Will geographical isolation be a major factor in the speciation of an organism that reproduces asexually? Why or why not?
Asexual reproduction occurs during the formation of two daughter cells from one parent only. There will be no variation when there is only one parent involved. And, where there is no variation speciation cannot occur. As in the self pollinating flowers geographical isolation is not the major factor in the speciation, this can also be seen in the case of asexual reproducing organisms. Where there is no variation, competition or genetic recombination, speciation will not occur and as well as geographical isolation will not occur because it refers to the separation of group of related organisms by some barriers.
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.
Outline a project which aims to find the dominant coat colour in dogs.
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.
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?
Why is variation beneficial to the species but not necessarily for the individual?
What are the limitations of the energy that can be obtained from the oceans?
Compare and contrast the arrangement of elements in Mendeléev’s Periodic Table and the Modern Periodic Table.
What are the differences between autotrophic nutrition and heterotrophic nutrition?
What are the qualities of an ideal source of energy?
How are fats digested in our bodies? Where does this process take place?
Why is the use of iodised salt advisable?
How do Mendel’s experiments show that traits are inherited independently?
Why is the amount of gas collected in one of the test tubes in Activity 1.7 double of the amount collected in the other? Name this gas.
A shiny brown coloured element ‘X’ on heating in air becomes black in colour. Name the element ‘X’ and the black coloured compound formed.
(a) Lithium, sodium, potassium are all metals that react with water to liberate hydrogen gas. Is there any similarity in the atoms of these elements?
(b) Helium is an unreactive gas and neon is a gas of extremely low reactivity. What, if anything, do their atoms have in common?