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Board Paper of Class 10 2015 Biology - Solutions

General Instructions:
Answer 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 paper is the time allotted for writing the answers.

Section I is compulsory. Attempt any four questions from Section II.
The intended marks of questions or parts of questions are given in brackets [ ].

  • Question 1
    (a) Name the following:
    (i) The process of uptake of mineral ions against the concentration gradient using
    energy from cell.
    (ii) The form in which glucose is stored in liver.
    (iii) The vein that carries oxygenated blood.
    (iv) The cross between two parents having one pair of contrasting characters.
    (v) The structure formed by the villi of the embryo and the uterus of the mother.
    [5]
    (b) The statements given below are false. Rewrite the correct form of the statement by
    changing the word which is underlined:
    (i) Alpha cells of pancreas secrete Insulin.
    (ii) Formalin is an example of an Antiseptic.
    (iii) CNG is mainly responsible for the formation of acid rain.
    (iv) Sulphadiazine is an example of an Antiseptic.
    (v) Cretinism is caused due to deficiency of Adrenaline.
    [5]
    (c) Choose the correct answer from the four options given below:
    (i) A single highly coiled tube where sperms are stored, gets concentrated and mature 
    is known as:
    A. Epididymis
    B. Vas efferentia
    C. Vas deferens
    D. Seminiferous tubule

    (ii) Chromosomes get aligned at the centre of the cell during:
    A. Metaphase
    B. Anaphase
    C. Prophase
    D. Telophase
     
    (iii) BCG vaccine is effective against
    A. Cholera
    B. Mumps
    C. Tuberculosis
    D. Measles
     
    (iv) Which one of the following is associated with the maintenance of posture?
    A. Cerebrum
    B. Cerebellum
    C. Thalamus
    D. Pons
     
    (v) An example of non-biodegradable waste is
    A. Vegetable peels
    B. Sewage
    C. Livestock waste
    D. DDT
    [5]
    (d) (d) Mention the exact location of the following structures:
    (i) Thylakoids
    (ii) Organ of Corti
    (iii) Lenticels
    (iv) Bicuspid value
    (v) Loop of Henle
    [5]
    (e) The diagram given below represents a certain stage of mitosis:

    (i) Identify the stage of cell division.
    (ii) Name the parts labelled A and B
    (iii) What is the unique feature observed in this stage?
    (iv) How many daughter cells are formed from this type of cell division?
    [5]
    (f) Given below is an example of a certain structure and its special functional activity.
    On a similar pattern fill in the blanks with suitable functions:
    Example: Chloroplast and photosynthesis
    (i) Xylem and _________________.
    (ii) Ciliary body and _________________.
    (iii) Seminiferous Tubule and _________________.
    (iv) Thyroid gland and _________________.
    (v) Eustachian Tube and _________________.
    [5]
    (g) Rewrite and complete the following sentences by inserting the correct word in the
    space indicated:
    (i) The phenomenon of loss of water through a cut stem or injured part of plant is
    called ___________.
    (ii) ___________ is the scientific name of garden pea, which Mendel used for his
    experiments.
    (iii) A fluid that occupies the larger cavity of the eye ball behind the lens is
      ___________.
    (iv) Oxygen combines with haemoglobin present in RBC and forms ___________.
    (v) ___________ causes corrosion of the marble or brick surface.
    [5]
    (h) Match the items in Column ‘A’ with those which are most appropriate in Column ‘B’.
    Rewrite the matching pairs as shown in the example:
    Example: Fibrinogen – Clotting of blood.
    Column A Column B
     (1) Allele  (a) Control of automobile exhaust
     (2) Leydig cells  (b) Tourniquet
     (3) Utriculus  (c) Alternate forms of genes
     (4) Snake bite  (d) Dynamic equilibrium
     (5) Euro IV norms  (e) Testosterone
       (f) Sudden change in genes
       (g) Static equilibrium
    [5]
    VIEW SOLUTION
  • Question 2
    (a) The diagram below shows two test-tubes A and B. Test-tube A contains a green
    water plant. Test-tube B contains both a green water plant and a snail. Both test tubes
    are kept in sunlight. Answer the questions that follow:
    (i) Name the physiological process that releases the bubbles of oxygen.
    (ii) Explain the physiological process as mentioned above in Q.2 (a) (i).
    (iii) What is the purpose of keeping a snail in test-tube ‘B’?
    (iv) Why does test-tube ‘B’ have more bubbles of oxygen?
    (v) Given an example of a water plant that can be used in the above process.
    (vi) Write the overall chemical equation for the above process.
    [5]
    (b) Give the biological/technical terms for the following:
    (i) A mixture of smoke and fog.
    (ii) Capacity of our body to resist disease.
    (iii) Fixing of developing zygote on the uterine wall.
    (iv) The permanent stoppage of menstruation at about the age of 45 years in a female.
    (v) The hormone increasing reabsorption of water by kidney tubules.
    (vi) A thin membrane covering the entire front part of the eye.
    (vii) The lens of eye losing flexibility resulting in a kind of long-sightedness in middle aged people.
    (viii) The number of persons living per square kilometre at any given time.
    (ix) The sound produced when the atrio-ventricular valves close in the heart.
    (x) The process by which white blood cells engulf bacteria.
    [5]
    VIEW SOLUTION
  • Question 3
    (a) An apparatus as shown below was set up to investigate a physiological process in plants. The setup was kept in sunlight for two hours. Droplets of water were then seen inside the bell jar. Answer the questions that follow:

