Class 7 Unit NO . 2 Transportation in Human and plants (PTB)
2. What do you mean by oxygenated blood?
Ans: The blood rich with oxygen is called oxygenated blood.
3. What is the estimated size of our heart?
Ans: Our heart is a muscular organ that pumps blood continuously. The size of our heart is about the size of our fist.
4. Which arteries carry deoxygenated blood from the heart to the lungs?
Ans: Pulmonary arteries carry deoxygenated blood from the heart to the lungs.
5. Write the names of at least two diseases that can damage our kidneys.
Ans. Blood pressure and diabetes are diseases that can damage our kidneys.
6. Which tissue does transport water in plants?
Ans: Xylem tissue does transport water from roots to leaves in plants.
7. Name three parts of the circulatory system.
Ans: 1. Heart 2. Blood 3. Blood Vessels
8. Can you explain why it is important to circulate blood through the body?
Ans: During circulation, blood transports food and oxygen to every cell of the body. Carbon dioxide and waste materials are also released with the help of blood circulation.
9. How many chambers does the human heart have? Give names.
- Right Atrium
- Left Atrium
- Right ventricle
- Left Ventricle
10. Describe the structure of the human heart.
It has four chambers.
1. Right Atrium 2. Left Atrium 3. Right ventricle 4. Left Ventricle
11. How does our heart work?
Ans: These are the blood vessels that are responsible for the transportation of blood throughout the body.
These are mainly divided into three kinds.
These are the Pulmonary veins that carry oxygenated blood from the lungs to the heart.
15. How can we keep our heart and blood vessels healthy and fit?
- Take foods high in fiber and low in fat.
- Take exercise regularly.
- Don’t smoke. smoking can increase your blood pressure.
19. What is asthma:
20. What are the symptoms of asthma?
Ans: The symptoms of an asthma attack may be cough, shortness of breath, wheezing, extreme difficulty in breathing, chest pain, sweating, and increased pulse.
21. What are the precautions to avoid asthma?
Ans: We can be normal and active even with asthma by acting upon the following tips.
- Try to avoid allergens of asthma.
- Use plenty of water, it gives relief.
- Use an inhaler or medicine on the advice of a doctor.
The xylem tissues of the root are responsible for the movement of water from the soil to the stem and then to the leaves.
The phloem tissues transport food from leaves to all parts of the plant like stem, roots, and flower, etc.
23. Describe the structure of the plant’s leaf.
Ans: Structure of a Leaf
Leaves are the food factories of plants. The upper layer of a leaf has a waxy layer cuticle to reduce water loss.
The lower layer of a leaf has stomata. The exchange of gases and transpiration takes place through stomata.
The midrib and veins of a leaf have xylem and phloem tissues. These tissues (xylem and phloem) or blood vessels transport water and food throughout the leaf.
24. What is transpiration?
Ans: The loss of water by evaporation from plants is called transpiration.
25. What is diffusion?
Ans: Diffusion is the movement of a substance from where it is in large amounts to where it is in small amounts.
26. How do plants transport materials?
Ans: Plants transport water and minerals from roots to leaves through xylem vessels.
Phloem transports prepared food from leaves to all other parts of the plants.
27. What is translocation?
Ans: The movement of prepared food from leaves to those parts of the plant’s bodies where it is needed is called translocation.