Outline a project which aims to find the dominant coat colour in dogs.
Dogs have different coats. In order to find dominant coat (hair) colour in dogs, select a pure- bred of male and female dog having black colour or pure- bred of male and female having brown colour. Cross the homozygous male BB and homozygous female bb, and then observe the coat colour in dog progeny (offspring). If all progeny have black colour, this means that black colour will be the dominant coat colour in dogs and if progeny will have brown colour then the brown colour will be dominant coat colour.
And, by making the punnett square of F1 generation, we will get Bb, Bb, Bb, Bb ,i.e, all progeny are showing the black colour. So, it is concluded that the dominant colour is black.
When a 12 V battery is connected across an unknown resistor, there is a current of 2.5 mA in the circuit. Find the value of the resistance of the resistor.
Draw the structure for the following compounds.
(i) Ethanoic acid (ii) Bromopentane*
(iii) Butanone (iv) Hexanal.
*Are structural isomers possible for bromopentane?
A hot plate of an electric oven connected to a 220 V line has two resistance coils A and B, each of 24 Ω resistance, which may be used separately, in series, or in parallel. What are the currents in the three cases?
How is the sex of the child determined in human beings?
(a) What property do all elements in the same column of the Periodic Table as boron have in common?
(b) What property do all elements in the same column of the Periodic Table as fluorine have in common?
Calculate the number of electrons constituting one coulomb of charge.
What is an homologous series? Explain with an example.
Why is variation beneficial to the species but not necessarily for the individual?
A man with blood group A marries a woman with blood group O and their daughter has blood group O. Is this information enough to tell you which of the traits – blood group A or O – is dominant? Why or why not?
Give an example of a metal which
(i) is a liquid at room temperature.
(ii) can be easily cut with a knife.
(iii) is the best conductor of heat.
(iv) is a poor conductor of heat.
What is a good source of energy?
Explain the following terms with one example each.
(a) Corrosion
(b) Rancidity
Why do you think that there should be equitable distribution of resources? What forces would be working against an equitable distribution of our resources?
In the electrolytic refining of a metal M, what would you take as the anode, the cathode and the electrolyte?
Define the following terms.
(i) Mineral (ii) Ore (iii) Gangue
Which one of the following types of medicines is used for treating indigestion?
(a) Antibiotic
(b) Analgesic
(c) Antacid
(d) Antiseptic
Give a test that can be used to differentiate between saturated and unsaturated hydrocarbons.
What advantage over an aquatic organism does a terrestrial organism have with regard to obtaining oxygen for respiration?
Would you be able to check if water is hard by using a detergent?
A convex lens forms a real and inverted image of a needle at a distance of 50 cm from it. Where is the needle placed in front of the convex lens if the image is equal to the size of the object? Also, find the power of the lens.