2015
LIFE SCIENCE
(BIFURCATED SYLLABUS)
Time- Three Hours Fifteen Minutes
(First fifteen minutes for reading the question
paper only)
Full Marks-90 (For Regular and Sightless Regular
Candidates)
Full marks-100 (For External and Sightless External
Candidates)
FOR REGULAR, EXTERNAL AND SIGHTLESS
CANDIDATES
Special credit will be given for answers which are
brief
and to the point. Marks will be deducted for
spelling
mistakes, untidiness and bad handwriting.
[English Version]]
(Bifurcated Syllabus)
(For Class X Syllabus Only)
Directions
For
Regular Candidates, the questions
of Group 'A' , 'B'
and
'C' will have to be answered.
For
External Candidates, the questions
of Group 'D'
will
also have to be answered in addition to group 'A',
'B'
and 'C'.
Instructions
regarding the number of questions to be
attempted
have been indicated at the beginning of each
group.
Special Instruction for Sightless Candidates
In Group 'C', instead of Question
Nos. 12 and 13, any
one of the Question Nos. 12(A) and
13(A) will have to
be answered.
Group 'A'
[Candidates will have to answer question Nos. 1,2,3
and 4]
1. Complete the
sentences choosing the correct
answer (any five): 1x5=5
(i) Myelin Sheath is observed on
(a)
the axon of all neurones
(b)
the dendrons of all neurons
(c)
the axon and dendron of all neurons
(d)
the axon of some neurons
(ii) Insulin hormone secreting gland is
(a)
Adrebal (b) Pituitary
(c)
Thyroid (d)
Pancreas
(iii) The
phase of mitosis in which nuclear Membrane reappears is
(a)
Prophase (b) Metaphase
(c)
Anaphase (d) Telophase
(iv) A
plant which performs vegetative reproduction with the help of sub-aerial stem
is
(a)
Potato (b) Water
hyacinth
(c)
Ginger (d) Onion
(v) The organ in human body which considered a
vestigial organ
(a)
Stomach (b) Colon
(c)
Appendix (d) Rectum
(vi) The organ absent in pigeon to aid ion
flight is
(a)
Left ovary (b) Gall bladder
(c)
Lung (d) Right Kidney
(vii) The disease which is caused by viral
infection, is
(a)
Influenza (b) Cholera
(c)
Malaria (d) Tuberculosis
2. Answer in one
sentence (any ten) : 1x10=10
(i) Which
substance, present in the latex of papaya, helps in the digestion of protein?
(ii) An
organ in human body, where urea is synthesized, is _______. (Fill in the blank
and write the complete sentence)
(iii) What is Meninges?
(iv) One
of the sites of formation of Gibberellin hormone is _______. (Fill in the blank
and write the complete sentence)
(v) Which
hormone is related to the pounding of heart when scared?
(vi) Mention one significance of meiosis cell
division.
(vii) How
many pairs of contrasting characters in pea plant were selected by Mendel for
his experiments on heredity?
(viii) What kind of reproduction the spore is the
unit of?
(ix) Write
the name of an organ of an animal which is homologous to birds’ wings.
(x) Mention one important change in the
evolution of horse.
(xi) Due
to presence of ________ in the eye of pigeon, the vision becomes very sharp.
(Fill in the blank and write the complete sentence)
(xii) Name one fungus that infect human lungs.
(xiii) Why
is the skin wiped with spirit (alcohol) before pushing n injection?
3. Attempt any six
questions : 2x6=12
(i) Mention the source and one economic
importance of resin.
(ii) What is inborn reflex action? Give an
example.
(iii) From
which gland TSH is secreted? Write down its one main function.
(iv) What
are the sex chromosomes in the male and female human body?
(v) What
do you mean by parthenogenesis? Give an example of it.
(vi) From
which observations Darwin arrived at the conclusion – “Struggle for Existance”?
(vii) Discuss
one adaptive importance each of lateral line sense organ and swim bladder in
rohu fish?
(viii) Mention two structural characteristics of
‘virus’.
