These AP 7th Class Science Important Questions and 7th Lesson Transportation in Animals and Plants Class 7 Extra Questions will help students prepare well for the exams.
Class 7 Science Transportation in Animals and Plants Extra Questions
Transportation in Animals and Plants Class 7 Important Questions
Question 1.
Name the organ which is located in the chest cavity with its lower tip slightly tilted towards the left.
Answer:
The heart is the organ located in the chest cavity with its lower tip slightly tilted towards the left. It is roughly the size of a fist and beats continuously to act as pump for the transport of blood.
Question 2.
What is pulse?
Answer:
The throbbing sensation that occurs in arteries due to flowing of blood is called pulse.
Question 3.
What is heart beat?
Answer:
The rhythmic contraction and relaxation of heart muscles that produce a specific sound of lubb-dubb is called heartbeat.
Question 4.
What does the xylem transport?
Answer:
The function of the xylem is to transport water and nutrients from the roots to all parts of the plant.
Question 5.
Define blood.
Answer:
Blood is a fluid tissue that flows in blood vessels. It is red in colour and it flows through a network of tubes in whole body called blood vessels. It helps to carry nutrients and oxygen and removing waste materials.
Question 6.
What is platelet?
Answer:
Blood platelets are small, irregular, disc shaped particles formed in the bone marrow. These are colourless and help in the clotting of blood in a cut or wound.
Question 7.
What is meant by excretion?
Answer:
The process of removal of waste materials produced in the cells of the living organism is called excretion.
Question 8.
What is urine?
Answer:
The mixture of various wastes with water filtered from the blood is called urine.
Question 9.
What is the purpose of using stethoscope by doctors?
Answer:
A stethoscope reads heartbeats as diaphragm amplies the rounds of heartbeat when placed on specific areas.
Question 10.
Who discovered the circulation of blood?
Answer:
The English physician, William Harvey discovered the circulation of blood.
Question 11.
What is pulse rate?
Answer:
The number of beats per minute is called the pulse rate.
Question 12.
What is vascular tissue?
Answer:
Plants have pipie-like vessels to transport water and nutrients from the soil are called vascular tissues.
Question 13.
What do you mean by Xylem and Phloem?
Answer:
Xylem : The vascular tissue for the transport of water and nutrients in the plant is called the xylem.
Phloem : The food has to be transported to all parts of the plant by the vascular tissue called the phloem.
Question 14.
Define red blood cells.
Answer:
Red blood cells are disc shaped, biconcave cell in the blood that contains haemoglobin, lacks a nucleus and transports oxygen and carbon dioxide to and from the tissues.
Question 15.
What are ventricles?
Answer:
The two lower chambers of heart are called ventricles.
Transportation in Animals and Plants Extra Questions
Question 1.
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:
Possible changes may take place:
- Without the root hairs, the roots will not be able to absorb water and nutrients and the plant will die.
- The stem of the rose plant may grow into new plants, hence plant survives.
- The rose plant may not be able to survive in a different type of soil.
Question 2.
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) The pulmonary artery carries blood from left ventricle to the lungs carries carbon-dioxide rich blood.
b) The pulmonary artery does not carry oxygen rich blood but it carries blood away from the heart like all other arteries. Therefore, it is called an artery.
Question 3.
What is circulatory system?
Answer:
Circulatory system or blood circulatory system is the main transport system in human beings and animals.The transport system carries materials like carbon dioxide, oxygen and nutrients to the different parts of the body with the help of circulating fluid i.e. blood.
Question 4.
What do you mean by dialysis ? Explain.
Answer:
Dialysis is the artificial process used for getting rid of waste and unwanted water from the blood by the machines. Dialysis machines contain a tank with solution of water, glucose and salt. The blood of the patient is allowed to pass through the solution and for the removal of the wastes. The cleaned blood is pumped back to a vein.The dialysis continues till entire blood has been purified.
Question 5.
Differentiate between arteries and veins.
Answer:
Differences between arteries and veins are as follows :
S.No. | Arteries | Veins |
1) | They carries pure blood from heart to different organs of the body. | They collect the impure blood from different parts of the body. |
2) | They carry oxygenated blood, except pulmonary artery. | They carry oxygenated blood, except pulmonary vein. |
3) | They are thick walled and deeply seated. | They are thin walled and superficially located beneath the skin |
4) | They have no valves. | They have also to prevent back flow of blood. |
Question 6.
