Punakha Higher Secondary School
Trial-Examination- 2014
BIOLOGY
Paper – 1
(THEORY)
(Botany and Zoology)
Three hours and a quarter
(The first 15 minutes of the examination are for reading the paper only.
Candidates must NOT start writing during this time).
------------------------------------------------------------------Answer all questions in Part I and five questions from Part II, choosing three questions
from Section A and two questions from Section B.
All workings, including rough work, should be done on the same sheet as, and adjacent to;
the rest of the answer.
The intended marks for questions are given in brackets [ ].
------------------------------------------------------------------------------------------------------------
PART I (40 marks)
Answer all questions.
Question 1.
(a) Read the following questions carefully. For each question there are four alternatives
A, B, C and D. Choose the correct alternative and write it in your answer sheet. [5]
i)
In mammals, corpus callosum connects,
A) A muscle to bone
B) A bone to another bone
C) Mid brain to medulla oblongata
D) Two cerebral hemispheres.
ii)
Ovulation occurs under the influence of
A) LH
B) FSH
C) Estrogen
D) Progesterone
iii)
The essential element for the synthesis of auxin
A) Zinc
B) Sulphur
C) Potassium
D) Phosphorus
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iv)
Tigmotropism is best exemplified by
A) Root apex
B) Thorns
C) Tendrils
D) Lamina
v)
According to Histogen theory, epidermis is formed by
A) Dermatogen
B) Protoderm
C) Peribelem
D) Pelrome
vi)
The correct sequence of embryogenesis in vertebrates is
A) cleavage→ morula → gastrula → blastula.
B) cleavage →gastrula →morula → blastula.
C) cleavage → morula →blastula →gastrula.
D) cleavage →blastula → gastrula →morula.
vii)
Which is correct regarding evolution of mankind,
A) Homo erectus was proceeded by homo habilus
B) Australopithecus lived in Australia
C) Neanderthal man and Cro-Magnon man lived together
D) None of the above.
viii)
Which one of the diseases is correctly matched with its pathogen?
A) Tetanus – salmonella
B) Cholera - vibrio comma
C) Plague – corynebacterium
D) Tuberculosis - mycobacterium leprae
ix)
Photorespiration is favoured by
A) High oxygen and low carbon dioxide
B) High carbon dioxide and low oxygen
C) High temperature and low oxygen
D) High humidity and temperature
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x)
Neurogenic heart is the characteristics of
A) Humans
B) Lower vertebrates
C) Rat
D) Rabbit
(b)Match each item of Column A with the most appropriate item of Column B. Rewrite the correct
matching pairs in your answer sheet.[5]
Column A
i)
ii)
iii)
iv)
v)
vi)
vii)
viii)
ix)
x)
Column B
Connecting link
Missing link
Rennin
Transpiration rate
Uricotelic
Ureotelic
Periosteum
First ape man
Acromegaly
Cretinism
a)
b)
c)
d)
e)
f)
g)
h)
i)
j)
k)
l)
m)
Casein
Growth hormone
Austropithecus
Thyroxine
Urea
Archaeopteryx
Uric acid
Bone
Potometer
Parapithecus
Latimari
Muscle
Auxanometer
(c) Fill-in-the-blanks with appropriate words. Write only the correct answers in your answer sheet.
Donot copy the whole sentence. [5]
i.
ii.
iii.
iv.
v.
vi.
vii.
viii.
ix.
x.
An uninterrupted dark period is required by ………………….. plants.
In C3 plants the carbon dioxide acceptor is …………………
A ……………….. muscle rotates the forearm to turn the palm downward.
Air forcibly inhaled after a normal inspiration is ……………………...
LSD is prepared from …………………
The entry of Pollen tube through the micropyle into the embryo sac is called.................
Succusentricus is a secretion of ……................
Population of genetically identical plants derived from an individual is
called…………………
Reversion of the specilalised cells back to embryonic, actively dividing state is
called……………………….
During grafting, the part that becomes the supporting portion is called
………………………….
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(d) Expand the following: [2 ½]
i.
ii.
iii.
iv.
v.
CCC
OAA
ACTH
RFLP
2,4-D
(e) Write one contribution of the following scientist:[2 ½]
i.
ii.
iii.
iv.
v.
Chardack
Meyer
Stayler and Taylor
William Harvey
Hanstein
(f) Mention the most significant function of the following:[5]
i.
ii.
iii.
iv.
v.
Prosenchyma
Funicle
Pyloric spinchter
Bartholine gland
Vagus nerve
(g) Write one difference between each of the following:[3]
i.
ii.
iii.
Sympathetic nerve fibres and parasympathetic nerve fibres
Dormancy and Quiescence
Hallucinogens and teratogens
(h) Give reasons for the following:[5]
i.
ii.
iii.
iv.
v.
Athletes are tempted to use anabolic steroids.
When foetus is implanted after fertilization, menstruation does not occur.
Gibberellic acid induces reversal of dwarfism in many genetically dwarf plants.
