Board Paper of Class 10 2015 Biology - Solutions

• Question 16
  Identical twins are syngeneic with similar chromosomal contents. Natural clones are those who possess identical chromosomes.
  Fill up with the suitable word given in the brackets.
  (a) Identical twins are __________.

  (natural clones/identical clones)

  (b) Identical twins are __________.

  (dissimilar to each other/similar to each other)

  VIEW SOLUTION

• Question 17
  Match the following vitamins with their deficiency diseases.
   

  Sl. No.	Vitamins	Deficiency diseases
  1	Vitamin A	Beri beri
  2	Vitamin B1	Scurvy
  3	Vitamin C	Rickets
  4	Vitamin D	Nyctalopia

  VIEW SOLUTION

• Question 18
  
  
  
  This diagram is of a human brain and the functions of different parts are given below. Mark A and B in the parts of the brain corresponding with the function.
  (A) Seat of smell
  (B) Seat of vision VIEW SOLUTION

• Question 19
  Based on relationship fill in the blanks.-
  Thyroxin : personality hormone
  Adrenaline : __________ VIEW SOLUTION

• Question 20
  Correct the statements if they are wrong.
  (a) Alpha cells produce insulin and beta cells produce glucagon.
  (b) Ovary produces eggs and Androgen. VIEW SOLUTION

• Question 21
  
  
  Redraw the diagram and label the following parts :
  (a) Exine
  (b) Tube nucleus VIEW SOLUTION

• Question 22
  Based on relationship, fill up :
  Whale : Baleen plates
  Bat : __________. VIEW SOLUTION

• Question 23
  
  
  Draw the diagram and label any two parts mentioned below :
  (a) Bowman's capsule
  (b) Glomerulus
  (c) Loop of Henle
  (d) Collecting duct VIEW SOLUTION

• Question 24
  Fill in the blanks.
  (a) Plasma : Fibrinogen ; RBC : __________.
  (b) WBC : __________. VIEW SOLUTION

• Question 25
  Pick the odd one out.
  The parts of the alimentary canal are :
  (Pharynx, Mouth, Buccal Cavity, Pancreas) VIEW SOLUTION

• Question 26
  Study the food chain below, correct it and convert into a pyramid of energy.
  Mulberry → Sparrow → Caterpillar → Kite VIEW SOLUTION

• Question 27
  A non-renewable resource is a natural resource if it is replaced by natural process at a rate of consumption by human.
  
  Read this statement and confirm whether it is correct or incorrect. If it is incorrect give the correct statement. VIEW SOLUTION

• Question 28
  The Pie diagram represents a survey result of infectious diseases of a village during 2008 - 2009.
  Analyse it and answer the following questions.
  
  
  
  (a) Which diseases affect the majority of the population?
  (b) How are these diseases transmitted? VIEW SOLUTION

• Question 29
  Pick out the suitable appliances to conserve the electric energy.
  (Fluorescent bulbs, copper choke, solar water heater, electric water heater, tungsten bulbs, electronic choke.) VIEW SOLUTION

• Question 30
  Distinguish between the true solution and colloidal solution. VIEW SOLUTION

• Question 31
  Find the concentration of solution in terms of weight percent if 20 grams of common salt is dissolved in 50 grams of water. VIEW SOLUTION

• Question 32
  From the given examples form the pair of isotopes and the pair of isobars.
  ${18}^{{\mathrm{Ar}}^{40}}, {17}^{{\mathrm{Cl}}^{35}}, {20}^{{\mathrm{Ca}}^{40}}, {17}^{{\mathrm{Cl}}^{37}}$ VIEW SOLUTION

• Question 33
  What type of chemical reaction takes place when :
  (a) lime stone is heated
  (b) a magnesium ribbon is burnt in air. VIEW SOLUTION

• Question 34
  Match the following :
   

  Sl. No.	Source	Acid present
  1	Apple	Oxalic acid
  2	Lemon	Tartaric Acid
  3	Grape	Malic Acid
  4	Tomato	Citric acid

  VIEW SOLUTION

• Question 35
  Iron reacts with Con. HCl and Con. H₂SO₄. But it does not react with Con. HNO₃. Suggest your answer with proper reason. VIEW SOLUTION

• Question 36
  Write any two uses of Aluminium. VIEW SOLUTION

• Question 37
  Match the following compounds with their functional groups :
   