4. Attempt any ten
questions: 3x10=30
(i) Write
one function each of Glomerulus, Proximal Convoluted Tubule and Henle’s loop of
a nephron. 1x3=3
(ii) Mention
one function of each of Cerebrum, Cerebellum and Medulla oblongata in human brain.
1x3=3
(iii) Mention
one structural feature of each of Sclera, Choroid and Retina in a human
eyeball. 1x3=3
(iv) Mention
two differences between exocrine and endocrine glands. Give an example of a mixed
gland in human body.
2+1=3
(v) Mention
three roles of Auxin hormone in the growth of plants. 1x3=3
(vi) What is cell cycle? Name any two stages of
interphase.
1+2=3
(vii) What
is cytokinesis? Mention two differences in between cytokinesis of plant and
animal cell. 1+3=3
(viii) What
is ‘Alternation of generation’? Name two plants groups where alternation of
generation is seen distinctly. 1+2=3
(ix) Write
down Mendel’s Law of Segregation. Mention one difference in between Phenotype
and Genotype. 2+1=3
(x) Write
name of three ancestors of modern horse. 1x3=3
(xi) Name three adaptive features for flight in
pigeon. 1x3=3
(xii) Write
down the modes of transmission of influenza virus, HIV and Polio virus. 1x3=3
(xiii) Mention
one beneficial role each of Saccharomysises (Yeast), Penecillium and Rhizobium.
1x3=3
Group 'B'
(Answer any five questions from
Question No. 5 to Question No. 11)
5. Mention
one economic importance each of Quinine, Reserpine and Morphin. What are the
means of removal of excretory products in silk cotton(shimul) and Guava?
(1x3)+2=5
6. Write
down one structural and one functional difference in between Afferent and
Efferent nerve. What is Synapse and what is its function? Mention one function
of spinal cord.
2+2+1=5
7. Write
down the names of sites of secretion and one function each of Testosteron and
Oestrogen. Mention one function of GTH. 2+2+1=5
8. What
is amitosis? What events take place during Prophase and Telohase stages of
Mitosis? 1+(2+2)=5
9. What
is Vegetative reproduction? Give two examples of natural vegetative
reproduction in plants. Mention two importances of vegetative reproduction. 1+(2+2)=5
10. Explain
the ‘Law of Use and Disuse’ and ‘Law of Inheritance of acquired character’ as
proposed by Lamarck. What is variation? (2+2)+1=2
11. Mention the
adaptive significance of the following
organs: 1x5=5
(a) Breathing roots of
Sundari
(b) Gill of rohu fish
(c) Petiole of lotus
(d) Leaf of cactus
(e) Tail fin of rohu
fish
Group 'C'
(Answer any one question)
12. Draw
a scientific diagram of an ideal neurone of the human body and label the
following parts in the diagram : 5+3=8
(a)
Nodes of Ranvier
(b)
Axon
(c)
Schwann cell
13. Draw
a neat and scientific diagram each of ‘Second Phase’ and ‘Third Phase’ of
Karyokinesis of Mitosis in an animal cell and label the following parts: (2½ +2½)+(1½+1½)
(a)
Continuous fibre
(b)
Centromere
(c)
Chromosomal fibre
(For sightless Candidates Only)
(Answer any one question)
(Diagram not required)
12(A). Define
neurone. Name the two types of processes of an ideal human neurone and write
their respective structures in brief. What are the functions of these two types
of processes respectively? 1+1+4+2=8
13(A). Discuss the
characteristics and significance of ‘Second Phase’ and ‘third Phase’ of
Karyokinesis of Mitosis in an animal cell. 4+4=8
Group 'D'
(Only for External Candidates)
(Answer any one question)
14. (a) Describe the structure and function of
Mitochondria.
(b)
Point out three differences in between ‘Plant cell’ and ‘Animal Cell’.
(c)
Discuss the Characteristics and functions of ‘Skeletal Muscles’. 4+3+3=10
15. Write short notes on any four : 4x2½=10
(a) Nucleus
(b) Plastid
(c) Cell wall (d)
Ribosome
(e) Golgi Bodies
________________
Thanks a lot...but is it a real question paper
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