Prepare for your Class 10 Chemistry Chapter 25: Biochemistry Class Test 7 with our Punjab Board 2027 Model Papers. This chapter-wise test is designed according to the new syllabus issued by PECTAA Punjab to help students revise important concepts, practice exam-style questions, and prepare effectively for their upcoming board examinations. Download the Class 10 Chemistry Biochemistry test PDF and use it for self-assessment, classroom practice, and exam preparation. This resource is part of our Class 10 Chemistry Chapter Wise Test Series and includes a Full Unit Model Paper for comprehensive revision.
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PAPER NO.
07
CHAPTER
WISE
WISE
Roll No.(in Figures):
(in Words):
Chapter 25:
Maximum Marks: 12
Biochemistry
OBJECTIVE TYPE
Time Allowed : 15 Minutes
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ABCDNOTE:Four possible answers A, B, C and D to each question are given. The choice which you think is correct, fill that circle in front of that question with Marker or Pen ink. Cutting or filling two or more circles will result in zero mark in that question.
Q1.12
1.Functional groups present in fructose are:
(A)Hydroxyl and aldehyde(B)Hydroxyl and Ketone(C)Hydroxyl and ester(D)Hydroxyl and amide
2.A daily intake of fats for an adult is roughly between:
(A)10-30 g(B)44-78 g(C)100-150 g(D)200-250 g
3.Which functional group is present in a fat?
(A)Carboxyl group(B)Ester group(C)Carbonyl group(D)Hydroxyl group
4.Maltose is found in:
(A)Milk and meat(B)Fruits and vegetables(C)Breads and other cereals(D)Sugar cane only
5.Which function is not performed by proteins in our body?
(A)They serve as chemical messengers.(B)They serve as storage of energy-rich fuel.(C)They store genetic information.(D)They serve as catalysts for biochemical reactions.
6.Stearic acid is found in:
(A)Coconut oil(B)Animal fats(C)Palm oil(D)Olive oil
7.Which functional groups react to produce a peptide linkage in proteins?
(A)Carboxyl group and hydroxyl group(B)Carboxyl group and amino group(C)Hydroxyl group and amino group(D)Ester group and amino group
8.Lipids mainly serve as energy rich source in:
(A)Plants only,(B)Bacteria only(C)Animals(D)Fungi only
9.The test performed to detect cancer in early stages is:
(A)Genetic test(B)Urine test(C)Galleri test(D)Electrolyte test
10.Deficiency of Vitamin A1 leads to:
(A)Scurvy(B)Rickets(C)Night blindness(D)Fatigue and depression
11.Fatigue and depression are caused by deficiency of:
(A)Vitamin A(B)Vitamin C(C)Vitamin D(D)Vitamin B1
12.Genetic tests are performed by taking a sample of:
(A)Urine only(B)Hair only(C)Blood or saliva(D)Sweat only
Here is Subjective Part of Paper.
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Roll No.(in Figures):
(in Words):
Chapter 25:
Biochemistry
Biochemistry
SUBJECTIVE TYPE
(PART – I)
(PART – I)
Maximum Marks: 48
Time Allowed :1.45 Hours
Time Allowed :1.45 Hours
Q2.Write short answers to any FIVE (5) questions:(5×2=10)
- (i)What is the difference between glucose and fructose?Glucose is an aldohexose (has an aldehyde group, –CHO, at C-1); fructose is a ketohexose (has a ketone group, >C=O, at C-2). Both have the formula C6H12O6, but fructose is sweeter than glucose.
- (ii)Write name of three classes of foods that provide energy?Carbohydrates, fats (lipids) and proteins.
- (iii)Give two examples of denaturation of proteins:1) Cooking / boiling an egg – heat changes the soluble egg-white protein into a white solid.
2) Curdling of milk by acid (lemon juice or lactic acid) – milk protein casein coagulates. - (iv)What is the role of carbohydrates in our body?Carbohydrates are the main source of energy (about 4 kcal per gram); excess is stored as glycogen in liver and muscles; fibre (cellulose) helps digestion.
- (v)What are the sources of vitamin D?Sunlight (the skin makes vitamin D), fish liver oil, egg yolk, milk, butter, and fortified foods.
- (vi)What is the role of vitamins and minerals?Vitamins regulate metabolism, growth and immunity and help enzymes work. Minerals build bones and teeth (Ca, P), make hemoglobin (Fe), and control nerve function and body fluids (Na, K).
- (vii)What is the role of enzymes in our body?Enzymes are protein catalysts that speed up biochemical reactions (such as digestion) by lowering the activation energy, without being used up.
- (viii)Why should we avoid eating processed and poor quality foods?They contain excess sugar, salt, saturated fat and chemical additives but few nutrients, and can cause obesity, diabetes, high blood pressure, heart disease and weak immunity.
Q3.Write short answers to any FIVE (5) questions:(5×2=10)
- (i)Which commercial products are obtained from oils and fats?Soaps, detergents, candles, margarine (vegetable ghee), glycerol, paints, cosmetics and biodiesel.
- (ii)What is glucose and where is it found?Glucose (C6H12O6) is a simple sugar (monosaccharide) and the body’s main fuel. It is found in grapes and other fruits, honey, vegetables and in blood.
- (iii)Which vitamin helps in blood clotting?Vitamin K.
- (iv)What is lactose and where is it found?Lactose is a disaccharide made of glucose + galactose (milk sugar). It is found in the milk of mammals and milk products.