  SI. No.	Compounds	Functional Groups
  1	Alcohol	> C = O
  2	Aldehyde	–OH
  3	Ketone	–COOH
  4	Carboxylic acid	–CHO

  VIEW SOLUTION

• Question 38
  Fill in the blanks.
  (a) Force = mass × acceleration, then momentum = __________ ? __________.
  (b) Liquid hydrogen is for rocket, then __________  is for MRI. VIEW SOLUTION

• Question 39
  From the following statements write down that which is not applicable to mass of an object.
  (a) It is a fundamental quantity.
  (b) It is measured using physical balance.
  (c) It is measured using spring balance. VIEW SOLUTION

• Question 40
  Calculate the energy produced when 1 kg of substance is fully converted into energy.
  (Note : c = 3 × 10⁸ ms^–1) VIEW SOLUTION

• Question 41
  Correct the mistakes, if any in the following statements :
  (a) A good source of energy would be one which does a small amount of work per unit volume of mass.
  (b) Any source of energy we use to do work is consumed and can be used again. VIEW SOLUTION

• Question 42
  Draw the schematic diagram of an electric circuit consisting of a battery of two cells of 1.5 V each, three resistance of 5 ohm, 10 ohm and 15 ohm respectively and a plug key all connected in series. VIEW SOLUTION

• Question 43
  Correct the mistakes, if any, in the following statements :
  (a) Magnetic field is a quantity that has magnitude only.
  (b) The magnetic field lines emerge from the south pole and merge at the north pole. VIEW SOLUTION

• Question 44
  From the following description write down the names of the parts in human eye.
  (a) Dark muscular diaphragm that controls the pupil.
  (b) The screen where the image is formed by eye lens. VIEW SOLUTION

• Question 45
  You know that myopia is a common refractive defect of vision. Person with this defect can see only nearby objects clearly. Using concave lens of suitable power this defect is corrected.
  (a) Mention other two types of defects like this.
  (b) Explain how we can correct it. VIEW SOLUTION

• Question 46
  What are the various applications of Bio Technology. Explain. VIEW SOLUTION

• Question 47
  There is a widespread outbreak of malaria in your area.
  (a) Suggest some controlling measures to the local authorities concerned.
  (b) Pick out the right symptom for malaria.

  (Chill and Shiver and a rise in temperature, Diarrhoea)

  VIEW SOLUTION

• Question 48
  Write the two events involved in the sexual reproduction of flowering plants.
  (a) Discuss the first event and write the types
  (b) Give advantages and disadvantages of that event. VIEW SOLUTION

• Question 49
  In your area there is, scarcity of water and due to this people are affected. So, what are the measures to be taken by you to meet out the scarcity of water. VIEW SOLUTION

• Question 50
  (a) Calculate the gram molecular mass of water from the values of gram atomic mass of hydrogen and of oxygen.

  Gram atomic mass of hydrogen =1 g
  Gram atomic mass of oxygen=16 g

  (b) Atoms and molecules are the building blocks of matter. List out any three differences between them. VIEW SOLUTION

• Question 51
  Write the common name and IUPAC name of the following
  
  (a) CH₃CH₂CHO
  
  (b) CH₃COCH₃
  
  (c) $\begin{array}{ccccc}{\mathrm{CH}}_{\mathrm{3}}& –& \mathrm{CH}& –& {\mathrm{CH}}_{\mathrm{3}}\\ & & |& & \\ & & \mathrm{OH}& & \end{array}$
  
  (d) CH₃COOH
  
  (e) HCHO VIEW SOLUTION

• Question 52
  (a) Explain Newton's first law of motion with an example.
  
  (b) $\mathrm{F}=\frac{{\mathrm{Gm}}_1{\mathrm{m}}_2}{{\mathrm{d}}^2}$ is the mathematical form of Newton's law of gravitation.

  Give the statement of Newton's law of gravitation.

  VIEW SOLUTION

• Question 53
  (a) Draw and label the diagram given below :
   

  (i)	Incident ray	(ii)	Refracted ray
  (iii)	Emergent ray	(iv)	Angle of refraction
  (v)	Angle of deviation	(vi)	Angle of emergence

  
  

  
  (b) The refractive index of diamond is 2.42. What is the meaning of this statement in relation to speed of light? VIEW SOLUTION