NCERT Class 10 Science Chapter 6 Life Processes Extra Questions and Answers
Class 10 Science Chapter 6 Extra Questions and Answers – Life Processes. Here in this Page Class X Students can Learn Extra Questions & Answer 6th Chapter Science fully Inside.
We Provided Here Life Processes Science Chapter 6 Long Answer Type Question, Very Short Type Questions (VSA) / Multiple Choice Type Questions, Short Type Questions (SA).
Class 10 Science Chapter 6 Extra Question with Answer – Life Processes
Science Chapter 6 Life Processes Class 10 Inside 5 Marks, 3 marks, 2 Marks & And 1 Marks Important Questions and Answers.
Que. 1. Attempt the following multiple choice questions:
1.) The carbohydrates which are not used immediately are stored in the plant bodies in the form of…………………………….
a.) Fats
b.) Starch
c.) Proteins
d.) Nucleic acids
Ans. b. starch
2.) Life on earth depends on ……………………………….. based molecules,
a.) carbon
b.) nitrogen
c.) hydrogen
d.) oxygen
ans. a. Carbon
3.) Desert plants take up carbon dioxide at ……………………….
a.) Night
b.) Midnight
c.) Day
d.) Evening
Ans. a. night
4.) These green dots present on the leaves are cell organelles which we call as…………….
a.) Vacuole
b) Chloroplasts
c.) Nucleus
d.) None of the above
Ans. b. chloroplasts
5.) …………..is an essential element which is used in the synthesis of proteins and other compounds.
a.) Phosphorous
b.) Iron
c.) Magnesium
d.) Nitrogen
Ans. d. Nitrogen
6.) gastric glands present in the wall of the…………………………..
a.) mouth
b.) stomach
c.) intestine
d.) anus
ans. b. stomach
7.) ………………………………………This is the longest part of the alimentary canal
a.) Stomach
b.) Small Intestine
c.) Large intestine
d.) Anus
Ans. b. small intestine
8.) The normal systolic pressure is about …………….and diastolic pressure is………………………
a.) 110 mm of Hg and 70 mm of Hg
b.) 120 mm of Hg and 80 mm of Hg
c.) 125 mm of Hg and 80 mm of Hg
d.) 10 mm of Hg and 90 mm of Hg
Ans. b. 120 mm of Hg and 80 mm of Hg
Que. 2. Answer the following in short:
1.) What are stomata?
Ans. stomata are the tiny pores present on the surface of the leaves of plants.
2.) What is secreted by the salivary glands?
Ans. salivary glands secrete saliva.
3.) What are called as biological catalysts?
Ans. Enzymes are called as biological catalysts.
4.) What are the secretions of gastric glands?
Ans. hydrochloric acid, pepsin, and mucus are secreted by the gastric glands present in the stomach
5.) Name the fluid connective tissue?
Ans. Blood is a fluid connective tissue.
6.) Define blood pressure?
Ans. blood pressure is the force that blood exerts against the wall of a blood vessel.
7.) How we can measure the blood pressure?
Ans. with an instrument called sphygmomanometer, blood pressure can be measured.
8.) What are capillaries?
Ans. capillaries are the smallest blood vessels which have one-cell thick walls.
9.) What are the life processes? Give examples.
Ans. The processes which together perform the maintenance job of our body are called as life processes. Ex- digestion/ nutrition, respiration, excretion, etc.
10.) What is Haemoglobin?
Ans. Haemoglobin is a respiratory pigment present in the blood of human beings.
3. Ans. the following questions.
1.) What is the energy currency for most cellular processes taking place in our body?
Ans. ATP (Adenosine Tri- phosphate) is the energy currency for most of the cellular processes taking place in our body.
2.) How can we control the urge to urinate?
Ans. The urinary bladder in humans is muscular i.e. made up of muscles, and it is directly under the nervous control whose control center is located in brain. This is the reason that we can control the urge to urinate.
3.) What is plasma? What is its role?
Ans. blood consists of plasma and blood cells. plasma is a fluid medium in which the blood cells are suspended.Plasma transports food, carbon dioxide and nitrogenous wastes in it in dissolved form across the body.
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4.) Describe the function of lymph?
Ans. Lymph carries digested and absorbed fat from intestine to different body parts and drains out excess of fluid from extra cellular space back into the blood.
5.) Define transpiration?
Ans. The loss of water in the form of water vapour from the aerial parts of the plant is known as transpiration.
6.) Write down the events that occur during the process of photosynthesis?
Ans.
(i) Absorption of light energy by pigments of chlorophyll.
(ii) Conversion of this light energy to chemical energy and splitting of water molecules
into hydrogen and oxygen.
(iii) Reduction of carbon dioxide to form carbohydrates.
7.) What is the function of stomata?
Ans. stomata are helpful for the gaseous exchange to carry out function of photosynthesis.Large amounts of water can also be lost through plant body with the help of these stomatal pores.
8.) Write the components of excretory system in human beings?
Ans. excretory system in human beings consist of pair of kidneys, a pair of ureters, a urinary bladder and a urethra.
9.) Define the process of respiration?
