The question paper carries total of 80 marks and is divided into two sections, each carrying 40 marks. From Section-I, all questions have to be answered whereas from Section-II, can attempt any 4 questions.
General 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 the paper is the time allowed for writing the answers.
Attempt all questions from Section I and any four questions from Section II. The intended marks for questions or parts of questions are given in brackets []
Section-I [40 Marks] (Attempt all questions from this section)
Question 1
(a) Name the following: [5]
(i) The exchange of chromatid parts between the maternal and the paternal
chromatids of a pair of homologous chromosomes during meiosis.
(ii) The number of individuals inhabiting per unit area.
(iii) The immunity acquired by providing readymade antibodies from outside
for treating certain infectious diseases.
(iv) The pollutants that cannot be broken down to simple and harmless
products.
(v) The part of the brain that carries impulses from one hemisphere of the
cerebellum to the other.
(b) Choose the correct answer from each of the four options given below: [5]
(i) 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. None of the above
(ii) The individual flattened stacks of membranous structures inside the
chloroplasts are known as :
A. Grana
B. Stroma
C. Thylakoids
D. Cristae
(iii) The nephrons discharge their urine at the :
A. Urinary bladder
B. Urethra
C. Renal pelvis
D. Renal pyramid
(iv) Gigantism and Acromegaly are due to :
A. Hyposecretion of Thyroxine
B. Hyposecretion of Growth hormone
C. Hypersecretion of Thyroxine
D. Hypersecretion of Growth hormone
(v) The mineral ion needed for the formation of blood clot is :
A. Potassium
B. Sodium
C. Calcium
D. Iron
(c) In each set of terms given below, there is an odd one and cannot be grouped
in the same category to which the other three belong. Identify the odd erm
in each set and name the category to which the remaining three belong. [5]
Example : ovary, Fallopian tube, Ureter, Uterus.
Odd term : Ureter
Category : Parts of female reproductive system.
(i) Sewage, newspaper, Styrofoam, Hay.
(ii) Thymine, Cytosine, Adenine, Pepsin.
(iii) Malleus, iris, Stapes, Incus.
(iv) Cortisone, Somatotropin, Adrenocorticotropic hormone, Vasopression.
(v) Typhoid, Haemophilia, Albinism, Colour blindness.
(d) Complete the following paragraph by filling in the blanks (i) to (v) with
appropriate words: [5]
(i) _____________ secreted by the (ii) _____________ lobe of the pituitary
gland. If this hormone secretion is reduced, there is an increased
production of urine. This disorder is called (iii) ____________.
Sometimes excess glucose is passed with urine due to hyposecretion of
another hormone called (iv) _____________ leading to the cause of a
disease called (v) ______________.
(e) State the exact location of the following structures: [5]
(i) Centromere
(ii) Chordae tendinae
(iii) Thyroid gland
(iv) Ciliary body
(v) Proximal convoluted tubule
(f) Given below is a diagram depicting a defect of the human eye, study the
same and then answer the questions that follow: [5]
(i) Name the defect shown in the diagram.
(ii) What are the two possible that cause this defect?
(iii) Name the type of lens used to correct this defect.
(iv) With the help of a diagram show how the defect shown above is rectified
using a suitable lens.
(g) Given in the box below are a set of 14 biological terms. Of these, 12 can be
paired into 6 matching pairs. Out of the six pairs, one has been done for you
as an example. [5]
Example : endosmosis - Turgid cell.
Identify the remaining five matching pairs :
Cushing’s syndrome, Turgid cell, Iris, Free of rod and cone cells, Colour of
eyes, Hypoglycemia, Active transport, Acrosome, Addison’s disease, Blind
spot, Hyperglycemia, Spermatozoa, Endosmosis, Clotting of blood.
Solution:
Iris: Colour of eye
Blind Spot: Free of rod and cone cells
(h) State the main function of the following : [5]
(i) Lymphocytes of blood
(ii) Leydig cells
(iii) Guard cells
(iv) Eustachian tube
(v) Corpus luteum
SECTION II (40 Marks)
Attempt any four questions from this Section
Question 2
(a) The figure given below is a diagrammatic representation of a part of the
cross section of the root in the root hair zone. Study the same and then
answer the questions that follow : [5]
(i) Name the parts indicated by the guidelines 1 to 4.
(ii) Which is the process that enables the passage of water from the soil into
the root hair?
(iii) Name the pressure that is responsible for the movement of water in the
direction indicated by the arrows. Define it.
(iv) Due to an excess of this pressure sometimes drops of water are found
along the leaf margins of some plants especially in the early mornings.
What is the phenomenon called?
(v) Draw a well labelled diagram of the root hair cell as it would appear if an
excess of fertiliser is added to the soil close to it.
(b) Differentiate between the following pairs on the basis of what is mentioned
within brackets : [5]
(i) Human skin cell and Human ovum (number of chromosomes).
