This document contains a biology exam for HSSC-I (Higher Secondary School Certificate) with questions testing knowledge of topics like cellular structures and functions, viruses, photosynthesis, and taxonomy of living organisms. The exam is divided into four sections (B, C, D) testing various concepts through short answer and essay questions. Section B contains questions about cellular organelles, enzymes, and immune response. Section C asks about symbiotic relationships, protist importance, plant reproduction, and distinguishing plant groups. Section D requires longer answers about HIV lifecycle, plasma membrane structure/function, glycolysis steps, or properties of water and mammal subclasses.

1. FAZAIA SCHOOLS & COLLEGES
SEND-UP EXAM: BIOLOGY HSSC-I
(Session 2017 – 18)
Roll No.
Name of Candidate
SECTION – B (Marks 18)
Time allowed : 2 Hours and 35 Minutes (Total Marks: 68)
NOTE: Sections ‘B’, ‘C’ and ‘D’ comprise pages 1-3 and questions therein are to be answered on the separately
provided Answer Book. Use supplementary answer sheet i.e., sheet B if required. Write your answers
neatly and legibly.
Q.2 Attempt any SIX parts from the following. All parts carry equal marks. (6× 3 = 18)
i. a. Illustrate the formation of sucrose showing a glycosidic linkage. 2
b. Why sucrose is a non-reducing sugar? 1
ii. What is density gradient centrifugation and differential centrifugation?
3
iii Lysosomes are single membranous, spherical sac containing hydrolytic enzymes.
a. How and where lysosomes are formed in a cell? 1
b. Why lysosomes are called suicide bags? 2
iv. Relate the role of prostaglandins in inflammation with the inhibition of prostaglandin synthesis through
3
aspirin.
v. a. Write down the functions of the following enzymes: 2
(1) Hydrolases
(2) Polymerases
b. Name the molecules which act as enzyme inhibitors. 1
vi. In what ways a virus survives inside a host cell, protected from immune system?
3
vii. Explain the process of cyclic photophosphorylation. 3
viii. The given diagram is of tRNA.
3
a. Identify the functions of the labeled part X and Y.
b. How many tRNA molecules are found in human cells?
c. At which end amino acid is attached to tRNA?
ix. a. Define the term Normal Flora. 1
b. Write down the symptoms, causes, treatment and prevention of Typhoid. 2

2. x. Write down the useful aspects of the following species: 3
a. Thiobacillus ferrooxidans
b. Rizobium
c. Escherichia coli
SECTION – C (Marks 24)
Q.3
i.
Attempt any SIX parts from the following. All parts carry equal marks.
Explain the mutualism established in mycorrhizae and lichens association.
(6 × 4 = 24)
4
ii. Justify how Protists are important to humans. 4
iii. Draw a life cycle of Funaria. 4
iv. a. Write down the uses of Gymnosperms. 2
b. Draw and label the structure of prothallus of Adiantum. 2
v. Discuss the characteristic features of the following protozoans: 4
a. Zoooflagellates
b. Ciliates
c. Apicomplexans
d. Trichonymphas
vi. Distinguish between the Dicots and Monocots with the help of diagrams. 4
vii. Define the term polymorphism. In how many forms the polymorphic colonies exist? 4
viii. Differentiate between protostomes and deuterosomes with the help of diagrams. 4
xi. Define inflorescence. Discuss its various types. 4
x. a. How Fungi are different from plants and animals? 2
b. Name two edible fungi. 2
SECTION – D (Marks 26)
Note: Attempt any TWO questions. All questions carry equal marks.
(2x13=26) Q.4 a. Describe the life cycle of HIV.
(7)
b. Explain the structure and functions of plasma membrane.
(6) Q.5 a. Outline, naming the reactants and products of each step of the events of glycolysis.
(7) b. Explain enzyme inhibition and feedback inhibition. (6)
Q.6 a. Write down the characteristics of three subclasses of Mammals. (6)
b. Write down the properties of water. (7)