: This happens because of cholesterol deposition in arteries. This can lead to heart disease. Doctors prescribe medicine to manage this problem. In some case, surgery may also be required to clear the blockade.
Question 2.
Make an improvised Stethoscope using a plastic funnel, a rubber tube, a balloon and a rubber band. Measure, and compare, the heart beat of all the members of your family using this.
Answer:
Do it yourself.
Question 3.
Have you ever thought of the excretory products of plants and their importance to us? Try to find out the basic details related to these products and give their uses.
Answer:
Resin and lac are examples of excretory products of plants. Resin is used for making some eatables. Lac is used for making bangles and also in dye industry.
DAV Class 7 Science Chapter 1 Solutions – Transportation in Plants and Animals
I. Fill in the blanks.
Question 1.
In plants, water and minerals are transported through ________
Answer:
Xylem.
Question 2.
In plants, food is transported through ________
Answer:
Phloem.
Question 3.
Small pores on the surface of leaf are called ________
Answer:
Stomata
Question 4.
Water vapour is removed from plants during ________
Answer:
Transpiration
Question 5.
In ________ organisms, transportation of substances happens by diffusion.
Answer:
Unicellular
Question 6.
________ blood from different parts of the body reaches the right auricle.
Answer:
Deoxygenated
Question 7.
________ filters waste products from blood.
Answer:
Kidney
Question 8.
Heart beat is the same as ________
Answer:
Pulse rate
Question 9.
Some excretory wastes in the human beings are ________ and ________
Answer:
Urea, Carbon dioxide
II. Tick (✓) the correct option.
1. Which of the following absorb water from soil?
(a) Root hairs
(b) Xylem
(c) Phloem
(d) Lenticels
Answer:
(a) Root hairs
2. In leaves, transpiration happens through which of these?
(a) Xylem
(b) Phloem
(c) Stomata
(d) Lenticels
Answer:
(c) Stomata
3. How many chambers are there in the human heart?
(a) One
(b) Two
(c) Three
(d) Four
Answer:
(d) Four
4. Where does oxygenation of blood take place in human body?
(a) Heart
(b) Lungs
(c) Kidneys
(d) Skin
Answer:
(b) Lungs
5. Urine is collected in which part of the urinaiy system?
(a) Kidneys
(b) Ureter
(c) Urinaiy bladder
(d) Urethra
Answer:
(c) Urinary bladder
6. Transpiration involves
(a) Absorption of water
(b) Loss of water vapour
(c) Absorption of minerals
(d) Loss of minerals
Answer:
(b) Loss of water vapour
7. Root hairs
(a) Increase absorption of water
(b) Decrease absorption of water
(c) Increase transpiration
(d) Do not affect absorption of water
Answer:
(a) increase absorption of water
8. Which of the following are not organs of excretion
(a) Kidneys
(b) Stomach
(c) Lungs
(d) Skin
Answer:
(b) Stomach
III. State whether the following statements are true or false.
1. Xylem transports food.
2. Transpiration is harmful for plants.
3. Phloem is a conducting tissue.
4. Human heart consists of four chapibers.
5. Arteries, veins and capillaries are the various types of blood vessels.
Answers:
1. Xylem transports food. (False)
2. Transpiration is harmful for plants. (False)
3. Phloem is a conducting tissue. (True)
4. Human heart consists of four chapibers. (True)
5. Arteries, veins and capillaries are the various types of blood vessels. (True)
IV. Answer the following questions in brief.
Question 1.
Why is transpiration known as a necessary evil?
Answer:
Transpiration is necessary for facilitating transport of water and minerals in plants. Additionally, transpiration plays an important role in photosynthesis. But transpiration leads to the loss of a great amount of water. To compensate this, plants need lot of water; which can be dangerous for plants which grow in water deficient areas. Hence, transpiration is known as a necessary evil.
Question 2.
Why is blood red in colour?
Answer:
Blood contains a red pigment; called haemoglobin. The colour of blood is red due to this pigment.
Question 3.
What will happen if there are no platelets in blood?
Answer:
Platelets carry out blood coagulation. If there are no platelets in blood, then blood clotting will not happen. This can prove dangerous in case of an injury; as excessive blood loss can even result in death.
