Basic Science Solutions for Class 7 Science Chapter 10 Transport And Excretion are provided here with simple step-by-step explanations. These solutions for Transport And Excretion are extremely popular among Class 7 students for Science Transport And Excretion Solutions come handy for quickly completing your homework and preparing for exams. All questions and answers from the Basic Science Book of Class 7 Science Chapter 10 are provided here for you for free. You will also love the ad-free experience on Meritnation’s Basic Science Solutions. All Basic Science Solutions for class Class 7 Science are prepared by experts and are 100% accurate.

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A plant has a network of tubes called xylem tissue that runs throughout the plant's body. It carries water absorbed by roots to the leaves of the plant.

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A doctor feels the pressure of blood flow against the walls of the arteries when he checks our pulse.

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Heart is divided into two parts by a thick wall to prevent the deoxygenated blood in the right half from mixing with the oxygenated blood in the left half.

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Organs comprising the urinary system are:
• A pair of kidneys
• A pair of tubes called ureters
• Urinary bladder
• Urethra

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The waste, after getting filtered by the nephrons, is collected in larger tubes called ureters. The waste finally reaches the urinary bladder through the ureters.

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When two solutions are separated by a semi-permeable membrane, the concentration of these solutions determines the direction of the flow of the substances during osmosis.

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When we sweat, we excrete urea along with water.

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The roots of plants absorb water from the soil because of which a force of push is created. This force pushes the absorbed water upwards. Also, Plants keep on losing water from leaves through transpiration, which creates a pull on the absorbed water. These forces of pull and push work together to move the water up through the stem to leaves from the roots, against the force of gravity.

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The right side of our heart receives blood from all over the body. The right atrium receives deoxygenated blood from major veins and transfers it to the right ventricle which pumps this blood to the lungs, where it gets oxygenated. Lungs send oxygenated blood to the left atrium of the heart and the blood then reaches the left ventricle. The left ventricle pumps the blood back to different parts of the body and the blood keeps circulating.

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Every object has a certain amount of heat energy. Our skin also has heat. When we sweat, the water in the sweat absorbs this heat and evaporates. This absorption of heat from our skin brings down the temperature of our skin and we feel cool. This is how sweating helps in maintaining our body temperature.

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When an egg without its shell is placed inside a water bowl, it swells because the water from the bowl starts flowing inside the egg. The inner membrane of  egg behaves like a semi-permeable membrane. Egg has a higher concentration of solutes than the bowl, thus, the solvent, i.e., water, starts moving inside the cell by osmosis.



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The roots of a plant have minute hair-like structures called root hair. They are unicellular and have a very thin cell membrane, which is semipermeable in nature. Every root hair has a solution of important biological material inside it, which is separated from the water solution present in the soil by semipermeable cell membrane. The concentration of water in the soil is more than the concentration of water in the root hair. Due to this difference in the concentration of these solutions, osmosis occurs and water moves inside the roots from soil.

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Nephrons are very small funnel-like  structures present in the kidneys. There may be as many as 1.5 million nephrons in one kidney. Nephrons help in filtering the blood entering our kidneys. Every nephron is associated with a meshwork of blood capillaries. Blood flows through this meshwork and gets filtered. Waste products are filtered out into the tubes associated with these nephrons and important substances in the blood like blood cells, haemoglobin, glucose etc., stay behind in the blood. These waste products are collected into larger tubes from the small tubes, which finally lead this waste to ureters. These ureters lead this waste to urinary bladder where it is temporarily stored and gets excreted finally from the body through urethra.

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Kidneys in our body function as a filter for blood and help our body to get rid of waste products generated in the body. In some people, the kidneys stop functioning and their bodies start accumulating waste products, which may be fatal. In such a situation, blood is artificially purified by taking it out of the arteries in a system of tubes dipped in a fluid. These tubes are semipermeable in nature and the fluid in which they are dipped has a lower concentration of water than blood. Thus, osmosis occurs and along with water, waste material flow out into the fluid from blood in these tubes. The pores in these tubes are large enough to allow the passage of water and waste through them but they stop important materials to flow out of blood. Thus, they act exactly like the capillary system in the nephrons. The process in which blood is artificially purified outside the body in case of a kidney failure is called dialysis.

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1. Food is carried from the leaves by pipes formed by phloem tissue.
2. The solution of water and minerals that moves upwards from the root is called cell sap.
3. The contraction and relaxation of the heart is called heartbeat.
4. A membrane which allows some substances to pass through but not others is called semi-permeable membrane.
5. Stomata are present mostly on the lower surface of leaves.
6. Each side of the heart is divided into an upper chamber called atrium and a lower chamber called ventricle.

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(c) transpiration
The process by which a plant loses water through the stomata is called transpiration.

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(a) proteins
 Proteins have an ammonium group associated with them. When proteins are processed, the ammonia group forms urea, which is a waste for our body.

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(b) capillaries
Capillaries have a thickness of a single cell and a very thin wall that allows these materials to pass through.

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(b) 72 per minute
The normal pulse rate is around 72 per minute.

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A B
(a) White blood cells (v) Help fight infections
(b) Red blood cells (iii) Look like discs
(c) Platelets (ii) Help in the clotting of blood
(d) Plasma (vi) The liquid part of blood
(e) Arteries (vii) Carry blood away from heart
(f) Veins (iv) Carry blood to heart
(g) Haemoglobin (i) Protein that helps transport oxygen



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