Class
2nd 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 correct
option.
(1) A man takes larger amount of protein.
He is likely to excrete more amount of.
(a)
Uric acid (b)
Sugar
(c)
Amino acid (d) Urea
(2) Which part of mammalian brain control
muscular co-ordination ?
(a)
Cerebrum (b) Corpus
callosum
(c)
cerebellum (d) Medulla
oblongata
(3) Which part of brain control the blood
pressure ?
(a)
Reptiles (b)
Amphibian
(c)
Birds (d)
Mammals
(4) The development of embryo start by
repeated mitotic cleavage, in which group of animals there is a
discoidal
cleavage:
(a)
Thalamus (b)
Pons
(c)
Hypothalamus (d) Medulla
oblongata
(5) The following diagram is the T.S.
of somniferous tubule, which labeled part A-D is involved in secretion
of hormone testosterone ?
(6) In mitochondrial DNA the codon
UGA reads for.
(a)
Arginine (b)
Tryptophan
(c)
Mathionine (d) Lysine
(7) The birth frequency of jacob's syndrome
is.
(a)
Genotype (b) Genetic
code
(c)
Phenotype (d) Karyotype
(8) The physical manifestation of an
organism's genes is its.
(a)
1 (b)
1
(c) 1 (d)
1
1500
6000 700
1000
(9) In the F2 progeny of a dihybrid cross
the expected genotypic proportion of individuals homozygous for
both the dominant characters will be.
(a)
1 (b)
3 (c)
9 (d)
12
16
16 16 16
(10) The basis for addison's diseases is.
(a)
Hypo function of adrenal cortex (b)
Hyper function of adrenal medulla
(c)
Hyper function of adrenal cortex (d)
Hypo function of thyroid
(11) Plant cells are totipotent, this word was
coined by.
(a)
Hypo function of adrenal cortex (b)
Hyper function of adrenal medulla
(c)
Hyper function of adrenal cortex (d)
Hypo function of thyroid
(12) Which factor among the following does not
effect the frequency of allele ina stable population ?
(a)
Migration (b)
Genetic drift
(c)
Mutation (d)
Meiosis
(13) The average annual rainfall in temperate
decidous forest is.
(a)
500-1000mm
(b) 750-1500mm
(c)
750-1000mm (d)
1000-2000mm
(14) There are total six land biomes, how many
among them are present in Pakistan.
(a)
2 (b)
5
(c)
3 (d)
6
(15) A food chain consists of.
(a)
Producers and primary consumers
(b)
Producers,herbivores and decomposers
(c)
Producer,consumers and decomposers
(d)
Producers carnivores and decomposers
(16) The depleting source of energy is.
(a)
Wind (b)
Water
(c)
Sunlight (d)
Fossil fuels
(17) Which among the following is a mental illness
?
(a)
Kwashiorkor (b) Cretinism
(c)
Goiter (d)
Alzheimer
2. Attempt
any FOURTEEN parts.
(1) Kidneys are master chomist
of human body.
(a) What is counter current multiplier and how ADH influence its
function ?
(b) In what part of nephron aldosterone promte sodium uptake?
(2) Why kidney fail to remove
nitrogenous wastes and write names of two methods to artificially
remove
nitrogenous wastes and excessive water.
(3) Bones and cartilage are
the example of connective tissue.
(a) What are the names of mature bone and cartilage cells?
(b) Write types of cartilage and how these differ?
(4) What is the chomical
nature of auxins and why synthetic auxins are aconomical than natural
auxins?
(5) Give the commercial application
of NAA, lPA and 2, 4 D.
(6) Synapse is a contact
point of two neurons.
(a) Give a diagrammatic illustration of communication through synapse.
(b) Write names of any two neurotransmitters.
(7) Different colours of
sunlight has different effect on growth and development of plant.
(a) How red and far-red light antagonize the effect of one an other
?
(b) Write name of hormone which intiate flowering in plants?
(8) Define the following:
(a) Photoperiodism. (b)
Vernalization. (c) Apomixes.
(9) Development of an individual
from fertilized egg is a miracle of nature.
(a) What role the morphogenetic determinants play in development.
(b) Write the role of gray crescent area in development.
(10) Structure and working style of DNA
is a marvel of nature.
(a) How euchromation and heterochromatin differ from each other
?
(b) Give structural arrangement of a nucleosome.
(11) Draw structural formula of adenine,
thymine and Guanine.
(12) Cell cycle is a complex series of
events.
(a) How G 1 phase differ from G 2 phase ?
(b) Define karyokinesis and cytokinesis.
(13) Homologous chromosome during meiosis
I pair and exchange a segment of chromosome.
(a) What is recombination frequency?
(b) How it help in gene mapping?
(14) Define the following.
Epistasis. Pleiotropy.
Cordominance.
(15) Genetic engineering has brought
revolution in biological history.
(a) What is the role of restriction endonucleses in genetic engineering.
(b) Write names of any two plasmids used in genetic engineering.
(17) Only 1 % of solar energy is trapped
by Producers.
(a) Define biomass.
(b) Construct energy pyramid.
(18) Grasslands are found in various
continents.
(a) What is the difference betweem prairies and savanna?
(b) What is the productivity of tropical grassland?
(19) Environmental pollution has drastic
effect on both plant and animal life.
(a) What is the composition of ozone layer?
(b) How this layer is depleted?
3.
Skeletal muscles are stripped or striated muscles.
(a) Describe stripped nature of skeletal muscle by elaborting the
structure of a SARCOMERE.
(b) What changes appear during muscle contraction.
(c) How calcium ions are released into the sarcoplasm.
4. DNA
is a self replicating structure.
(a) What are the different hypothesis about replication of DNA?
(b) How Meselson and Stahl proved experimentally that DNA replicate
in semi-conservative way?
(c) Write two unique features of DNA polymerase-lll.
5.
Succession is a community relay.
(a) What is the difference between primary and secondary succession?
(b) Describe stages of xeroseres.
(c) Write significance of predation in ecosystem. |
