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Guess Papers
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Class 1st Year) |
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Class
1ST YEAR Federal Board 2009
Paper:Biology (Objective Type) Time
Allowed: Max.Marks:
Note:Use this paper
to write the answers to the objective questions.No marks will be awarded
for cutting,over-writing
or using a pencil.This paper must be tagged with the answer-book.
1- Insert the correct option.
(i) Figure below shows two glucose molecules joined
by glycosidic bond.
CH2OH
HOCH2 CH2OH
Which of
the following can break this bond to separate the two glucose molecules.
(A) High temperature (B)
condensation
(C) Change
in pH (D)
Hydrolysis
(ii) A tadpole's tail is gradually broken down during
metamorphosis into an adult frog. Which organelle increases
in number in the cells of the tail at this time
(A)
Golgi Apparatus (B)
Lysosome
(C) Pinocytic
vesicle (D) Centriole
(iii) The rate of an enzyme controlled reaction increases rapidly
if the amount of enzyme is doubled in the presence
of an unlimited substrate concentration. This is due to:
(A)
Number of active sites increases. (B)
Energy of activation lowers.
(C)
Kinetic energy of molecules increases. (D)
Enzyme does not denature.
(iv) Which combination is foud in a prokaryotic cell?
Mitochondria
Ribosomes DNA
RNA
(A)
Present Present
Absent Absent
(B) Present
Absent
Present
Absent
(C)
Absent Present
Present
Present
(D)
Absent Absent
Present
Present
(v) Some ranks of classification are listed below.
In which group, would there be the greatest similarity between
members in terms of structure and function
(A)
Species (B)
Genus
(C)
Kingdom (D) Phylum
(vi) Messenger RNA carries genetic information from
DNA to ribosomes where amino acids are arranged
from specific proteins. Hemoglobin is also such a protein which contains
574 amino acids. How
many nucleotides should be present in an mRNA molecule to synthesize
a hemoglobin molecule?
(A) 574 (B)
1148
(C)
1722 (D)
2296
(vii) Which of the folloeing is mis-matched?
Disease
Type of virus
(A)
Small pox DNA virus
(B)
Influenza RNA virus
(C)
Measles RNA virus
(D)
AIDS DNA virus
(viii) Many bacteria contain flagella for their locomotion.
When flagella surround the whole bacterial cell, this
condition is aclled as:
(A)
Atrichous (B)
Lophotrichous
(C)
Amphitrichous (D) Peritrichous
(ix) Foraminiferans and actinopods are the
marine protozoa. They produce porous shells through which cytoplasmic
projection extend out to form a sticky network. The function of this
network is
(A)
Locomotion (B)
To trap prey
(C)
Defence (D)
Secretion
(x) Figure below shows branched and septate
mycelium of penicillium containing naked spores at the tips:
What is the name given to these spores labeled as X
(A)
Asci (B) Conidia
(C) Basidia
(D) Zygospores
(xi) The diagrames below show simple life
cycles of two types of plants. Where will meiosis occure in life
cycles
(A)
At L and N (B)
At k and M
(C)
At L and M
(D) At K and N
(xii) Cyclostomata includes most primitive living
vertebrates which were without:
(A)
Auricles (B)
Cartilaginous skeleton
(C)
Jaws (D)
Paired gills
(xiii) Which of the following indicates the route of a
glucose molecule from mesophyll cell to human muscle
via root of the same plant?
(A)
Glucose-->starch-->Glucose-->Maltoso-->starch
(B) Glucose-->Malyose-->starch-->Maltose-->Glycogen
(C) Glucose-->starch-->Maltose-->Glucose-->starch
(D) Glucose-->starch-->Maltose-->Glucose-->Glycogen
(xvi) Cellular respiraton is sub-divided into four stages. Which
one of these does not take place in mitochondria?
(A) Respiratory
chain (B)
Krebs cycle
(C)
Glycolysis (D)
Pyruvic acid oxidation
(xv) A person with emphysema must consciously contract
muscles in order to breathe out. What makes this
muscle contraction necessary?
