Maximum Marks: 80
Time allowed: Two and half hours
Answers to this Paper must be written on the paper provided separately.
You will not be allowed to write during 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.
Section-A
(Attempt all questions from this Section.)
Question 1
Choose one correct answer to the questions from the given options:
(Do not copy the question,write the correct answers only)
(i) The Loops of Henle lie in
(a) Renal Cortex
(b) Renal Medulla
(c) Renal Pelvis
(d) Renal Artery
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Solution
(ii) The antiseptic present in tears:
(a) Iodine
(b) Hydrogen peroxide
(c) Lysozyme
(d) Lysosome
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Solution
(iii) Assertion (A): The foetus respires but does not breathe.
Reason (R): The maternal blood supplies oxygen to the foetus through placenta.
(a) A is True and R is False
(b) A is False and R is True
(c) Both A and R are True
(d) Both A and R are False
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Solution
(iv) During ventricular systole, the atrioventricular valves (P) ____
and semilunar valves (Q) _____
(a) P-close, Q— Open
(b) P-close, Q— Close
(c) P—open, Q- Close
(d) P—open, Q- Open
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Solution
(v) The two cerebral hemispheres are joined by a sheet of fibres called:
(a) Pons
(b) Corpus luteum
(c) Hypothalamus
(d) Corpus callosum
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Solution
(vi) The onset of menstruation in a human female is called:
(a) Menopause
(b) Menarche
(c) Ovulation
(d) Oogenesis
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Solution
(vii) Assertion (A): Rods and Cones are photoreceptors in the sclera of
eyeball.
Reason (R): Rods are sensitive to dim light.
(a) A is True and R is False.
(b) A is False and R is True.
(c) Both A and R are True.
(d) Both A and R are False.
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Solution
(viii) Priya tried to match the hormones with their effect on the human body.
She tabulated the pairs as follows:
Identify the correct pair of hormones.
(a) P-—Insulin, Q— Glucagon.
(b) P-Adrenaline, Q-—- Oxytocin.
(c) P-—Glucagon, Q—- Vasopressin.
(d) P-—Vasopressin, Q— Adrenaline.
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Solution
(ix) While studying the stages in the evolution of man, a well-developed chin
is observed in
(a) Homo habilis
(b) Homo erectus
(c) Homo sapiens
(d) Australopithecus
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Solution
(x) A pair of corresponding chromosomes of the same shape, size and one
from each parent is called:
(a) Autosomes
(b) Allosomes
(c) Analogous chromosomes
(d) Homologous chromosomes
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Solution
(xi) Assertion (A): We urinate more in summer.
Reason (R): Sweat glands are more active in summer.
(a) A is True and R is False
(b) A is False and R is True
(c) Both A and R are True
(d) Both A and R are False
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Solution
(xii) Rahul inserted a hairpin into his right ear to remove ear wax. He felt a
sudden sharp pain with loss of hearing. This was due to:
(a) Rupture of eardrum
(b) Rupture of vestibule
(c) Rupture of cornea
(d) Rupture of pinna
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Solution
(xiii) Assertion (A): All food chains begin with herbivores.
Reason (R): Green plants are heterotrophs.
(a) A is True and R is False
(b) A is False and R is True
(c) Both A and R are True
(d) Both A and R are False
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Solution
(xiv) A biology teacher asked her students to give two examples of vestigial
organs in the human body.
Raj said: Wisdom teeth and Pinna
Sonu said: Body hair and large intestine
Lata said: Vermiform appendix and wisdom teeth
Abhay said: Pinna and Ossicles
Who were correct?
(a) Abhay and Sonu
(b) Sonu and Lata
(c) Raj and Lata
(d) Abhay and Raj
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Solution
(xv) During a practical exam, a plant cell in a particular solution was placed
under a compound microscope. Students were told to observe the cell and
name the tonicity of the solution and mention the process that occurred
in the cell.
(a) Isotonic, Endosmosis
(b) Hypotonic, Active Transport
(c) Hypertonic, Endosmosis
(d) Hypertonic, Exosmosis
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Solution
Question 2
(i) Name the following:
(a) The basic units of heredity.
(b) The undesirable change in the environment leading to its
deterioration.
(c) The structure that connects placenta and the human foetus.
(d) The statistical study of human population.
(e) The nitrogenous base that pairs with adenine.
(ii) Given below is the transverse section of the spinal cord. Read the
information below the diagram and fill in the blanks:
The spinal cord extends from the medulla oblongata of the brain and runs
down through the whole length of the vertebral column. The spinal cord
is covered by the meninges. It conducts impulses from the skin and
muscles to the brain. It also conducts impulses from the brain to the
muscles of the trunk and limbs.