The desert animals have longer loop of Henle.
Photosynthesis is high when light energy is received in flashes than continuously.
(i) Give the scientific names of the following:[2]
i.
ii.
iii.
iv.
Fruit developing from the whole inflorescence
Occurrence of one or more form of a character in the individuals in a population.
Antibodies made outside the body by hybrid cell culture.
Sudden and random changes occurring in allele frequency, in a small population by
chance alone.
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(j) Observe the relationship between the first two words and fill in the suitable word in the
fourth place.
i.
ii.
iii.
iv.
v.
[5]
Stomata : Transpiration::Hydrathodes: ………………….
Homo erectus :the upright man ::Homo habilis : ……………………….
Polyuria: Excess of urine : : Anuria: …………………..
Artificial kidney: blood dialyser :: artificial lung:……………………
Alcohol : Depressant : : opium: ………………………..
PART II
SECTION A (30 marks)
Answer any three questions
Question 2
a) Explain the secondary growth in dicot roots. What is the significance of secondary
growth in roots.
[2+1= 3]
b) Study the table below and complete the table
[2]
Sl. No
Elements
Deficiency symptoms
1.
Boron
i.
………………
ii.
……………….
2.
Magnesium
i.
………………
ii.
………………..
c) Justify the statement, “Adrenal gland secrets lifesaving hormones.”
[3]
d) Muscles occur in antagonistic pairs, explainthe statement with the help of an example[2]
Question 3
a) Give a schematic outline of Hatch-Slack pathway and explain briefly[3]
b) Briefly describe the Osmotic theory of Active water absorption.
[2]
c) Briefly summarize the events occurring during action potential.
[3]
d) Differentiate between the nuclear type and cellular type of endosperm formation. [2]
Question 4
a) Briefly describe the digestion of protein in human digestive system.
[3]
b) List down six agricultural use of Auxins.
[3]
c) Draw a schematic diagram for cyclic photophosphorylation.
[2]
d) Failure of testes to descend into scrotum produced sterility. Why? Which hormone is
responsible for descending of testes into scrotum?
[2]
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Question 5
a) Draw a well labeled diagram of L.S of ovary showing the process of fertilization. [2]
b) List at least four points of differences between photoperiodism and vernalisation. [2]
c) Trace the biochemical events during muscle contraction.
[4]
d) What is meristem? List the types of meristem based on their location in plant body?[2]
Question 6
a) How is urine formation controlled by hormones?
[3]
b) A person unconsciously withdraws his hand on touching a hot pot.[3]
i.
Draw a schematic diagram to represent the flow of impulse to this response.
ii.
What is the response called?
c) Describe what happens in the different phases of cardiac cycle in humans.
[4]
SECTION B (30 marks)
Answer any two questions.
Question 7
a) What are coacervatives? How are they formed?
[3]
b) What do you understand by the terms ‘inbreeding’ and ‘outbreeding’?
[2]
c) What role does mutation play in evolution?
[3]
d) Based on Lamarck and Darwin’s theory explain why giraffe have long necks.
[4]
e) Explain the terms Bioenergy, Biotechnology and Petrocrops.
[3]
Question 8
a) Fossils reveal the course of evolution of plants and animals. In the light of thisstatement
answer the following:[4]
(i) Distribution of fossil in the rocks
(ii) Missing link
(iii) Evolutionary history of individual form and
(iv) Land patterns
b) Why biofertilisers are preferred over chemical fertilizer?
[2]
c) “Persons suffering from G-6-PD deficiency are resistant to malaria.” Explain.
[3]
d) List FOUR ways of treatment we can give to a person suffering from mental disorders?
[2]
e) What is cancer? What causes cancer?
[2]
f) Enumerate the role of genetic counselling.
[2]
Question 9
a) ‘Polyploidy is a genetic mechanism that leads to the origin of new species’. Support this
statement with the example of origin of hexaploid wheat.
[4]
b) Give reason why alcohol is not a food but produces energy?
[1]
c) Why wing of a bat is homologous to the wing of a bird and analogous to insects? [2]
d) Distinguish between inversion and translocation with the help of a simple diagram. [3]
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e) Highlight the steps a farmer should follow to apply green manure to crops. Pinpoint the
most important advantage of using green manure.
[3]
f) Distinguish between hybridization and emasculation.
[2]
Question 10
a) Give reason for the following statement:
[2]
i.
Psychotropic drugs are called mood-altering drugs.
ii.
Women usually do not suffer from haemophilia.
b) A certain person was found to have 47 chromosomes in his body cells instead of normal
46. Mention any three chromosomal abnormalities and main symptom each associated
with them in such case.
[3]
c) Explain briefly about the following:
[5]
i.
MOET
ii.
Endoscopy
iii.
Cryopreservation
iv.
Atavism
v.
Neanderthal man
d) Explain two types of immunity.
[2]
e) What is meant by genetic engineering? What role does it play in crop improvement and
what are its limitations?
[3]
*******ALL THE BEST*****
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