CBSE Class 10 Biology Life Processes Worksheet Set D

Read and download free pdf of CBSE Class 10 Biology Life Processes Worksheet Set D. Students and teachers of Class 10 Biology can get free printable Worksheets for Class 10 Biology in PDF format prepared as per the latest syllabus and examination pattern in your schools. Standard 10 students should practice questions and answers given here for Biology in Grade 10 which will help them to improve your knowledge of all important chapters and its topics. Students should also download free pdf of Class 10 Biology Worksheets prepared by school teachers as per the latest NCERT, CBSE, KVS books and syllabus issued this academic year and solve important problems provided here with solutions on daily basis to get more score in school exams and tests

Life Processes Class 10 Biology Worksheet Pdf

Class 10 Biology students should refer to the following printable worksheet in Pdf for Life Processes in standard 10. This test paper with questions and answers for Grade 10 Biology will be very useful for exams and help you to score good marks

Class 10 Biology Worksheet for Life Processes

CBSE Class 10 Biology Worksheet - Life Processes - Practice worksheets for CBSE students. Prepared by teachers of the best CBSE schools in India.

Assignments for First Term Class –X

Biology ASSIGNMENT 1

 LIFE PROCESSES

Quetion. What are the methods used by plants to get rid of excretory products?
Ans. To get rid of excretory products, plants use the following ways:
(1) The plants produce carbon dioxide as a waste product during respiration and oxygen as a waste product during photosynthesis. The plants get rid of gaseous waste products through stomata in their leaves and lenticels in stems.
(2) Many waste products are stored in vacuoles of the cells. Plant cells have comparatively large vacuoles. Some waste products are stored in the leaves. They are removed as
the leaves fall off.
(3) Some waste products such as resins and gums are stored, especially in non- functional old xylem.
(4) Some waste products such as tannins, resins, gums are stored in bark, thereby removed as barks are peeled off. (-) Plants excrete some waste products through roots into the soil around them. (-) Plants also get rid of excess water through transpiration.

Quetion. If human urine is allowed to stand for sometime, it smells of ammonia, why?
Ans. Urea present in urine gets decomposed into ammonia by the action of bacteria. So it smells strongly of ammonia

Quetion. Name the two ways in which glucose is oxidized to provide energy in various organisms.
Ans. The two ways in which glucose is oxidized to provide energy in various organisms are Aerobic respiration and Anaerobic respiration. into a new complete organism.

Quetion. Why do fishes die when taken out of water?
Ans. Fishes respire with the help of gills. Gills are richly supplied with blood capillaries and can readily absorb oxygen dissolved in water. Since fishes cannot absorb gaseous oxygen, they die soon after they are taken out of water.

Quetion. Answer the following:
(A) mention the adaptations of leaf for photosynthesis.
(B) Why does absorption of digested food occur mainly in small intestine?
Ans. (A) The adaptations of leaf for photosynthesis are as follows:
(1) Leaves have chlorophyll i.e. the main site for photosynthesis.
(2) The shape of the leaves enables to absorb maximum sunlight for photosynthesis.
(3) Leaves have stomata which help in gaseous exchange and transpiration. Stomata help the leaves in taking in carbon dioxide and raw material for photosynthesis.
(4) The wide network in leaves helps in transport of water to the leaves and prepared food to the entire plant from the leaves.
(B) Maximum absorption of digested food occurs in small intestine due to following reasons
(1) Digestion process gets completed in small intestine.
(2) Inner lining of small intestine is provided with has millions of tiny, finger like projections called Villi. Each Villus has a network of fine blood capillaries close to the surface. The presence of Villi  gives the inner walls of small intestine greater surface area which helps in rapid absorption of food.
(3) Wall of intestine is richly supplied with blood vessels through which the absorbed food is taken to each and every cell of the body.

Quetion. How do carbohydrates, proteins and fats get digested in human beings?
Ans. Digestion of carbohydrates: The human saliva contains an enzyme called slivery amylase which digests starch (carbohydrate) present in food into maltose sugar. Thus, the digestion of carbohydrate begins in the mouth itself. When the slightly digested food reaches the small intestine, pancreatic amylase present in the pancreatic juice breaks down the starch into maltose. The walls of the small intestine secrete the intestinal juice (maltose) which finally converts it into glucose and completes the digestion of carbohydrates. Digestion of proteins: The digestion of proteins begins in the stomach. In the stomach, gastric glands secrete gastric juice which contains an enzyme called pepsin which converts the proteins into peptones. Pancreatic juice contains trypsin which digests the proteins into peptides and the intestinal juice completes the process of digestion of proteins, thus converting it into amino acids. Digestion of fats: The digestion of fats begins in the stomach. In the stomach, gastric glands secrete a small amount of gastric lipase that breaks down the fats present in the food. In the small intestine, the pancreatic lipase breaks down the emulsified fats. The intestinal juice, secreted by the walls of small intestine, finally converts the fats into fatty acids and glycerol.

