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 ?