DAV Class 7 Science Chapter 8 Transportation in Plants and Animals Question Answer Notes
DAV Class 7 Science Chapter 8 Transportation in Plants and Animals Question Answer Notes Solution by Expert Science Teacher. DAV Class 7 Science 8th Chapter Transportation in Plants and Animals for Students of DAV Schools.
Lesson No 8
Transportation in Plants and Animals
A.) Fill in the blanks.
Answer: (1) xylem (2) Haemoglobin (3) atria, ventricles (4) Septum (5) diffusion
B.) Write True or False for the following statements.
Answer: (1) True (2) False, it is useful for plants (3) True (4) False, arteries carry pure blood to different parts of the body (5) True (6) False, it is due to the presence of iron . (7) True
C.) Tick the correct option.
Answer:
1.) diffusion
2.) xylem
3.) arteries
4.) RBCs
5.) urinary bladder
D.) Answer the following questions in brief.
Q.) 1.) What will happen if the xylem tissue gets damaged in a branch of a tree?
If the xylem tissue in one of a tree’s branches is destroyed, the tree’s capacity to absorb water and nutrients would be compromised. If the xylem is unable to transport nutrients and water to the leaves, they will not be able to photosynthesize and produce food for the tree. A branch will eventually deteriorate and lose its branches and foliage in the absence of nutrients. The disruption of the water flow and nutrients will further harm the tree in addition to reducing its defenses against pests and diseases. As the branch rots and decays, flies, fungus, including bacteria will be attracted to it; they can then spread to other parts of the tree and do more damage.
2.) Define transpiration.
Transpiration is the process by which plants release water vapor into the atmosphere through their stomata, or pores. It is a form of evaporation and is an important part of the water cycle.
3.) Name the three types of blood vessels.
1.) Arteries: These are the thickest and most muscular blood vessels that transport oxygenated blood away from the heart.
2.) Veins: These are the thin-walled vessels that return deoxygenated blood back to the heart.
3.) Capillaries: These are the smallest vessels that connect arteries and veins and allow for the exchange of nutrients, oxygen, and waste between the blood and the tissues.
5.) Define the term ‘pulse rate!
Pulse rate is the number of times the heart beats per minute. It is also known as heart rate and is typically measured by feeling the pulse in the wrist or neck. Pulse rate can be affected by a variety of factors, including physical activity, stress, and medications. It is important to know what a healthy pulse rate is for an individual and to be aware of any changes in the rate that may be due to a medical condition or other factors.
E.) Answer the following questions.
Q.) 1.) Briefly explain the transport of water and minerals in plants.
Transport of water and minerals in plants occurs through a process known as transpiration. Water is taken up from the roots and transported to the leaves via the xylem tissue. Minerals are absorbed through the roots from the soil and transported throughout the plant via the phloem tissue. Transpiration is the process of water evaporating from the leaves, drawing more water up through the xylem. This process is driven by the evapotranspiration rate, which is the rate at which water evaporates from the leaves and is replaced by more water coming up through the xylem. As the water evaporates, it creates a negative pressure in the xylem, which forces more water up the plant. This process is known as the transpiration stream. As the water moves up the plant, minerals are also drawn up through the xylem, allowing them to be transported throughout the plant.
Q.) 2.) Describe, in brief, the function of heart.
The heart is a muscular organ that pumps blood throughout the body, supplying oxygen and nutrients to the organs and tissues. It also removes carbon dioxide and other wastes from the body. The heart beats about 60 to 80 times per minute and pumps about 5 liters of blood per minute.
Q.) 3.) State the functions of the three types of blood vessels.
Arteries: Arteries are in responsible for transporting oxygen-rich blood from the heart to the organs and tissues of the body.
Veins: Veins are responsible for carrying deoxygenated blood back to the heart.
Capillaries, which are minuscule, thin-walled channels that connect arteries and veins, promote the exchange of oxygen, nutrients, and waste materials between the tissues and the blood.
Q.) 4.) Give one function each of RBC, WBC and platelets.