Quetion. (A) Write the function of the following in the human alimentary canal:
(i) Saliva
(ii) HCl in stomach
(iii) Bile juice
(iv) Villi
(B) Write one function each of the following enzymes:
(i) Pepsin
(ii) Lipase 
Ans. (A) Function of given substances in
(i) Saliva:
(1) Saliva moistens the food so it can be swallowed easily.
(2) Saliva contains the enzyme salivary amylase that breaks some starches into sugar.
(ii) HCl in stomach:
(1) The hydrochloric acid creates an acidic medium which facilitates the action of the enzyme pepsin.
(2) It also kills germs or pathogens.
(iii) Bile juice:
(1) It makes the acidic food coming from the stomach alkaline, so as to enable the action of pancreatic enzymes.
(2) It contains bile pigments and bile salts which carry out emulsification of fats.
(iv) Villi:
(1) These are finger-like projections present in the inner lining of the small intestines which increase the surface area for absorption.
(2) In the large intestine villi absorb water from the unabsorbed food.
(B) Function of enzymes is given below:
(i) Pepsin: It is found in gastric juice and digests proteins found in ingested food.
(ii) Lipase: It digests the emulsified fats and converts it to fatty acids and glycerol.

Quetion. What would happen if platelets were absent in the blood?
Ans. The blood has platelet cells which circulate around the body and help to clot the blood at the time of inury. In the absence of platelets, the process of clotting will be affected. Platelets play the important role of coagulation of blood. No blood coagulation would take place in the absence of platelets. This would be a dangerous situation in case of an inury, at it would result in excessive blood loss and can even prove lethal for the person.

Q1 How exchange of gases take place in plants?

Q2 Differentiate between photosynthesis and respiration.

Q3 Explain the mechanism of breathing in human beings.

Q4 How does water rise in tall trees?

Q5 Leaves of a potted plant are coated with Vaseline to block the stomata. Will this plant remain healthy for long? State the 3 reasons for your answer.

Q6 How is prepared food transported to different parts of the plant?

Q7 What is blood? What are the components of blood? Also write the function of each component.

Q8 What are the advantages of having very thin and highly branched capillaries for blood flow?

Q9 What is the difference between the blood flowing in the arteries and that flowing in the veins?

Q10 What is the meaning of the term “Double circulation”?

Q11 What will happen if excess bleeding takes place and what natural device preventing it?

Q12 Correct the false statement

  a) The walls of the atrium are thicker than the ventricles

  b) The oxygen carrying blood goes into the left auricle

  c) Valves open on both the sides.

  d) Xylem transports food material.

  e) The blood circulation in man is of open type in man

Q13 Differentiate between excretion ands osmoregulation? Describe how excretion takes place in amoeba.

Q14 What is dialysis? How is it useful?

Q15 What is excretion? How is solid and gaseous waste excreted in humans?

Q16 List the functions of blood.

Class 10 Science Life Process Notes and Questions

Question: Where do plants get each of the raw materials required for photosynthesis?
Ans. (a) Carbon dioxide from atmosphere.
(b) Light from Sun
(c) Water from Soil
(d) Chlorophyll from chloroplast of green plants.

Question: Why is it necessary to separate oxygenated and deoxygenated blood in mammals and birds?
Ans. The separation of the right and left side of heart is useful to prevent oxygenated blood and deoxygenated blood from mixing. Such separation allows a highly efficient supply of oxygen to the body. This is useful in animals that have high energy needs, such as birds and mammals that constantly use the energy to maintain their body temperature.

Question: What are the methods used by plants to get rid of excretory products?
Ans. (i) Plant produces carbon dioxide as wastes during respiration and oxygen as waste during photosynthesis.
(ii) Excess of water is removed through transpiration.
(iii) Some waste products like gums and resins are stored in older xylem tissue.

Question: How is amount of urine produced regulated?
Ans. The amount of urine depends on how much excess of water is in the body and how much a water soluble waste is to be excreted. If the amount of water and dissolved wastes in boy are more than amount of urine will be more and if amount of wastes is less the amount of urine produced will be less.

Question: With the help of diagram, show pulmonary circulation in man.
Ans. Diagram – Pulmonary circulation in man.