Why do sponges and hydra lack blood ?
Answer:
Animals such as sponges and Hydra do not posses any circulatory system. The water in which they live brings food and oxygen as it enters their bodies. The water carries away waste materials and carbon dioxide as it moves out. Thus, these animals do not need a circulatory fluid like the blood.
Question 7.
Write the differences between RBCs and WBCs.
Answer:
Differences between RCBs and WBCs are as follows :
S.No. | RBCs | WBCs |
1) | They have biconcave disc shaped. | They have irregular shape. |
2) | They are red in colour. | They are colourless. |
3) | They are rich in haemoglobin. | They are lack of haemoglobin. |
4) | They are non-motile. | They are motile. |
5) | They do not have a nucleus at maturity. | They have a large characteristic nucleus. |
6) | Their life span is 120 days. | They have a short life span of 5 to 20 days. |
Question 8.
What are the three main types of blood vessels and write their functions?
Answer:
The three main types of blood vessels are:
- Arteries : These are the blood vessels which carry oxygenated pure blood from heart to all other parts of the body.
- Veins : These are the blood vessels which collects the deoxygenated impure blood from the whole body and send it to the heart.
- Capillaries: These are the network of thin tube like structures which connect the arteries and veins together.
Question 9.
Name the process and the organ which help in removing the following wastes from the body.
a) Carbon dioxide
b) Undigested food
c) Urine
d) Sweat
Answer:
S.No. | Root hairs | Xylem | Urethra |
1) | Arteries | Kidneys | Veins |
2) | Atria | Capillaries | Heart |
3) | Ureter | Pholem | Urinary bladder |
Question 10.
What are the functions of blood ?
Answer:
The functions of blood are:
- It carries oxygen from the lungs to the cells of the body.
- It transports waste for removal from the body.
- It regulates the body temperature.
- It transports the digested food to all parts of the body from small intestine.
Question 11.
What is transpiration? How it is useful to the plants?
Answer:
Transpiration is the loss of process of evaporation of excess through stomata in plants. This process helps plants to supply water from roots to top parts of plants thereby distributing water to all parts of the plant. It also helps in keeping the plants cool.
Question 12.
What is transportation ? Where does it takes place?
Answer:
Transportation is the process of transport of soluble products of photosynthesis from the leaves to other parts. It occurs in phloem.
Question 13.
What is sweat ? Write any two functions of sweat.
Answer:
Sweat is the liquid waste of the body that is produced by the sweat glands present in our skin. Sweat contains water, some unwanted salts and urea in a very small amount.The two major functions of sweat are as follows :
- It helps to remove excess water, salt and urea from the body.
- It helps to keep our body cool during hot summer days.
Extra Questions of Transportation in Animals and Plants Changes Class 7
Question 1.
Read the following terms given below.
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:
The terms on the basis of the categories mentioned above can be grouped as follows:
a) Circulatory system : Arteries, atria, capillaries, veins, and heart together form the circulatory system.In the circulatory system, the heart (consists of two atria and two ventricles) acts as a pump to put out blood. The blood vessels (arteries, veins and capillaries) act as tubes through which blood flows in the whole body.
b) Excretory system: Urethra, kidneys, ureter and urinary bladder form the excretory system in human.The excretory system of human consists of two bean-shaped kidneys that filter blood to form urine. Urine goes into, the urinary bladder through tubes called ureters. It goes out from body through the opening at the end of a tube called urethra.
c) Transport of substances in plants: Root hairs, xylem and phloem are transport of . substances in plants.Transport system in plants consists of xylem and phloem. The water absorbed by root hairs from soil reaches xylem to move upward to stem, branches and leaves. Phloem carries food from leaves to other parts.
Question 2.
Describe the process of absorption and transportation of water and minerals in plants?
Answer:
The plant root have root hairs which absorb water and minerals in the form of solution from soil. This process is called absorption. This water and minerals are then transported to other parts of plant i.e., stem, leaves and flowers through a special tissue called xylem. Then food is synthesised within leaves of plant and is transported in all parts of plant including roots, through phloem. There produces are called transportation.
