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Class 10 Chemistry Chapter 25 Biochemistry Class Test 5 PDF | Punjab Board 2027 Model Papers
Chemistry class 10 Chapter 25 Test Topics 5 25.1 to 25.3
Prepare for your Class 10 Chemistry Chapter 25: Biochemistry Class Test 5 with the latest Punjab Board 2027 Model Papers. This chapter-wise test covers Topics 25.1 to 25.3 according to the new Chemistry syllabus issued by PECTAA Punjab. Students can use this Class 10 Chemistry test to revise important concepts, assess their preparation, and practise for upcoming board examinations. This test is part of our Class 10 Chemistry Chapter Wise Test Series, designed to support effective exam preparation under the updated Punjab Board syllabus.
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Chapter Wise Class Test
Test 5
Chapter-25
Biochemistry
1.There are main classes of food:
(a) 2(b) 3(c) 4(d) 5
Answer: (d) 5
2.Main energy source of human body is:
(a) carbohydrates(b) proteins(c) vitamin(d) lipid
Answer: (a) carbohydrates
3.Reduce intake of saturated fats, sugar and:
(a) potassium(b) sodium(c) calcium(d) magnesium
Answer: (b) sodium
4.Carbohydrates can be classified into groups.
(a) 3(b) 4(c) 5(d) many
Answer: (a) 3 (monosaccharides, oligosaccharides, polysaccharides)
5.Source of cellulose materials is:
(a) food(b) rice(c) plant(d) grapes
Answer: (c) plant
6.Which one of following widely used in baking?
(a) glucose(b) lactose(c) sucrose(d) starch
Answer: (c) sucrose
7.Which protein is responsible carrying oxygen in blood?
(a) insulin(b) keratin(c) hemoglobin(d) enzyme
Answer: (c) hemoglobin
8.Attack by oxidizing or reducing agents in protein cause:
(a) denaturation(b) polymerization(c) hydrolysis(d) neutralization
Answer: (a) denaturation
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Chapter Wise Class Test
Test 5
Chapter-25
Biochemistry
2. Write short answers to any six (6) questions.
[6 × 2 = 12]
- (i)Define Biochemistry.The branch of chemistry which deals with the study of chemical substances and chemical processes (reactions) occurring in living organisms.
- (ii)What is Nutrient? Give an example.A nutrient is a chemical substance in food that is needed by the body for energy, growth, repair and regulation of body processes. Example: carbohydrates (also proteins, lipids, vitamins, minerals).
- (iii)Write the function of lipids and their daily requirement.Function: lipids are a concentrated source of energy, store energy, insulate the body, protect organs and carry fat-soluble vitamins (A, D, E, K). Daily requirement: about 20–35% of total daily calories (check your textbook value).
- (iv)Write the source and application of glucose.Source: fruits (grapes, dates), honey, sugarcane, vegetables, and starch hydrolysis. Application: main energy source of the body; used in glucose drips (IV), energy drinks and sweets.
- (v)What is acesulfame potassium?An artificial (non-nutritive) sweetener, about 200 times sweeter than sucrose, with almost no calories; used in diet drinks and sugar-free foods.
- (vi)What is amino acid? Give example.An organic compound containing both an amino group (–NH2) and a carboxyl group (–COOH); it is the building unit of proteins. Example: glycine, alanine.
- (vii)What is polypeptide?A long chain of many amino acids joined together by peptide bonds (–CO–NH–).
- (viii)Are all carbohydrates equally beneficial for our health?No. Complex carbohydrates with fibre (whole grains, vegetables, fruits) are beneficial, while refined sugars and processed carbohydrates give quick energy but can cause obesity and diabetes.
- (ix)Why do children need a large amount of protein?Because children are growing rapidly; proteins are needed for building new tissues, muscles, enzymes and hormones, and for repair of cells.
Note: Attempt any one question.
[5 × 1 = 5]
3.
What are carbohydrates? Describe their classification with examples.
Definition: Polyhydroxy aldehydes or ketones (or compounds giving them on hydrolysis), general formula Cx(H2O)y.
Classification:
1) Monosaccharides – simple sugars, cannot be hydrolysed (glucose, fructose, galactose).
2) Oligosaccharides – 2 to 10 monosaccharide units (sucrose, lactose, maltose).
3) Polysaccharides – many monosaccharide units (starch, cellulose, glycogen).
Classification:
1) Monosaccharides – simple sugars, cannot be hydrolysed (glucose, fructose, galactose).
2) Oligosaccharides – 2 to 10 monosaccharide units (sucrose, lactose, maltose).
3) Polysaccharides – many monosaccharide units (starch, cellulose, glycogen).
4.
What do you know about Proteins and amino acid?
Proteins: Large biomolecules made of amino acids joined by peptide bonds; they are needed for growth, repair, enzymes, hormones and carrying oxygen (hemoglobin). Sources: meat, fish, eggs, milk, pulses.
Amino acids: Organic compounds with –NH2 and –COOH groups; about 20 amino acids form proteins. Peptide bond formation gives dipeptides, tripeptides and polypeptides. Denaturation occurs by heat, acids, oxidizing or reducing agents.
Amino acids: Organic compounds with –NH2 and –COOH groups; about 20 amino acids form proteins. Peptide bond formation gives dipeptides, tripeptides and polypeptides. Denaturation occurs by heat, acids, oxidizing or reducing agents.