The spinal cord is a part of the (a) ____ Nervous System. The
grey matter in the picture given above consists of (b) ____ while
the white matter consists of (c) _____ . The spinal cord is concerned
with the (d) ____ actions below the neck. (e) ___ is the bony structure that protects the spinal cord.
(iii) Arrange and rewrite the terms in each group in the correct order so as to be in a logical sequence beginning with the term that is underlined.
(a) Apical meristem, Positive phototropism, Auxins, Cell elongation.
(b) Urethra, Urinary bladder, Ureter, Kidney.
(c) Auditory canal, Organ of Corti, Stapes, Malleus.
(d) Cell membrane, Chromatin fibres, Cell wall, Cytoplasm.
(e) Lungs, Right auricle, Inferior venacava, Pulmonary Artery.
(iv) Read the explanations given below and name the structure:
Example: The largest gland in the human body that secretes bile.
Answer: Liver.
(a) Food conducting tissue in vascular plants.
(b) Acell formed by the fusion of gametes.
(c) The smallest blood vessels in the human body.
(d) A tubular passage that connects the pharynx and the middle ear.
(e) The openings on the barks of trees through which transpiration
occurs.
(v) Given below is a cross section of the human eye. Match the structures
marked (a) to (e) with their correct functions:
Example: (f) - 6. Holds the lens in position
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Solution
Section-B
(Attempt any four questions from this Section.)
Question 3
(i) Explain the term — Active transport.
(ii) Name the structures through which Transpiration and Guttation occur in
a plant.
(iii) How does the rate of Transpiration differ when there is:
(a) High temperature
(b) High humidity
(iv) Write the overall chemical equation for Photosynthesis.
(v) Sam observed a slide containing the lower epidermis of a leaf under a
microscope. A number of tiny openings between the epidermal cells
were present as shown below in the diagram:
(a) What are these tiny openings called?
(b) Name the cells that regulate the opening and closing of the:
structures.
(c) Which ion is responsible for the opening and closing of the:
openings?
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Solution
Section-B
(Attempt any four questions from this Section.)
Question 4
(i) Why is Adrenaline called ‘The Emergency Hormone’?
(ii) Expand the abbreviation — ADH. Give one example of a diuretic
substance.
(iii) Mention the significance of the following minerals:
(a) Iodine in our food.
(b) Magnesium for green plants.
(iv) State two objectives of Swachh Bharat Abhiyan.
(v) Draw a neat, labelled diagram of a root hair.
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Solution
Question 5
(i) Mention one characteristic of roots for absorbing water from the soil.
(ii) What is Parthenocarpy? Give one example.
(iii) State the difference between Micturition and Parturition.
(iv) Write any two functions of Lymph.
(v) Study the picture given below and answer the questions:
(a) How does water get polluted?
(b) What is the effect of water pollution on human life?
(c) Mention one control measure to stop the pollution of water bodies.
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Solution
Question 6
(i) State Mendel’s Law of Segregation
(ii) What are Tropic hormones? Give one example
(iii) Differentiate between the terms Phenotype and Genotype
(iv) What is the significance of Testes being placed in Scrotal sacs?
(v) Draw a neat, labelled diagram of a human sperm.
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Solution
Question 7
(i) What is the scientific name of the pea plant that Mendel used for his
experiments?
(ii) Mention the surgical methods of contraception in:
(a) Men
(b) Women
(iii) Name two harmful effects of noise pollution.
(iv) Which parts of a plant exhibit:
(a) Negative Geotropism
(b) Positive Hydrotropism
(v) Kathak is an Indian classical dance which involves a lot of spinning by
the dancers. The learners of this dance experience dizziness in the
beginning while spinning.
(a) Name the part of the membranous labyrinth responsible for this
dizziness.
(b) Give a suitable reason for your answer.
(c) Mention the nerve that carries the impulse for dizziness to the brain.
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Solution
Question 8
(i) How does Transpiration help in the uptake of water from the soil?
(ii) Given below are two statements which are incorrect. Rewrite the correct
statements:
(a) Fresh water fish when placed in hypertonic salt solution absorb
water and burst.
(b) Seminiferous tubules secrete Testosterone.
(ili) During Mitosis what is the position of chromatids in:
(a) Metaphase
(b) Anaphase
(iv) Chris was watching the display of fireworks in the sky.
(a) Trace the path of the light rays using the following terms:
Fovea, Lens, Conjunctiva, Pupil, Cornea
(b) Name the nerve that carries the impulse for vision to the brain.
(v) Draw a neat, labelled diagram of a Malpighian Capsule.
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Solution