Class 10 Science Chapter 6 Life Processes The answer to each chapter is provided in the list so that you can easily browse throughout different chapters NCERT Class 10 Science Chapter 6 Life Processes and select need one.
Class 10 Science Chapter 6 Life Processes
Also, you can read the SCERT book online in these sections Solutions by Expert Teachers as per SCERT (CBSE) Book guidelines. These solutions are part of SCERT All Subject Solutions. Here we have given Assam Board Class 10 Science Chapter 6 Life Processes Solutions for All Subjects, You can practice these here…
Q.20. What are villi and what is their function ?
Ans :- Villi are the fingers like structures present on the inner surface of the small intestines . About five millions of villi are present in the intestine thus they increase the absorptive surface of the intestine considerably and facilitate quick absorption of the digested food , Each villus contains a network of blood capillaries with a central lacteal vessel.
Q.21. What are the functions of pancreas in the human body ?
Ans :- Pancreas secretes pancreas juice . The pancreatic juice contains digestive enzymes . The trypsin enzyme for digesting proteins , pancreatic amylose for breakdown of starch and pancreatic lipase to digest fats . Pancreas also secrete hormones , known as insulin and glucagon .
Q.22. What are villi and what is their function ?
Ans :- Villi are the fingers like structures present on the inner surface of the small intestines . About five millions of villi are present in the intestine thus they increase the absorptive surface of the intestine considerably and facilitate quick absorption of the digested food . Each villi contains a network of blood capillaries with a central lacteal vessel .
Q.23. What are the functions of pancreas in the human body ?
Ans :- Pancreas secretes pancreas juice . The pancreatic juice contains digestive enzymes . The trypsin enzyme for digesting proteins , pancreatic amylase for breakdown of starch and pancreatic lipase to digest fats . Pancreas also secrete hormones , known as insulin and glucagon .
Q.24. Photosynthesis is called a light dependent process . comment .
Ans :- As the process of photosynthesis occurs only in the presence of light , it is called a light dependent process .
Q.25. Differentiate chloroplast and chlorophyll .
Ans :-
| Chloroplast | Chlorophyll |
| 1. It is a organelle of cell. | 1. It is green pigment of chloroplast. |
| 2. It is living. | 2. It is non – living. |
Q.26. Give an account of small intestine.
Ans :- It is the longest part of alimentary canal . If is thin walled and highly coiled tubular structure . It is about 3-3.5 meters long and occupies most part of abdominal cavity . It is coiled upon itself .
The inner wall of small intestine is thrown into many finger like processes called villi . These villi increase the surface area for absorption
Q.27. What is respiratory pigment ?
Ans :- A respiratory pigment is a chemical substance which can combine with oxygen in lungs where the partial pressure of oxygen is more and releases oxygen in the tissue where partial pressure of oxygen is less .
Q.28. Why are mitochondria known as ‘ power house of the cell ?
Ans :- Mitochondria carry out all the oxidation reaction of respiration and yield energy . They have a number of enzymes to carry out energy giving reactions . So , they are known as power house of the cell .
Q.29. Define breathing .
Ans :- The mechanism by which organisms obtain oxygen from the environment and release carbon dioxide is called breathing .
Q.30. List the four major components of blood .
Ans :- ( i ) RBC.
( ii ) WBC.
( iii ) Thrombocytes.
( iv ) Plasma.
Q.31. How does Lymph formed ?
Ans :- Through the pores present in the walls of blood capillaries , blood cell like white blood cells , plasma , some proteins and salts . This fluid forms lymph or tissue fluid .
Q.32. Name the four chambers of heart .
Ans :- ( i ) Left ventricles.
( ii ) Right ventricles.
( iii ) Left Atrium.
( iv ) Right Atrium.
Q.33. What is blood ? Describe its composition .
Ans :- Blood is a fluid . It is a connective tissue . Blood contains the following components :-
( i ) Plasma :- It is a fluid matrix . It is colourless and contains a lot of water , many proteins and salt .
( ii ) RBC :- Blood looks red because of the red coloured pigment haemoglobin present in the Red Blood Cells .
( iii ) WBC :- These are lesser in number than the RBC . They are white or colourless cells . They protect us from infection .
( iv ) Blood platelets :- Blood platelets are fragments of cells and they do not possess nuclei . They help in clotting of blood .
Q.34. What is diffusion ?
Ans :- The movement of the molecules of gases , liquids, and solulis from the region of higher concentration to the region of lower concentration is known as diffusion .
Q.35. What is osmosis ?
Ans :- Osmosis is special type of diffusion of a liquid , when solvent moves through a semipermeable membrane from a place of higher diffusion pressure to a place of lower diffusion pressure .
Q.36. What are the functions of kidneys ?
Ans :- Function of kidneys :-
( i ) To separate urea and other waste products from the blood and to form the urine .
( ii ) It also removes the excess of salt .
( iii ) To maintain the water – salt balance of the body .
( iv ) To maintain the internal concentration .
Q.37. Name the two kinds of cells of xylem .
Ans :- ( i ) Tracheids.
( ii ) Vessels.
Q.38. What is the full form of ATP .
Ans :- A denosine triphosphate .
Q.39. What do the following transport ?
( i ) Xylem.
( ii ) Phloem.
