How are the areas of study – evolution and classification – interlinked?
Study of evolution and classification are interlinked. We can find the evolutionary relationships by identifying the hierarchy of the characteristics (these are the details of appearance and the behaviour) between the two species which shows the evolution. Classification shows the similarities among the two species which allows us to group them and then do the study of them, with the sharing of their common ancestor. The more similar characters are between two species, more closely they seem to be related with sharing of common ancestor. As shown in the given example in the book, A brother and sister are closely related, having the common ancestors before them, i.e, their parents. Their cousin and the girl are related but less if we compared them to the real brother and sister. This is due to cousins having common ancestors, their grandparents. That is how we can relate the classification of the species to the evolutionary relationship.
Outline a project which aims to find the dominant coat colour in dogs.
How is the sex of the child determined in human beings?
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?
How do Mendel’s experiments show that traits are inherited independently?
If a trait A exists in 10% of a population of an asexually reproducing species and a trait B exists in 60% of the same population, which trait is likely to have arisen earlier?
Explain how sexual reproduction gives rise to more viable variations than asexual reproduction. How does this affect the evolution of those organisms that reproduce sexually?
Explain the terms analogous and homologous organs with examples.
How do Mendel’s experiments show that traits may be dominant or recessive?
How does the creation of variations in a species promote survival?
Will geographical isolation be a major factor in the speciation of an organism that reproduces asexually? Why or why not?
Did Döbereiner’s triads also exist in the columns of Newlands’ Octaves? Compare and find out.
What is a good source of energy?
Why is diffusion insufficient to meet the oxygen requirements of multi-cellular organisms like humans?
What are trophic levels? Give an example of a food chain and state the different trophic levels in it.
What changes can you make in your habits to become more environment-friendly?
What is the difference between a reflex action and walking?
What is the importance of DNA copying in reproduction?
Why should a magnesium ribbon be cleared before burning in air?
Define the principal focus of a concave mirror.
You have been provided with three test tubes. One of them contains distilled water and the other two contain an acidic solution and a basic solution, respectively. If you are given only red litmus paper, how will you identify the contents of each test tube?
What changes can you make in your habits to become more environment-friendly?
Why are we looking at alternate sources of energy?
Explain the formation of scum when hard water is treated with soap.
How do auxins promote the growth of a tendril around a support?
You are given kerosene, turpentine and water. In which of these does the light travel fastest? Use the information given in Table 10.3.
Material medium |
Refractive index |
Material medium |
Refractive index |
Air | 1.0003 | Canada Balsam |
1.53 |
Ice | 1.31 | ||
Water | 1.33 | Rock salt | 1.54 |
Alcohol | 1.36 | ||
Kerosene | 1.44 | Carbon disulphide |
1.63 |
Fused quartz |
1.46 | ||
Turpentine oil |
1.47 | Ruby | 1.71 |
Benzene | 1.50 | Sapphire | 1.77 |
Crown glass |
1.52 | Diamond | 2.42 |
State Fleming’s left-hand rule.
Translate the following statements into chemical equations and then balance them.
(a) Hydrogen gas combines with nitrogen to form ammonia.
(b) Hydrogen sulphide gas burns in air to give water and sulpur dioxide.
(c) Barium chloride reacts with aluminium sulphate to give aluminium chloride and a precipitate of barium sulphate.
(d) Potassium metal reacts with water to give potassium hydroxide and hydrogen gas.
What are the problems caused by the non-biodegradable wastes that we generate?
An electric iron of resistance 20 Ω takes a current of 5 A. Calculate the heat developed in 30 s.
If a woman is using a copper -T, will it help in protecting her from sexually transmitted diseases?