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Class 10 Chemistry Chapter 25 Biochemistry Class Test 6 PDF Download
10th class Chemistry 2nd Half Unit test Chapter 25
Prepare for your upcoming examinations with the Class 10 Chemistry Chapter 25 Biochemistry Class Test 6 PDF, designed according to the Punjab Board 2027 Model Papers and the new syllabus issued by PECTAA Punjab. This chapter-wise test series covers Topics 25.4 to 25.7 from Chapter 25: Biochemistry. Students can use this Chemistry test to revise important concepts, practise exam-style questions, and assess their preparation according to the updated Class 10 Chemistry syllabus. Download the test paper in PDF format and improve your preparation for the Punjab Boards examinations 2027.
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Chapter Wise Class Test
Test 6
Chapter-25
Biochemistry
1.Fatty acids are long chain of:
(a) carboxylic acid(b) alcohol(c) aldehyde(d) ketone
Answer: (a) carboxylic acid
2.Animal fats are located in tissue cells:
(a) nerve cell(b) adipose cell(c) brain cells(d) muscle cell
Answer: (b) adipose cell
3.The cleaning properties of soap did not become widespread until:
(a) 15th century(b) 17th century(c) 18th century(d) 20th century
Answer: (c) 18th century
4.Vitamin C is also called:
(a) oleic acid(b) lauric acid(c) ascorbic acid(d) scurvy
Answer: (c) ascorbic acid
5.Carbohydrates, proteins, fats and water make together constitute the living organism:
(a) 90%(b) 95%(c) 97%(d) 99%
Answer: (d) 99%
6.Length of DNA molecule is:
(a) 10cm(b) 11cm(c) 12cm(d) 14cm
Answer: (c) 12cm (verify with your textbook)
7.Pregnancy can be detected by testing:
(a) saliva(b) urine on blood(c) sweat(d) mucous
Answer: (b) urine (or blood), by detecting the hormone hCG
8.In gene therapy, defective genes are replaced by:
(a) healthy gene(b) protein(c) bone(d) chemicals
Answer: (a) healthy gene
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Chapter Wise Class Test
Test 6
Chapter-25
Biochemistry
2. Write short answers to any six (6) questions.
[6 × 2 = 12]
- (i)Write the sources and structure of stearic acid and palmitic acid.Stearic acid (C17H35COOH): saturated fatty acid with 18 carbons; sources: animal fats (beef tallow), cocoa butter, shea butter.
Palmitic acid (C15H31COOH): saturated fatty acid with 16 carbons; sources: palm oil, animal fats, butter.Stearic acid: CH3(CH2)16COOH
Palmitic acid: CH3(CH2)14COOH
- (ii)What is soap? How was prepared in ancient times?Soap is the sodium or potassium salt of a long-chain fatty acid (e.g. C17H35COONa). In ancient times it was prepared by boiling animal fat (tallow) with wood ash (a source of potash, an alkali) and water.
- (iii)How can our body obtain Vitamin D?From sunlight (the skin makes vitamin D when exposed to UV rays), and from foods such as fish liver oil, egg yolk, milk, butter and fortified foods.
- (iv)How is DNA different from RNA?DNA: double-stranded, contains deoxyribose sugar, bases A, T, G, C, stores genetic information. RNA: single-stranded, contains ribose sugar, bases A, U, G, C (uracil instead of thymine), helps in protein synthesis.
- (v)How mass of polymer can measure?Molar mass of a polymer can be measured by methods such as osmometry, viscometry, light scattering, gel permeation chromatography (GPC) and mass spectrometry.
- (vi)What is genetic testing?A test of a person’s DNA (from blood, saliva or tissue) to find changes (mutations) in genes that may cause genetic disorders or increase the risk of a disease.
- (vii)What is gene therapy?A technique to treat or prevent genetic disease by replacing a defective gene with a healthy gene in the patient’s cells.
- (viii)What is the role of lipids in our body?Lipids store and supply energy, insulate the body, protect internal organs, form cell membranes, help make hormones and carry fat-soluble vitamins (A, D, E, K).
- (ix)What is the function of RNA?RNA carries the genetic message from DNA and helps to make proteins (mRNA carries the code, tRNA brings amino acids, rRNA forms ribosomes).
Note: Attempt any one question.
[5 × 1 = 5]
3.
What are vitamins? Write its importance (Source and Disease due to deficiency of vitamins).
Vitamins: organic compounds needed in small amounts for normal growth, health and body functions.
A – carrots, liver, milk → night blindness
B-complex – whole grains, meat, eggs → beri-beri
C (ascorbic acid) – citrus fruits, guava → scurvy
D – sunlight, fish oil, eggs → rickets
E – vegetable oils, nuts → weak muscles / fertility problems
K – green vegetables → delayed blood clotting
A – carrots, liver, milk → night blindness
B-complex – whole grains, meat, eggs → beri-beri
C (ascorbic acid) – citrus fruits, guava → scurvy
D – sunlight, fish oil, eggs → rickets
E – vegetable oils, nuts → weak muscles / fertility problems
K – green vegetables → delayed blood clotting
4.
Write applications of Biochemistry.
Medicine (diagnosis, drugs, vaccines, insulin), genetic testing and gene therapy, forensic science (DNA fingerprinting), agriculture (fertilizers, pesticides, improved crops), food and nutrition, industry (soap, fermentation, enzymes, biofuels) and environmental protection.