(ii) Sperm duct and fallopian rube (function)
(iii) Red Cross and WHO (one activity)
(iv) Rod cells and cone cells (pigment)
(v) LUBB and DUP (names of the valves whose closure produce the sound)
Question 3
(a) Given below is the outline of the human body showing the important glands :
[5]
(i) Name the glands marked 1 to 4.
(ii) Name the hormone secreted by part 2. Give one important function of
this hormone.
(iii) Name the endocrine part of the numbered 3.
(iv) Why is the part labelled I called the master gland? Which part of the
forebrain controls the gland labelled I?
(v) Name the gland that secretes the ‘emergency hormone’.
(b) The diagram of an given below demonstrates a particular process in plants.
Study the same and answer the questions that follow : [5]
(i) Name the apparatus.
(ii) Which phenomenon is demonstrated by this apparatus?
(iii) Explain the phenomenon mentioned in (ii) above.
(iv) State two limitations of using this apparatus.
(v) What is the importance of the air bubble in the experiment?
(vi) Name the structures in a plant through which the above process takes
place.
Question 4
(a)
(i) Draw a well labelled diagram of the membranous labyrinth found in the
inner car. [5]
(ii) Based on the diagram drawn above in (i) give a suitable term for each of
the following descriptions :
1. The sensory cells that helps in hearing.
2. The part that is responsible for static balance of the body.
3. The membrane covered opening that connects the middle car to the
inner car.
4. The fluid present in the middle chamber of cochlea.
5. The structure that maintains dynamic equilibrium of the body.
(b) Give the Biological/technical term for the following: [5]
(i) Complete stoppage of menstrual cycle in females.
(ii) Pigment providing colour to urine.
(iii) The vein which drains the blood from the intestine to the liver.
(iv) The canal through which the testes descend into the scrotum just before
the birth of a male baby.
(v) The process causing an undesirable change in the environment.
(vi) The removal of nitrogenous wastes from the body.
(vii) The repeating components of each DNA strand lengthwise.
(viii) An alteration in the genetic material that can be inherited.
(ix) The process of uptake of mineral ions against the concentration gradient
using energy from the cell.
(x) Blood vessels carrying blood to the left atrium.
Question 5
(a) The given diagram shows a stage during mitotic division in an animal cell : [5]
(i) Identify the stage. Give a reason to support your answer.
(ii) Draw a neat labelled diagram of the cell as it would appear in the next
stage. Name the stage.
(iii) In what two ways is mitotic division in an animal cell different from the
mitotic division in a plant cell?
(iv) Name the type of cell division that occurs during :
A. Growth of a shoot
B. Formation of pollen grains.
(b) Give scientific reasons for the following statements : [5]
(i) Colour blindness is more common in men than in women.
(ii) Injury to medulla oblongata leads to death.
(iii) When an ovum gets fertilized, menstrual cycle stops temporarily in a
woman.
(iv) Mature erythrocytes in humans lack nucleus and mitochondria.
(v) Blood flows in arteries in spurts and is under pressure.
Question 6
(a) The diagram given below is that of a developing human foetus. Study the
diagram and then answer the questions that follow: [5]
(i) Label the parts numbered 1 to 3 in the diagram.
(ii) Mention any two functions of the part labelled 2 in the diagram.
(iii) Explain the significance of the part numbered 3 in the diagram.
(iv) Define the term ‘Gestation’. What is the normal gestational period of the
developing human embryo?
(v) Mention the sex chromosomes in a male and female embryo.
(b) The following diagram demonstrates a physiological process taking place in
green plants. The whole set up was placed in bright sunlight for several
hours. Study the diagram and answer the questions that follow : [5]
(i) What aspect of the physiological process is being examined?
(ii) Explain the physiological process mentioned in (i) above.
(iii) Label the parts numbered 1 and 2 in the diagram.
(iv) Write a well-balanced chemical equation for the physiological process
explained in (ii) above.
(v) What would happen to the rate of bubbling of the gas if a pinch of
sodium bicarbonate is added to the water in the beaker? Explain your
answer.
Question 7
(a) A homozygous tall plant (T) bearing red coloured (R) flowers is crossed with
a homozygous dwarf (t) plant bearing white (r) flowers :- [5]
(i) Give the genotype and phenotype of the plants of F1 generation.
(ii) Mention the possible combinations of the gametes that can be obtained
from the F1 hybrid plant.
(iii) State the Mendel’s law of Independent Assortment.
(iv) Mention the phenotypes of the off springs obtained in F2 generation.
(v) What is the phenotypic ratio obtained in F2 generation?
(b) Briefly explain the following terms: [5]
(i) Reflex action
(ii) Power of accommodation
(iii) Photophosphorylation
(iv) Hormone
(v) Synapse
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