Ans. The process of acquiring oxygen from outside to inside the body, and to use it in the process of break-down of food sources for cellular needs, is called as respiration.
10.) What is the difference between starch and glycogen?
Ans. starch is the storage material used by plants whereas glycogen is the form ofa stored food material used by animals like humans.
11.) What is mean by translocation?
Ans.Transport of soluble products of photosynthesis through food conducting tissue known as phloem is called as translocation
12.) What are parasites?
Ans. Parasites are the animals which obtain their nutrition without killing their host organism. Ex- cuscuta (amar-bel), ticks, lice, etc.
Que. 4. Attempt the following long answer questions:
1.) Write a comment on guard cells?
Ans. The opening and closing of the Stomatal pore on a leaf is a function of the guard cells. The guard cells swells when water flows into them from outside, causing the stomatal pore to open. Similarly the stomatal pore closes if the guard cells shrink by loosing of the water from it.
2.) What is the reason behind herbivores like goat having longer small intestine whereas carnivores like lion have shorter small intestine?
Ans. Herbivores like goat eat grass hence need a longer small intestine to allow the enough time for cellulose to be digested. Whereas, meat is easier to digest as compared to cellulose which requires less time to get digested. Hence, carnivores like lion have a shorter small intestineas compared to herbivores like goat .
3.) What is transpiration? Why it is required to occur in plants body?
Ans. transpiration helps in the absorption and upward movement of water and dissolved minerals from roots to the leaves and the apex of plant body.It also helps in temperature regulation of the plant body.
4.) Describe nutrition in amoeba?
Ans. Amoeba is a unicellular organism which takes in food using temporary finger-like extensions of the cell surface called pseudopodia which fuse over the food particle and forming a food-vacuole. Inside this food vacuole, complex substances are broken down into simpler substances which then diffuse directly into the cytoplasm of the cell.The remaining undigested material is then moved to the surface of the cell and thrown out of the body. In this way, nutrition takes place in an unicellular organism like amoeba.
5.) Why aquatic organisms breathe more faster than the terrestrial organisms?
Ans. the amount of dissolved oxygen is low in water as compared to the amount of oxygen present in the air. Hence, to meet the need of energy, aquatic animals have to respire more faster to get enough oxygen as compared to that of terrestrial organisms.
6.) Why our muscles cramp during heavy activity like exercise?
Ans. while performing a heavy activity like exercise, our muscle cells require more amount of oxygen supply and that too in a continuous manner. But when there is a lack of oxygen in our muscle cells, another pathway for the break-down of pyruvate is taken. Here the pyruvate is converted into lactic acid to release energy and meet the instant energy needs. This excess of lactic acid gets accumulated in the muscle cells causing cramp in muscles.
7.) Write a note on excretion in plants.
Ans. Plants also generates waste products and need to excrete them regularly. For this, plants use lots of techniques. Oxygen is also a byproduct generated during the process of respiration is given out with the help of stomatal pores. Waste materials generated may be stored in the cell-vacuoles of plant cell and then excreted along with dead and falling leaf. Gum is also a type of excretory product of plant. It can also be excreted into the surrounding soil with the help of roots as resin.
8.) Plants give out carbon dioxide during night time and oxygen during day time. Justify.
Ans. during night time, the process of photosynthesis is not carried out by plants. Hence, while doing respiration, plants do intake of oxygen and they release carbon dioxide in air. But, during daytime, plants perform the process of photosynthesis in the presence of sunlight. Hence, they need carbon dioxide for this process and give out oxygen in the environment.
9.) What is hypertension? How constriction of arterioles can cause hypertension? Explain.
Ans. High blood pressure is also called as hypertension. The problem of hypertension is caused by the constriction of arterioles, thereby decreasing their lumen which results into increased resistance to blood flow, increasing the blood pressure.
10.) Describe the process of respiration in human beings.
Ans. Air is taken into the body of human being through the nostrils. The air passing through the nostrils is filtered by fine hairs which are present in the nasal passage. The nasal passage is also lined with mucous membrane which secretes mucus which helps in air filtration. From here, the air passes through the throat and into the lungs. Humans consists of a pair of lungs. Within the lungs, the passage divides into smaller and smaller tubes which finally terminate in balloon-like structures called as alveoli which provides a surface for the exchange of gases to take place. The walls of the alveoli contain an extensive network of blood-vessels around them. The deoxygenated blood from the rest of the body do come across the blood- vessels around alveoli and the oxygen in the alveolar air is taken up by this blood and then this oxygenated blood is then circulated throughout the body.
12.) Arteries are thicked walled but veins are not thicked walled but they are valved . Why?
Ans. Arteries are the blood vessels which carry oxygenated blood away from the heart to various
organs of the body where there is need of oxygen for the production of energy. Since the oxygenated blood emerges from the heart under high pressure, the arteries have thick and elastic walls to remain unbreakable under such a tremendous pressure. Veins collect the deoxygenated blood from different organs and take it back to the heart. Veins do not need to be thicked walls because the deoxygenated blood is no longer under tremendous pressure, instead they have valves that ensure that the blood should flow only in one direction to prevent its mixing with the oxygenated blood. .
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