    (i) Name the process being studied.
    (ii) Explain the process named above in Q.3(a) (i).
    (iii) Why was the pot covered with a plastic sheet?
    (iv) Suggest a suitable control for this experiment.
    (v) Mention two ways in which this process is beneficial to plants.
    (vi) List three adaptations in plants to reduce the above mentioned process.
    [5]
    (b) Briefly answer the following questions:
    (i) State two reasons for the increase of population in India.
    (ii) What is the significance of amniotic fluid?
    (iii) What is the function of ear ossicles?
    (iv) Mention any two activities of the WHO.
    (v) State Mendel’s law of Dominance.
    [5]
    VIEW SOLUTION
  • Question 4
    (a) The diagrams given below are cross sections of blood vessels:


    (i) Identify the blood vessels A, B and C.
    (ii) Name the parts labelled 1 to 3.
    (iii) Name the type of blood that flows through A.
    (iv) Mention one structural difference between A and B.
    (v) In which of the above vessels does exchange of gases actually take place?
    [5]
    (b) Differentiate between the following pairs on the basis of what is mentioned within brackets:
    (i) Diffusion and Osmosis (Definition)
    (ii) RBC and WBC (Shape)
    (iii) Tubectomy and Vasectomy (Part cut and tied)
    (iv) Vasopressin and Insulin (Deficiency disorder)
    (v) Rods and Cones of Retina (Type of pigment)
    [5]
    VIEW SOLUTION
  • Question 5
    (a) The diagram given below shows a section of human kidney.
    Study the diagram carefully and answer the questions that follow:


    (i) Label the parts numbered 1 to 4.
    (ii) Why does part ‘2’ have a striped appearance?
    (iii) What is the fluid that passes down part ‘4’?
    Name the main nitrogenous waste present in it.
    (iv) Mention the structural and functional units of kidneys.
    (v) Name the two major steps in the formation of the fluid mentioned in Q.5 (a)  (iii).
    [5]
    (b) Draw neat and labelled diagrams of the following:
    (i) Malpighian Capsule
    (ii) A Myelinated Neuron
    [5]
    VIEW SOLUTION
  • Question 6
    (a) The diagram given below shows the male urinogenital system of a human being.
    Study the diagram and answer the questions that follow:

    (i) Label the parts numbered 1 to 8.
    (ii) Name the corresponding structure of part (4) in female reproductive system.
    (iii) What is the role of part 7?
    [5]
    (b) In a homozygous plant round seeds (R) are dominant over wrinkled seeds (r):
    (i) Draw a Punnett square to show the gametes and offspring when both the
    plants have heterozygous round seeds (Rr).
    (ii) Mention the Phenotype and Genotype ratios of the offspring in F2 generation.
    (iii) Name the sex chromosomes in human males and females.
    (iv) Briefly explain the term ‘Mutation’.
    (v) What is the number of chromosomes in the gametes of human beings?
    [5]
    VIEW SOLUTION
  • Question 7
    (a) The diagram below represents the human heart in one phase of its function. Study the diagram carefully and answer the questions that follow:

    (i) Name the phase.
    (ii) Which part of the heart is contracting in this phase?
    Give a reason to support your answer.
    (iii) Name the parts labelled 1 to 4.
    (iv) What type of blood flows through ‘2’?
    (v) State the function of the part numbered ‘5’.
    (vi) Name the membrane that covers the heart.
    [5]
    (b) Explain the following terms:
    (i) Greenhouse effect
    (ii) Turgor pressure
    (iii) Selective reabsorption
    (iv) Natality
    (v) Pulse
    [5]
    VIEW SOLUTION
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