Sample Paper – 2012
Class – XI
Subject – Biology
Time: 3 Hrs
M.M:
70
a. All questions are compulsory.
b. The question paper consists of
30 questions divided into four sections A, B, C and D. The section A
contains 1-8 questions of 1mark each,
the section B consists of 9-18 questions of 2 marks each,
the section C has19-27
questions of 3 marks each and section
D includes 28- 30 question of
5 marks each.
c. There is no overall choice. However, internal choice has been provided in one question of 2
marks
each, in one question of 3 marks
each and in all the three questions of
5 marks each. You are
to attempt only one of
the two alternatives in case of an internal
choice question.
d. Wherever necessary, the diagrams drawn should
be neat, bold and properly labeled.
Questions
Section - A
01. Expand ICBN and ICZN.
02. What are phanerogams? What is the other name
for them?
03. The term “cell is actually a misnomer”.
Explain it in one sentence.
04. Why is the spleen known as blood bank?
05. Why slime moulds are
called as fungus-animals?
06. Which hormone is known
as an immunosuppressive and a stress hormone?
07. Name the enzyme secreted by the digestive
system of a man to digest proteins in acidic and alkaline
medium.
08. What are liverworts? Why
are they so called?
Section - B
09. What
is GERL system? Give two functions of the related cell organelle?
10. What is a palindromic region of DNA? The adenine in a DNA molecule is 20%,
Find out the amount
of guanine
in this DNA.
11. A nerve cell
releases 36 ATPs whereas a kidney cell releases 38 ATPs by complete oxidation
of one
gram mole of glucose.
Explain why it is so?
12. What is fungi imperfecti? Give out line
classification of kingdom fungi.
13. Give the botanical name of a plant of family
fabaceae. Show the floral formula and floral diagram of
the same plant.
14.
Name any one cranial nerve that controls eye ball movement. Is this
nerve a sensory, a motor or a
mixed one?
Give the total number of pairs of motor and sensory nerves in a human being.
15. Give the names of the three forms of the thalamus
or floral insertion in the same order as depicted?
16. Describe the functions of the endoplasmic
reticulum.
17. Draw the erythrocytic cycle
of malarial parasite in a human being.
OR
What is the basis of division of protozoan
protists? Give names of all groups of protozoan protest
with basic structure of each.
18. Identify the following
animal and give the zoological name and phylum of this animal. Give two
unique feature of the phylum it belongs to..
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Section - C
19. What is synapse? Explain how nerve
impulse is transmitted across a synapse?
20. Describe the induced-fit
hypothesis for mode of enzyme action. Pepsinogen, a proteinase enzyme of
stomach is an
exoenzyme or an endoenzyme? How sulfa drugs help in inhibition of bacterial
growth.
21. What
is meant by biological nitrogen fixation? Explain the process of biological
nitrogen fixation.
Give role of leghemoglobin in nitrogen fixation.
22. In most plants the terminal bud
suppresses the development of nearby lateral buds. What is this
phenomenon
called as? Name the phytohormone that can promote this phenomenon. Name a
gaseous plant
hormone and mention its three different
actions on plants.
23. The following diagram
shows CO2 assimilation
in sugarcane leaves. Name the components
marked as 1,
2, 3 and 4 in the diagram. Why this plant is said to have dimorphic
chloroplasts.
24. What are tidal volume
and vital capacity? List any two categories of people which possess higher
vital capacity.
25. Give the full form of ADH. Name the gland
that secretes it. It is released under what condition of the
body? What is
its role in forming hypertonic urine? What is the disease caused due to the
failure of
its secretion?
26. Name and explain three
phases of Calvin cycle. Where does this cycle takes place in a
cell.
27. Give outline classification of chordates with example of each
major group. Give two diagnostic
characters of chordata.
OR
Give outline classification of plant
kingdom with examples of each major group. Give two
diagnostic
characters of gymnosperms.
Section - D
28. What are the two heart sounds? How are these sounds produced? What
is the function of chordae
tendineae in a heart? Why
right ventricular wall is thinner than the left ventricular wall?
OR
What is
ascent of sap? Give the most acceptable theory of ascent of sap in higher
plants.
29. (i)
Following is a diagram of a monocot leaf. Identify the components marked as 1
and 2. Give
one
function of each of these components.
(ii)
Draw the T.S. of a dried mammalian bone.
(iii) What is cork cambium? Give the name of a
tissue formed by cork cambium.
OR
Draw a well
labeled diagram of digestive system of an earthworm. What is the role of
gizzard and
typhlosole in digestive system of an earthworm?
30. (i) Every time fertilization occurs, the chromosome
number is doubled. Yet the chromosome number
of a species remains constant.
Comment upon it.
(ii) Describe the sequence of the events in meiosis
I. What are the special events of homologous
chromosomes
during meiosis?
(iii)
A cell has 10 metacentric, 10
acrocentric.10 submetacentic and 10 telocentric chromosomes.
Give number of V and I shape chromatids
in anaphase of same cell.
OR
The two
lamellar model can not explain the permeability of plasma membrane and passing
of
water through
it. How is it explained by the fluid mosaic model?
Give the name
and draw the structure of a cell organelle that has double unit membrane.
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