- (v)What is the function of DNA?DNA stores the genetic information, passes it from parents to offspring, and directs protein synthesis (through RNA).
- (vi)What are amino acids?Organic compounds that contain an amino group (–NH2) and a carboxyl group (–COOH); they are the building blocks of proteins.
- (vii)Write down three important functions played by proteins in our body.1) Growth and repair of tissues. 2) Act as enzymes (catalysts). 3) Transport oxygen (hemoglobin). (Also antibodies and hormones.)
- (viii)What is a polypeptide?A long chain of many amino acids joined together by peptide bonds (–CO–NH–).
Q4.Write short answers to any FIVE (5) questions:(5×2=10)
- (i)Why do children need more proteins?Children are growing rapidly, so they need more proteins to build new cells, muscles, bones, enzymes and hormones.
- (ii)Fatty acids serve as building blocks of lipids just like amino acids are for proteins. Comment on this statement.Partly true. Fatty acids combine with glycerol (ester linkage) to form fats and oils (triglycerides), just as amino acids combine through peptide bonds to form proteins. But lipids are not true polymers: fatty acids do not join in a long repeating chain like amino acids do.
- (iii)What is tristearin?A triglyceride (fat) formed from glycerol and three molecules of stearic acid: (C17H35COO)3C3H5. It is a solid fat found in animal fats.
- (iv)What is the source of butter and ghee?Milk of cows and buffaloes. Butter is churned from cream, and ghee is obtained by heating butter.
- (v)Which diseases are caused by deficiency of vitamin D?Rickets in children and osteomalacia (soft, weak bones) in adults.
- (vi)Why are vitamins called vital amines?The first vitamin discovered was thought to contain an amine group and is vital (essential) for life, so Funk called them “vital amines”. (Later it was found that not all vitamins are amines.)
- (vii)Write down the names of two polymeric carbohydrates.Starch and cellulose (also glycogen).
- (viii)What are the basic differences between DNA and RNA?
DNA RNA Double-stranded helix Single-stranded Sugar: deoxyribose Sugar: ribose Bases: A, T, G, C Bases: A, U, G, C Stores genetic information Helps in protein synthesis
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Both have the molecular formula C6H12O6. Glucose has an aldehyde group (–CHO) at C-1; fructose has a ketone group (>C=O) at C-2.
Peptide linkage: the amide bond (–CO–NH–) formed when the carboxyl group of one amino acid reacts with the amino group of another, with loss of water.
Structure of a polypeptide: many amino acids are joined in a chain: –NH–CHR–CO–NH–CHR′–CO–NH–CHR″–CO–.
(PART – II)
Note: Attempt any TWO questions.(2 × 9 = 18)
Q5.(a)What are the sources of fructose, maltose and lactose?5
Fructose: fruits (apple, mango, grapes) and honey. Maltose: germinating grains (malt), bread and other cereals. Lactose: milk of mammals and milk products.
(b)Write a note on the importance of nutrition?4
Nutrition supplies energy, supports growth and repair of tissues, builds immunity and protects against disease (deficiency diseases and obesity), and supports mental development. A balanced diet needs carbohydrates, proteins, fats, vitamins, minerals and water in the correct amounts.
Q6.(a)Draw open chain structures of glucose and fructose.5
D-Glucose (aldohexose)
D-Fructose (ketohexose)
(b)What are proteins? How are they formed? Identify different functions of proteins in the human body.4
Proteins: large biomolecules (polymers) made of many amino acids.
Formation: the –COOH group of one amino acid reacts with the –NH2 group of the next, losing a molecule of water (condensation) and forming a peptide bond (–CO–NH–). Many amino acids join to make polypeptides, which fold into proteins.
Functions:
Formation: the –COOH group of one amino acid reacts with the –NH2 group of the next, losing a molecule of water (condensation) and forming a peptide bond (–CO–NH–). Many amino acids join to make polypeptides, which fold into proteins.
Functions:
- Growth and repair of body tissues
- Enzymes (biological catalysts)
- Hormones (chemical messengers, e.g. insulin)
- Transport of oxygen (hemoglobin)
- Antibodies for defence against disease
- Structural proteins (keratin in hair and nails)
Q7.(a)Construct peptide linkage and explain the structure of a polypeptide.5
Peptide linkage (glycine + alanine)
Structure of a polypeptide: many amino acids are joined in a chain: –NH–CHR–CO–NH–CHR′–CO–NH–CHR″–CO–.
- Primary: the sequence of amino acids in the chain.
- Secondary: coiling (α-helix) or folding (β-pleated sheet) held by hydrogen bonds.
- Tertiary: further 3-D folding of the whole chain.
- Quaternary: several polypeptide chains joined together (e.g. hemoglobin).
(b)What are DNA and RNA? Describe the role played by them in our body.4
DNA (deoxyribonucleic acid) and RNA (ribonucleic acid) are nucleic acids, polymers of nucleotides (sugar + phosphate + nitrogen base).
DNA: double-stranded helix; stores the genetic information, passes characters from parents to children, and carries the code for making proteins.
RNA: single-stranded; copies the message from DNA and helps make proteins – mRNA carries the code, tRNA brings amino acids, rRNA forms ribosomes.
DNA: double-stranded helix; stores the genetic information, passes characters from parents to children, and carries the code for making proteins.
RNA: single-stranded; copies the message from DNA and helps make proteins – mRNA carries the code, tRNA brings amino acids, rRNA forms ribosomes.
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