Sample paper
BIOLOGY
Grade: X Max. Marks : 80
Time Allowed: 2 Hour
INSTRUCTIONS:
Answers to this paper must be written on the paper provided separately.
You will not be allowed to write during the first 15 minutes.
This time is to be spent in reading the question paper.
The time given at the head of this paper is the time allowed for writing the answers.
The intended marks for the questions or parts of questions are given alongside the
questions.
Attempt all questions from Section A and any four questions from Section B
This paper contains 8 printed sheets.
SECTION - A
(Attempt all questions from this Section.)
Choose the correct answers to the questions from the given
Question 1 [15]
options.
(Do not copy the questions, write the correct answer only.)
(i) The two sister chromatids of a metaphase represent:
a Chromosome of a diploid set
b Chromosomes to be separated at anaphase
c Chromosomes at the equatorial plane
d Maternal and paternal chromosomes joined at the centromere
Cell division by meiosis of a parent cell with 23 pairs of
(ii)
chromosomes will result in:
a 2 cells, each with 23 pairs of chromosomes.
b 2 cells, each with 23 single chromosomes.
c 4 cells, each with 23 pairs of chromosomes.
d 4 cells, each with 23 single chromosomes.
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(iii) A plant cell may burst when:
a Turgor pressure equalises wall pressure.
b Turgor pressure exceeds wall pressure.
c Wall pressure exceeds turgor pressure.
d Both b and c
Assertion (A): Most minerals must enter the root by active
absorption into the cytoplasm of epidermal cells.
(iv)
Reason (R): This transportation needs energy in the form of ATP.
Some ions also move into the epidermal cells passively.
Both assertion and reason are true and reason is the correct
a
explanation of assertion.
Both assertion and reason are true, but reason is not the correct
b
explanation of assertion.
c Assertion is true but reason is false.
d Both assertion and reason are false.
(v) Marine fish when placed in tap water bursts because of :
a Endosmosis
b Exosmosis
c Osmosis
d Plasmolysis
(vi) Loss of water (cell sap) through a cut stem is called ...............
a Bleeding
b Guttation
c Transpiration
d Injury
(vii) The device used to measure the rate of water uptake
a
b
c
d
A plant is kept in a dark cupboard for about 48 hours before
(viii)
conducting an experiment on photosynthesis to:
a Remove starch from the plant.
b Ensure that starch is not translocated from the leaves.
c Remove chlorophyll from the leaf of the plant.
d Remove starch from the experimental leaf.
Photosynthesis is effective when chlorophyll absorbs visible lights
(ix)
i.e.
a BLUE
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b RED
c BLUE, RED and GREEN
d BLUE and RED
(x) In tropic movements, plant parts move
a away from the stimulus
b either towards or away from the stimulus
c towards the stimulus
d only towards stimulus
(xi) Which of the following shows thigmotropic response ?
a Venus Flytrap
b Bryophyllum
c Cuscuta
d Lotus
Cretinism, mental retardation, low intelligence quotient, abnormal
(xii)
skin, deaf-mutism, etc.,are the results of
a Hyperthyroidism
b Hypothyroidism
c Goiter
d Both (b) and (c)
(xiii) Adrenal Virilism is caused due to
a Hypersecretion of Adrenal Cortex
b Overgrowth of Adrenal Cortex
c Overgrowth of Adrenal Gland
d Hyposecretion of Adrenal Cortex
Which one of the following is the correct route that a sperm follows
(xiv)
when it leaves the testis of a mammal ?
a urethra
b urethra
c Urethra vas deferens
d vas deferens
A vital connection between uterine wall and foetal membrane is
(xv)
called
a Uterus
b Placenta
c Embryo sac
d Amniotic sac
Question 2
(i) Name the following: [5]
3
a The chromosomes responsible for sex determination
The wax like layer on the epidermis of leaves which reduces
b
transpiration
c A plant in which the stomata are sunken
d The scientific phenomenon to overcome pruning
The movement of tentacles towards the source of nutrition in
e
Drosera
Arrange and rewrite the terms in each group in correct order
(ii) so as to be in a logical sequence beginning with the term that [5]
is underlined.
a Cytokinesis, G2-phase, Karyokinesis, S-phase.
b Endodermis, Cortex, Xylem, Root hair.
Boil the leaf in methylated spirit, destartch the plant, place the plant
c
in the sun, pour iodine solution.
d Morula, Foetus, Blastocyst, Zygote.
e Ovulatory phase, Menstrual phase, Luteal phase, Follicular phase.