Question 4.
What is the function of heart?
Answer:
Heart pumps blood to different parts of the body.
Question 5.
What is the function of haemoglobin in respiration?
Answer:
Haemoglobin carries oxygen and thus it is the main respiratory carrier.
Question 6.
What is ECG? What information does it give about a person?
Answer:
ECG stands for Electro Cardio Graph. It is a graph printed on a thin strip of paper. ECG gives valuable information about functioning of the heart. Doctors use this information to diagnose various diseases related to the circulatory system.
V. Answer the following questions.
Question 1.
Explain transportation of water and minerals in plants.
Answer:
Transportation of water and minerals:
- Plants obtain water and minerals from soil.
- Roots absorb water and minerals through root hairs. A larger number of root hairs increase the area for absorption of water and minerals.
- The absorbed water and minerals are transported to other plant parts through xylem. Xylem is a network of very fine tubes.
Question 2.
Explain transportation of food in plants.
Answer:
In plants, food is usually prepared in leaves. From leaves, food is transported to different parts of the plant through phloem. Phloem is also a network of very fine tubes. From storage organs also, food is transported to different plant parts.
Question 3.
What do you understand by transpiration? Explain.
Answer:
Loss of water molecules in the form of vapour from plant is called transpiration. Transpiration takes place through minute pores. The pores on leaves are called stomata. The pores on stem are called lenticels. Transpiration plays a major role in transport of water and minerals. Transpiration also plays a major role in photosynthesis.
Question 4.
Write a brief note on the human heart.
Answer:
The heart is a hollow muscular organ. It lies slightly left from the middle in the chest. The heart pumps blood to different parts of the body. There are four chambers in the heart, viz. right auricle, right ventricle, left auricle and left ventricle. When the heart muscles of a particular chamber contract, it pushes the blood.
Question 5.
Explain different types of blood vessels,
Answer:
Blood vessels are of three types, viz. arteries, veins and capillaries.
(a) Arteries: Arteries carry oxygenated blood. Arteries have thick walls, because they have to carry blood under high pressure.
(b) Veins: Veins carry deoxygenated blood. Veins have thin walls, because they don’t have to carry blood under high pressure.
(c) Capillaries: Capillaries branch out from arteries and meet in veins. Capillaries supply blood to the tissue level and cellular level.
Question 6.
Which are the main components of blood?
Answer:
Blood has lorlowing main components:
(a) Plasma
(b) Platelets
(c) Blood cells
VI. Match the following:
| Column A | Column B |
| 1. Phloem | (a) Sweat |
| 2. Skin | (h) Transport of water |
| 3. Transpiration | (c) Pulse rate |
| 4. Xylem | (d) Transport of food |
| 5. Heart beat | (e) Loss of water vapour from leaves |
VII. Differentiate between:
Question 1.
Xylem and phloem
Answer:
Xylem transports water and minerals in plants, while phloem transports food.
Question 2.
Arteries and veins
Answer:
| Arteries | Veins |
| Arteries carry oxygenated blood. | Veins carry deoxygenated blood. |
| Arteries are made up of thick wall. | Veins are made up of thin walls. |
| Arteries carry blood under high pressure. | Veins carry blood under no pressure. |
Question 3.
Transportation and transpiration
Answer:
Movement of materials in living beings is called transportation, while loss of water molecules in the form of vapour is called transpiration.
Question 4.
Red blood cells and white blood cells
Answer:
Red Blood Cells are red in colour, while White Blood Cells are pale white in colour. Red Blood Cells carry oxygen, while White Blood Cells destroy harmful substances and infection agents.
VIII. Projects
Question 1.
With the help of a flow chart, show the flow of blood in human circulatory system.
Answer:
Do it yourself.
Question 2.
Ask your teacher to explain about haemodialysis.
Answer:
Do it yourself.
Question 3.
Try to find out some information about blood groups and their importance. Make a list of blood groups of 10 classmates of yours.
Answer:
There are four types of blood groups, viz. A, B, AB and O. The knowledge about blood groups is necessary for carrying out blood transfusion and organ transplant.
Question 4.
Measure and compare the heart beat/pulse rate of all the members of your family.
Answer:
Do it yourself.