(A)
Constriction of bronchioles (B)
Excess mucus blocking air passages.
(C)
Loss of elasticity in alveolar walls. (D) Paralysis
of cilia in air passages.
(xvi) In which combination of environment conditions are the
stomata of a plant most likely to close?
Atmospheric
Humidity Soil
water potential Wind
speed
(A) High
High High
(B) High
Low
Low
(C) Low
High
Low
(D) Low
Low
High
(xvii) Three of the cardiac cycle are shown in figure below. Which
sequence of changes is correct?
Atria
contract Ventricles contract End of cardiac cycle
(A)
1 2 3
(B) 3
2 1
(C) 2
3 1
(D) 2
1 3
2. Attempt any FOURTEEN
parts. (14x3=42)
(i) Aseries of tested hypotheses result in a theory
under which condition a theory becomes a law?
(ii) (a) Enzymes need non-protein part for their proper
functioning. called co-factors.
Find
the name of the c0-factor which is:
(i)
Loosely attached (ii) Convalently
bonded to its enzyme.
(iii)
Carbon is the basic element of organic compounds and combines with
many other elements like C-
H bond,C. N bond and C- O bond. List important feature of each bond.
(iv) (a) Explain why in a DNA molecule, Adenine always
pairs with thymine and guanine pairs with cytosine.
(b) Give only one
difference between saturated and unsaturated fatty acids.
(v) Figure below shows a prokarotic cell.
(a)
What is the function of structure lableled as 'X'?
(b)
Give two features,shown in the figure, which prove that it is a prokaryote.
(vi) Binomial nomenclature is the system given by Carlous
Linnaens to name thew organisms. Give any three
rules of naming the organisms in this system.
(vii) What are antibiotics? State three ways in which antibiotics
effect the harmful micro-organism.
(viii) How do micropjhylls and megaphylls differ from each other?
(ix) Define the following terms.
(a)
Paraphyses (b) Protonema (c) Lysozyme
(x) Botanical names of three plants are given below.for
each, Write the common name.;
(a)
Oryza sativa. (b) Arachis hypogea (c)
Brassica campestris.
(xi) (a) body wall of earth consists of circular and longitudinal
muscles. How do these muscles help in its locomotion
?
(b) List those
features of archeoptery-x, the fossil bird, which resemble with the
modren birds.
(xii) (a) Write the symptoms of piles.
(b)
''Pepsin '' is a protein digesting enzyme and can be degradative to
the stomach wall. In normal conditions
how it is prevented form doing so ?
(xiii) What is photo respiration ? Write its consequences.
(xvi) When and at what conditions,cyclic phosphorylation starts
during photosynthesis?
(xv) (a) After surgical removal of an infected gall bladder,
a person must especially be careful to restrict the
dietary intake of fats.Why ?
(b)
Sucrose is a sugar and provides considerable amount of energy. Yet
it can not be administered to patoent
ntravenously.Why ?
(xvi) Name the states in which canbondioxide is transported
in blood.
(xvii) Differentiate between inspiration and expiration.
(xviii) Figure below shows cross section of an artery and a
vein.
Write
any three differences between the two types of vessels as seen in
the diagrams.
(xix) Name the values present in human heart. Briefly
discuss their role in blood circulation.
Attempt any TWo questions. (2 x 14=26)
3.a. Described different theories about the structure
of plasma membrane.
b. Cytoskeletal
fabric is formed in cytosol. Name its types and briefly described
each.
c. How does electron
microscope differ from compound microscope in its working ?
4.a. List the main feature s of Sac-Fungi.
b. Write a short essay on
pathogenic role of fungi.
c. What
are the differences and similarities between slime molds and true
fungi ?
5.a. Draw a labeled diagrammatic sketch of
calvin cycle.
b. Briefly
discuss the role of pressure potential on plasmolysis.
c.
What is meant by passive immunity ? Why its
effects are not long lasting ? |
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