Given below is a plant cell. Read the information below the
(iii) [5]
diagram and fill in the blanks with suitable words:
If the plant cell is kept in 5% salt solution for a few minutes, it will
.... and the cells in this state are said to
(iv) Read the explanations given below and name the structure [5]
The structure at which two non sister chromatids of a paired
a chromosome during the process of crossing over are attached to
each other
The structure that allows the passage of molecules in the cell
b
selectively
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The structure in angiosperm and gymnosperm plant that moves
c
towards sugars and peptones.
d A bilobed structure situated in front of neck below the larynx
A muscular organ situated in the pelvic cavity between urinary
e
bladder and rectum
Match the items given in Column I with the most appropriate
(v) [5]
ones in Column II and rewrite the correct matching pairs.
Column I Column II
1. thylakoid
a
2. inner membrane
3. grana
4. fret
e b
d c
5. outer membrane
6. stroma
Section B
(Attempt any four questions from this Section)
Question 3
(i) Explain the term - Active Transport [1]
(ii) State Law of Segregation [2]
Name the phenomenon depicted in the image shown below and
(iii) [2]
define it.
Distinguish between diabetes insipidus and diabetes mellitus with
(iv) [2]
respect to its cause
Draw a well labelled structure of turgid guard cell with opened
(v) [3]
stomata
Question 4
(i) State the exact location of Pituitary gland [1]
5
Identify the steps occurring during photosynthesis and rewrite the
terms in the correct order so as to be in a logical sequence:
(ii) [2]
(a) photolysis, (b) oxygen, (c) activation of chlorophyll, (d)
hydrogen and hydroxyl ions, (e) photophosphorylation
(iii) Differentiate between turgor pressure and wall pressure [2]
Name the plant hormone responsible for ripening of bananas and
(iv) [2]
mention its any one characteristic
(v) Draw a well labelled diagram of the human sperm [3]
Question 5
(i) Define Transpiration [1]
(ii) Give any two functions of amniotic fluid [2]
What are phytohormones. Wwhich is the main natural auxin found
(iii) [2]
in plants.
Explain the two principal ways by which sugar level in blood is
(iv) [2]
regulated by insulin
The figure shows a certain stage in cell division in a cell with 4
(v) [3]
chromosomes.
a Identify the stage. Give one reason in support of your answer
b Is this a plant cell or animal cell? Give reason
Question 6
(i) What is the function of adrenaline [1]
(ii) Differentiate between gestation and parturition (definition) [2]
Mention any two adaptations found in plants to favour the process
(iii) [2]
of photosynthesis.
Simple goitre is seen mostly in people living in hilly regions. Give
(iv) [2]
reason
(v) Observe the following and answer to the given questions: [3]
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1 2
Which phenomenon is shown in the given image 1 and 2. Define
a
the same
What happens to the red blood cells in image 2 when placed in
b
hypotonic solution
Question 7
(i) Define parthenocarpy [1]
What is the significance of the testes being located in scrotal sac
(ii) [2]
outside the abdomen?
Distinguish
(iii) [2]
(cause and blood sugar level)
A homozygous plant having round (R) and yellow (Y) seed is
(iv) crossed with homozygous plant having wrinkled (r) and green (y) [2]
seeds:
Give the scientific name of the plant on which Mendel conducted
a
his hybridization experiments.
b Give the genotype of the F1 generation.
Given below is an apparatus used to study a particular process in
(v) [3]
plants. Study the same and answer the questions that follow
a Which phenomenon Is studied with the help of this apparatus
b
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c Mention one limitation of this apparatus
Question 8
(i) Give any two functions of Abscisic acid [1]
Give scientific reason for the statement: Colour blindness is more
(ii) [2]
common in men than in women.
A candidate in order to study the process of osmosis has taken 3
potato cubes and put them in 3 different beakers containing 3
different solutions. After 24 hours, in the first beaker the potato
(iii) [2]
cube increased in size, in the second beaker the potato cube
decreased in size and in the third beaker there was no change in
the size of the potato cube.
Give the technical terms of the solutions used in beaker 1, 2, and
a
3
Explain the phenomenon that leads to this change in the size of
b
potato
Choose the appropriate word from the bracket and complete the
(iv) [2]
following statements.:
The acrosome of sperm contains (hyaluronidase, mitochondria,
a
DNA, hyaluronic acid)
The cell formed through fertilization is called (gamete, sperm,
b
zygote, ovum)
Study the diagram given below and then answer the questions that
(v) [3]
follow :
Name the cells of the pancreas that produce (1) glucagon (2)
a
insulin
b Why is the pancreas referred to as an exo-endocrine gland
c Why is insulin not given orally but its injected into the body?
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