Question 3.
Describe the structure of the human heart.
Answer:
a) Heart is a triangle shaped organ. It is made up of a cardiac muscles. It is located in the chest cavity slightly towards the left side.
b) It lies between the two lungs and above the diaphragm.The size of our heart is roughly equal to our left closed and is enclosed in a protective cover called pericardium fist. The heart is hollow inside.
c) It pumps blood to all parts of the body. It beats 72 to 80 times per minute throughout the life.
d) The heart has four compartments called as chambers. The upper two chambers of heart are called atria (singular, atrium) and the lower two chambers of heart are called ventricles.
e) On the left side of heart are left atrium and left ventricle and on the right side of the heart are right atrium and right ventricle.
f) The heart is separated by a partition called septum (from right side of the heart to the left side) to avoid mixing of pure and the impure blood. The chambers contain valves which ensure the flow of blood in one direction only.
g) The right auricle receives carbon dioxide rich blood from various parts of the body. The right ventricle pumps, the blood to the lungs. Inside lungs, carbon dioxide is exchanged with oxygen.
h) The left article receives oxygen rich blood from the lungs. The left ventricle pumps, this a blood to the rest of the body.
Question 4.
Explain the excretion in birds, lizards, fishes, and dogs and humans.
Answer:
The way of elimination of waste products from the body of animals depends upon the availability of the water.The animals like lizards, birds, snakes, etc., have less water availability. These animals excrete a white colour, semi solid product waste material in the form of uric acid pellets. Aquatic animals like fishes excrete ammonia as their waste product. This ammonia is excreted in the gaseous form which directly gets dissolved in water. Dogs and human beings excrete urea.
Question 5.
Explain human circulatory system with the help of a diagram.
Answer:
Circulating system is the life support system of our body that provide our body cells with nutrients and oxygen. It takes away waste products from the body. Since our circulatory system consist of heart, blood, blood vessels and lungs.
- Blood is the fluid that carry oxygen and nutrients to various parts of the body and it takes away waste and carbon dioxide from the cells for elimination.
- Blood vessels comprises of arteries, veins, and capillaries. Arteries carry oxygen-rich blood from the heart to all parts of the body.
- Veins are the vessels that carry carbon dioxide rich blood from all parts of the body back to the heart.
- Capillaries are single walled vessels which exchange of gases and nutrients from the cells.
- Heart is a muscular organ with four chambers which pumps blood throughout the body. It pumps carbon dioxide rich blood to the lungs for purification.
- When it receives oxygen rich blood from the lungs it again pump this blood to arteries transportation to various body parts.
- Lungs help in the exchange of gases between air we breathe in and the blood. It helps in the elimination of carbon dioxide from blood and making it rich in oxygen content.
Question 6.
Explain the excretory system in human beings.
Answer:
When our body uses food, water and air, it produces some by-products or unwanted substances. These are called waste materials. The waste materials are present in the blood has to be removed from the body. A system to filter the waste is required. This is done by the blood capillaries in the kidney. When the blood reaches the two kidneys, it contains both useful and harmful substances.
The useful substances are absorbed back into the blood after filtration in kidneys. The waste dissolved in water is removed as urine. From the kidneys, the urine goes into the urinary bladder through tubes called ureters. It is stored in the bladder and is passed out through the muscular tube called the urethra. The kidneys, ureters, urinary bladder, and urethra form the excretory system in humans.
Case Based / Data – Based Questions
While learning bicycle, Mohan lost his balance and fell down. He got a cut on his knee and it started bleeding. Her brother Ramu, on seeking this asked him to put pressure on the area with a clean handkerchief. He immediately rushed to his home to call his parents.
a) How does applying pressure to a bleeding would help?
Answer: By applying a pressure to a bleeding would we restrict the blood vessels manually and prevents too much loss of blood from the wound.
b) When we get a small bruises, blood stops automatically after sometime. Why?
Answer: Bleeding stops automaticaliy in small bruises after sometime due to clotting of blood.
c) What would be the colour of wounded area? Why?
Answer: The colour of the wounded area will be dark red due to the formation of clot.
d) Which type of blood cells are responsible for clotting of blood?
Answer: Blood platelets are responsible for clotting of blood.