YEAR 2023
1.
[1]
2.
[1]
3.
4. On hydrolysis, which of the following carbohydrates gives glucose and fructose ?
(a) Sucrose (b) Starch (c) Lactose (d) Maltose [1]
5. The deficiency of which of the following vitamins causes Scurvy? (a) Vitamin AA (b) Vitamin
B6 (c) Vitamin C d) Vitamin B12 [1]
6.
[1]
7.
(a) Write chemical reaction to show that open structure of D-glucose contains the straight
chain. (b) What type of linkage is responsible for the formation of protein ? [2]
8.
9.
YEAR 2021
10. The helix structure of protiens is stabilized by:
(a) Peptide bond (b) H-Bond (c) Di-sulphide bond (d) Varderwals bond [1]
11. Nuclic acids are polymers of:
(a) Nucleosides (b) D-Ribose (c) Amino acids (d) Nucleotides. [1]
12. Assertion: Glucose I reducing sugar.
Reason: Despite aving an aldehyde group glucose does not give 2,4-DNP test. [1]
13. (a) Differentiate the following:
(i) Fibrous protein & Globular protein
(ii) Essential amino acids & non-essential amino acids
(iii) DNA & RNA.
OR
(b) Write the reaction of Glucose with:
(i) HCN (ii) Br2 (iii) HI. [3]
YEAR 2020
14. Assertion (A) : Sucrose is a non-reducing sugar.
Reason (R) : Sucrose has glycosidic linkage.
15. Give the plausible explanation for the following : 13=3
(a) Glucose doesn’t give 2,4-DNP test.
(b) The two strands in DNA are not identical but are complementary.
(c) Starch and cellulose both contain glucose unit as monomer, yet they are structurally
different.
YEAR 2019
16. What is the basic structural difference between starch and cellulose ? OR Write the products
obtained after hydrolysis of DNA 1 mark.
17. (a) What are the products of hydrolysis of maltose ? (b) What type of bonding provides
stability to -helix structure of protein ? (c) Name the vitamin whose deficiency causes
pernicious anaemia.
OR
Define the following terms : (a) Invert sugar (b) Native protein (c) Nucleotide 3 marks.
YEAR 2018
18.
[3]
YEAR 2017
19. After watching a programme on TV about the presence of carcinogens (cancer causing
agents) Potassium bromate and Potassium iodate in bread and other bakery products,
Rupali a Class XII student decided to make others aware about the adverse effects of these
carcinogens in foods. She consulted the school principal and requested him to instruct the
canteen contractor to stop selling sandwiches, pizzas, burgers and other bakery products to
the students. The principal took an immediate action and instructed the canteen contractor
to replace the bakery products with some protein and vitamin rich food like fruits, salads,
sprouts, etc. The decision was welcomed by the parents and the students.
After reading the above passage, answer the following questions :
(a) What are the values (at least two) displayed by Rupali ?
(b) Which polysaccharide component of carbohydrates is commonly present in bread ?
(c) Write the two types of secondary structures of proteins.
(d) Give two examples of water soluble vitamins [4]
YEAR 2016
20.
[3]
YEAR 2015
21.
[3]
YEAR 2014
22. What are the products of hydrolysis of sucrose ?[1]
23. Define the following terms as related to proteins : (i) Peptide linkage (ii) Primary structure
(iii) Denaturation [3]
