PLZŹŹZZZZZZZZZZZZZZZZZZZZZ URGENT I WILL MARK YOU AS A BRAINLIEST 5. How does heart avoid mixing of blood?
6. Why do arteries have thick wall?
7 Select the odd one out giving reason.
Urea, uric acid, amino acid, carbohydrate
8. How do aquatic animals like fishes excrete their waste?
9. Why aquatic animals like sponges and hydra do not posses blood?
10. What kind of blood is carried by capillaries?
III. SHORT ANSWER: (3 marks)
1. Paheli uprooted a rose plant from the soil, most of the 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?
2. It was a hot summer day when trisha planted a new sapling in the balcony. The sunlight was too hot to
bear. After few hours Trisha observed that the leaves of the plant have wilted down. Trisha started crying
that her plant will die. But her mother told her that she will make it normal after sometime
a) What has happened with the plant?
b) How will Trisha's mother make the plant normal?
3. Paheli noticed that water being pulled up by a motor pump to the tank of five floor building. She
wondered how water moves up to great height in the tall trees. Can you tell, why?
4. Plants do not use all water they absorb from soil. Then why do they absorb so much water?
5. 'Plants need both oxygen and carbon dioxide, but both are included as waste' Comment
6. What causes heart beat? Is there any similarity between heartbeat and pulse rate?
7i) What is the significance of partition between the chambers of heart?
ii) How does sweat help keep you cool?
8. Why is blood needed by all the parts of the body?
9. 1) What happens if blood do not contain platelets?
1) Why haemoglobin is important for human body?
iii) Can a person survive if his/her one kidney alone is functioning properly. How?
10.1) Write any two causes that damage the human kidney.
ii)Does donating blood decrease the strength of a person?
11. 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?
12. 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.
Answers
Answer:
5. Blood provides oxygen and nutrients to the body and removes carbon dioxide and wastes. ... Oxygen-rich blood flows from the lungs back into the left atrium (LA), or the left upper chamber of the heart, through four pulmonary veins. Septum separates the blood.
6. Thick walls of arteries help them to resist the pressure of flow of blood in them. Arteries are elastic so as to produce enough pressure to push the blood and help it flow.
7.Carbohydrate because carbohydrate is a useful material for the body but all others are waste substances.
8. aquatic animals like fishes excrete their waste through gaseous form Ammonia. The nitrogenous food such as legumes are ingested by the fish and converted into cellular waste. It reacts with water to form ammonia gas that is released in the atmosphere through the excretory system.
9. Animals such as sponges and Hydra do notposses 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.
10. Capillaries connect the arteries to veins. The arteries deliver the oxygen-rich blood to the capillaries, where the actual exchange of oxygen and carbon dioxide occurs. The capillaries then deliver the waste-rich blood to the veins for transport back to the lungs and heart.
1. The plant will die because the roots are left behind in the soil which by which the water would not be not able to be transferred in the different parts of the plant. So it will die.
2. a) The water in the leaves of the plant has been evaporated. So it has been dried.
b) By keeping it in water for some time.
3) By the phloem part of the plant. it has some suction force in the phloem.
4) Plants absorb water from soil by roots through xylem vessels.These xylem vessels transports water from roots to shoot and here not all water is not used by plant.A process called transpiration occurs through stomata of leaves to create suction pull to enable plant to absorb water from soil.
5) The answer is that all plant cells need oxygen to live, because without oxygen they can't perform aerobic respiration (respiration is the process of breaking down food to get energy). Of course you probably know that when plants perform photosynthesis, they combine water, carbon dioxide, and the sun's energy to produce sugar and oxygen. So the cells in the green parts of the plant, where photosynthesis is taking place, get all the oxygen they need from the oxygen produced by photosynthesis. So cells in the leaves and stems are okay. The trick is the cells down in the roots, where there is no photosynthesis.
6)The heart rate measures how many times the heart beats in 60 seconds The electrical activity spreads through the walls of the atria and causes them to contract. This forces blood into the ventricles. The SA node sets the rate and rhythm of your heartbeat.
7) i) The vertical partition, or septum allows for the creation of two discrete circulatory pathways. The pulmonary and systemic circulatory systems. The pulmonary system, being a low pressure (peak systolic pressure of 30mmHg), generated by the right ventricle which allows for blood to pumped through the pulmonary allowing for gaseous exchange carbon dioxide elimination and oxygenation.
ii) Sweat helps cool you down by releasing moisture onto your skin. But that's not all that's going on. On a hot day, your sweat evaporates from your skin taking a little bit of your body heat with it
8) Blood brings oxygen and nutrients to all the parts of the body so they can keep working. Blood carries carbon dioxide and other waste materials to the lungs, kidneys, and digestive system to be removed from the body
9) i) When you don't have enough platelets in your blood, your body can't form clots
ii) There may also be a chance of having high blood pressure later in life. However, the loss in kidney function is usually very mild, and life span is normal. Most people with one kidney live healthy, normal lives with few problems
11)a) Dialysis is the artificial way to remove unwanted substance.
b) When one of the kidney gets failed.
12) This is because of platelets in our body. It clots the blood to prevent any further leakage of blood.
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