( iii ) Pulmonary Vein.
( iv ) Vena Cava .
Ans :- ( i ) Transports water and dissolved minerals in plants .
( ii ) Transports prepared food in plants .
( iii ) Transports oxygenated blood from lungs to left – ventricle of hearts .
( iv ) Transports deoxygenated blood from body to right ventricle .
Q.40. Explain the importance of soil for plant growth .
Ans :- Importance of soil for plant growths .
( i ) Soil lallows fixing of plant .
( ii ) Soil is the source of water and minerals .
( iii ) Soil air malus available oxygen for respiration to root cell .
Q.41 . List three differences between respiration in plants and respiration in animals .
Ans :-
| Respiration in plants | Respiration in animals |
| 1. All the cells of plant parts perform the respiration individually . | 1. It is performed by specific respiratory organs for all the cells of body. |
| 2. There is a little transport of gases is gases from one past the other . | 2. Transport of gases is maximum. |
| 3. Rate of respiration is low . | 3. Rate of respiration is hight . |
Q.42. State the functions of blood .
Ans :- ( i ) Blood supplies nutrients and oxygen to various organs and cells of the body .
( ii ) It carries the waste matter formed in the cells to the excretory organs .
( iii ) It regulates the temperature of the body .
( iv ) It supplies hormones to different parts of the body .
Q.43. Match the words of column A with colum B.
| Cluman A | Column B |
| ( a ) Phloem | ( i ) Excretion |
| ( b ) Nephron | ( ii ) Translocation of food |
| ( c ) Veins | ( iii ) Clotting of blood |
| ( d ) Platelets | ( iv ) Deoxygenated blood |
Ans :-
| Cluman A | Column B |
| ( a ) Phloem | ( ii ) Translocation of food |
| ( b ) Nephron | ( i ) Excretion |
| ( c ) Veins | ( iv ) Deoxygenated blood |
| ( d ) Platelets | ( iii ) Clotting of blood |
Q.44. Why is transpiration important for plants ?
Ans :- Importance of transpiration :+
( i ) Transpiration helps in absorption of water from soil .
( ii ) It helps in absorption and conduction of minarels also .
( iii ) By its cooking effect it – maintains temperature also.
Q.45. What are artificial kidneys ? How do they work ?
Ans :- An artificial kidney is a device to remove nitrogenous waste products from the blood through dialysis . Artificial kidneys contain a number of tabes with a semi – permeable lining , suspended in a tank filled with dialysing fluid . This fluid has the same osmotic pressure as blood , except that it is devoid of nitrogenous wastes . The patient’s blood is passed through these tubes . During this passage , the waste products from the blood pass into dialysing fluid by diffusion . The purified blood is pumped back into the patient . This is similar to the function of the kidney , but it is different since there is no re – absorption involved .
Q.46. Which parts are include in human excretory system ?
Ans :- ( i ) a pair of kidneys.
( ii ) a pair of ureters.
( iii ) a urinary bladder.
( iv ) a urethra.
Q.47. Define excretion.
Ans :- The biological process involved in the removal of the excess of water, salts and toxic wastes from the body is called excretion.
Multiple-choice questions
Q.1. The green color of plants is due to the presence of
( a ) Chlorophyll.
( b ) Carotene.
( c ) Xanthophyll.
( d ) Starch.
Ans :- (a) Chlorophyll.
Q.2. Saliva contains :
( a ) Renvin.
( b ) Pepsin.
( c ) Ptyalin.
( d ) Trypsin.
Ans :- ( c ) Ptyalin.
Q.3. The first step of break down of glucose takes place in
( a ) Nucleus.
( b ) Mitochondria.
( c ) Cytoplasm.
( d ) Lysosomes.
Ans :- (c) Cytoplasm.
Q.4. Water absorption by roots is under the influence of
( a ) Evaporation pull.
( b ) Transpiration pull.
( c ) Soil air.
( d ) Availability of soil water.
Ans :- ( d ) Availability of soil water.
Q.5. Which is end product of glycolysis ?
( a ) Pyruvic acid.
( b ) Acetyl Co A.
( c) Lactic acid.
( d ) Citric acid.
Ans :- ( a ) Pyruvic acid.
Q.6. Functional unit in kidney is –
( a ) Nephron.
( b ) Nephritis.
( c ) Neuron.
( d ) Loop of Henle.
Ans :- ( a ) Nephron.
Q.7. The conversion of proteins waste , the ammonia into urea occurs mainly is
( a ) Liver.
( b ) kidney.
( c ) Lungs.
( d ) Intestine.
Ans :- ( a ) Liver.
Q.8. The chemical process that causes digestion of food by enzymes is called
( a ) Dehydration.
( b ) Hydration.
( c ) Hydrolyses.
( d ) Oxidations.
Ans :- ( c ) Hydrolyses .
Q.9. Major function of Hcl of gastric juice is
( a ) Providing acidic medium for pepsin.
( b ) Facilitates absorption of food.
( c ) kills microorganisms.
( d ) ( a ) and ( c )
Ans :- ( d ) ( a ) and ( c )
Q.10. Urea formation takes place in
( a ) Liver.
( b ) kidney.
( c ) Lungs.
( d ) Skin.
Ans :- ( a ) Liver.
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