- RBC (Red Blood Cells): Red blood cells, the most common type of cell in the body, are crucial for transporting oxygen and carbon dioxide throughout the entire body. They are in charge of transporting oxygen to the body’s cells and tissues and removing waste products like carbon dioxide from the body.
- WBC (White Blood Cells): An immune system component known as white blood cells is in charge of protecting the body from disease and infection.
- Platelets: Blood clots can only form when platelets, which are tiny, disc-shaped cells, are present. After leaving the bone marrow, they move about in the bloodstream. Platelets help stop bleeding as well as assist in blood vessel repair by causing clotting at the site of inflammation or injury.
Q.) 5.) Draw a neat and well labelled diagram of the human excretory system.
Answer –
More Extra Questions for Preparation
Q.1.) Fill in the blanks.
1.) The circulatory system in higher animals consists of heart, blood vessels and blood.
2.) A valve divides each side into upper atrium and lower ventricle.
3.) Arteries carry carbon dioxide.
4.) The human heart beats 60 to 80 times per minute.
5.) Body has 5 – 6 litres of blood.
6.) Veins carry deoxygenated blood .
7.) The process of removal of wastes produced by living organisms is called excretion.
8.) Blood is red due to presence of haemoglobin.
Q.2.) What are functions of blood.
Answer= Functions of blood are
1.) Blood helps to distribute the digested food to all parts of the body.
2.) Blood helps to maintain the body temperature.
3.) Blood transports the oxygen from lungs to tissues.
4.) Blood also transports the Carbon dioxide from tissue to the lungs.
5.) Blood platelet helps in clotting of blood.
6.) Blood cells like WBC help to fight against infections.
Q.3.) Explain systole and diastole.
Answer= Systole – The contraction of the heart is called as systole.
Diastole – The relaxation of the heart is called as diastole.
Q.4. Explain functions of the lungs.
Answer= Carbon dioxide produced by cells during respiration is removed through lungs by exhalation.
Q.6.) Define the following.
1.) Transportation.
Answer – The process of movement from one location to another in an organism is called transportation.
2.) Transpiration.
Answer – Transpiration is evaporation of water molecules in form of water vapours from plant surface.
Q.7.) True or false.
1.) Haemoglobin is known as respiratory carrier.
Answer – True
2.) Deoxygenated blood flows in left atrium and then to all parts of body.
Answer – False
3.) Diffusion and osmosis help in the movement of different substances.
Answer – True
8.) What are components of blood?
Answer – Blood is made up of two components
a.) The cell components that includes RBC’s, WBC’s and platelets.
b.) The liquid component called blood plasma.
Q.9.) What includes in transpiration in animals?
Answer – a.) Digested food
b.) Oxygen
c.) Carbon dioxide
d.) Excretory waste, etc.
10.) Explain transpiration in plants.
Answer –
a.) Transpiration is evaporation of water molecules in form of water vapours from plant surface.
b.) The plants absorb water and minerals nutrients from the soil.
c.) Transpiration is beneficial to the plants.
d.) It creates suction pull which helps water to be transported to tall trees.
e.) Transpiration also helps the plants to lower it’s temperature.
10.) Multiple choice questions.
1.) defence force of the body.
a.) RBC
b.) WBC
c.) Platelet
d.) Blood plasma
Answer – b.) WBC
2.) helps in clotting of blood.
a.) RBC
b.) WBC
c.) Platelet
d.) All of these.
Answer – c.) Platelete.
3.) Counting of pulse is done by .
a.) Glucometer
b.) Thermometer
c.) Pulse meter
d.) None of these
Answer – c.) Pulse meter
Q.11.) Difference between Vein and Artery
Vein | Artery |
1. Veins carry oxygen deficient and carbon dioxide rich, blood back to the heart. | 1. Artery carry oxygen rich and carbon dioxide deficient blood from heart to all other parts of the body. |
2. Veins have thinner walls. | 2. Arteries have thick elastic walls. |
3. Blood flows at a lower pressure. | 3. Blood flows at higher pressure. |
Q.12.) Draw the labelled diagram of human excretory system.