Question: Discuss the major steps involved in process of nutrition in human beings.
Ans. Major steps involved in human nutrition are –
a) Ingestion – Intake of food through mouth. Humans have holozoic mode of nutrition. They engulf solid particles.
b) Digestion – The break down complex food material into simpler one in alimentary canal with the help of mechanical as well as chemical process.
c) Absorption – Digested food is absorbed by the small finger like projections, villi present in the small intestine.
d) Assimilation – Absorbed food reaches to all cells via blood, and utilized for energy, growth and development.
e) Excretion – Undigested food from small intestine passed into large intestine, and then it is thrown out by Anus.

Question: Give an experiment to prove the essentiality of light for photosynthesis
Ans. a) Destarched the plant by leaving it in dart for 48 – 72 hours.
b) Now place strips of black paper or metal foil over destarched leaves and expose them to light for several hours.

Question: Why and how does water enter continuously into the root xylem of plants?
Ans. Xylem transports water and minerals to the plant body. The roots of a plant have hair called root hairs. The root hairs are directly in contact with the flam of water in between the soil particles. Water and minerals get into the root hair by the process of diffusion. The water and minerals absorbed by the root hair form the soil pass from cell to cell by osmosis through the epidermis root cortex, endodermis and reaches the root xylem. The xylem vessels of the root the plant are connected to the xylem vessels into stem. Therefore, the water containing dissolved minerals enter the root xylem vessels into stem xylem vessels. The xylem vessels of the stem branch into the leaves of the plants. So the water & minerals carried by the xylem vessels in the stem reach the leaves through the branched xylem vessels which enter from the petiole into the each part of the leaf. Thus the water and minerals form the soil reach through the root and stem to the leaves of the plants. Evaporation of water molecules from the cells of a leaf creates a suction which pulls water form the xylem cells of roots. The loss of water in the form of vapour from the aerial parts of the plants is known as transpiration.

Question: What are outside raw materials used for by an organism?
Ans. Outside raw materials used for by an organism includes:
a. Food
b. Water
c. Oxygen

Question: What are the functions of human respiratory system?
Ans. (i) Gaseous exchange for the cellular respiratory process.
(ii) Sound production by vocal cords
(iii)Abdominal compression which helps in urination, passing of faces and childbirth.
(iv) Laughing and sneezing for self-cleaning the respiratory surface.

Question: What processes would you consider essential for maintaining life?
Ans. The processes essential for maintaining life are
a. Nutrition
b. Respiration
c. Transportation
d. Excretion

Question: How respiration does takes place in plants?
Ans. There are three modes for the exchange of gases in plants –
a) Some small plants can carry out gaseous exchange by simple diffusion over their whole surfaces.
b) Large fowering plants exchange gases through stomata on their leaves and green stem.
c) In woody stems, exchange occurs through cracks in the bark or lenticels.

Question: Explain the structure of chloroplast.
Ans. Fig – structure of chloroplast.

Question: What are difference between autotrophic and heterotrophic nutrition?
Ans. Distinction between autotrophic and heterotrophic nutrition:

Question: What is the role of the acids in our stomach?
Ans. HCl plays following role in our stomach:
(a) Make the medium acidic for action of enzyme pepsin.
(b) Kills the harmful bacteria present in food
(c) Prevents fermentation of food

Question: What advantage over an aquatic organism does a terrestrial organism have with regard to obtaining oxygen for respiration?
Ans. The rate of breathing is slower in terrestrial organisms as compared to aquatic organisms. This is due to the fact that in water, the amount of oxygen is less as compared to air while in aquatic organisms the rate of breathing is faster.

Question: How is food transported in plants?
Ans. Food is transported in plants through phloem which consists of sieve tubes, sieve cells and companion cells. The food prepared in leaves in soluble form transported to leaves phloem. Active transport of food passes to all other parts of plants.

Question: What are different ways in which glucose is oxidized to provide energy in various organisms?
Ans. The pathways of break-down of glucose in various organisms are as below:

Question: What is the role of following in human digestive system –
a) mucous
b) Bicarbonate
c) Trypsin
Ans. a) Mucus – It protects the inner living of stomach from HCl.
b) Bricarbonate – It makes the acidic food alkaline so that pancreatic enzymes act on it.
c) Trypsin – It digest proteins into amino acids.

Question: How is oxygen and carbon dioxide transported in human beings?
Ans. In human beings, a pigment hemoglobin is present in RBC which has high affinity for oxygen, takes up the oxygen from the air in the lungs and carry it to tissues which are deficient in oxygen. Some oxygen is carried in dissolved state in blood plasma. Carbon dioxide is more soluble in water than oxygen is mostly transported in the dissolved form in our blood.

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