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Recent questions tagged biology

List the various causes of variations in the progeny of a population. Describe the three different ways in which natural selection operates in nature, with regard to organic evolution.

asked Apr 14, 2019 by priyanka.clay6

1 answer

How did Darwin's theory of natural selection explain the appearance of new forms of life on earth?

asked Apr 14, 2019 by priyanka.clay6

1 answer

Rearrange the following in an ascending order of evolutionary tree, reptiles, salamander, lobefins, frogs. Name two reproductive characters that make reptiles more successful than amphibians.

asked Apr 14, 2019 by priyanka.clay6

1 answer

Explain adaptive radiation and convergent evolution by taking examples of some Australian marsupials and Australian placental mammals <br> OR <br> (a) What is adaptive radiation? <br> (b) Explain with the help of a suitable example, where adaptive radiation has occurred to represent convergent evolution.

asked Apr 14, 2019 by priyanka.clay6

1 answer

Name and explain the principle, the given equation represents : $p^2 + 2pq + q^2 = 1$

asked Apr 14, 2019 by priyanka.clay6

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Convergent evolution and divergent evolution are the two concepts explaining organic evolution. Explain each one with the help of an example.

asked Apr 14, 2019 by priyanka.clay6

1 answer

Branching descent and natural selection are the two key concepts of Darwinian theory of evolution. Explain each concept with the help of a suitable example.

asked Apr 14, 2019 by priyanka.clay6

1 answer

Study the schematic representation of evolutionary history of plant forms given below and mention: <br> a. The plant form Ferns and Conifers are most related to. <br> b. The nearest ancestors of flowering plants. <br> c. The most primitive group of plants. <br> d. Common ancestry Psilophyton provides to. <br> e. The common ancestors of Psilophyton and seed ferns. <br> f. The common ancestors of mosses and tracheophytes.

asked Apr 14, 2019 by priyanka.clay6

1 answer

Evolution is a change in the gene frequencies in a population in response to changes in the environment in a time scale of years and not centuries. Justify this statement with reference to DDT. How does the theory of Hugo de Vries support this?

asked Apr 14, 2019 by priyanka.clay6

1 answer

State the theory of abiogenesis. How does Miller's experiment support this theory? <br>OR<br> State the views of Oparin and Haldane on evolution. How does S.L. Miller's experiment support their views? <br> OR <br> Explain the theory of abiogenesis. How did Miller demonstrate experimentally the chemical evolution that happened three billion years ago? <br>

asked Apr 14, 2019 by priyanka.clay6

1 answer

Explain the increase in the numbers of melanic (dark-winged) moths in the urban areas of post-industrialisation period in England. OR <br> How does industrial melanism support Darwin's theory of Natural Selection? Explain.

asked Apr 14, 2019 by priyanka.clay6

1 answer

Anthropogenic action can hasten evolution. Explain with the help of a suitable example.

asked Apr 14, 2019 by priyanka.clay6

1 answer

What does the comparison between the eyes of Octopus and those of mammals say about their ancestry and evolution?

asked Apr 14, 2019 by priyanka.clay6

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How is genetic drift different from gene migration?

asked Apr 14, 2019 by priyanka.clay6

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How does 'fitness' of a population help in evolution?

asked Apr 14, 2019 by priyanka.clay6

1 answer

Give the sum total of all the allelic frequencies in a stable population. List any two factors which disturb the stability of a population. How does this disturbance affect the population?

asked Apr 14, 2019 by priyanka.clay6

1 answer

How is 'mutation' explained by Hugo de Vries different from the Darwinian variations?

asked Apr 13, 2019 by priyanka.clay6

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Why are the wings of butterfly and birds said to be analogous organs? Name the type of evolution, the analogous organs are a result of?

asked Apr 13, 2019 by priyanka.clay6

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Write Oparin and Haldane`s hypothesis about the origin of life on Earth. How does meteorite analysis favour this hypothesis?

asked Apr 13, 2019 by priyanka.clay6

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Convergent evolution leads to analogous structures. Explain with the help of an example.

asked Apr 13, 2019 by priyanka.clay6

1 answer

Divergent evolution leads to homologous structures. Explain with the help of an example.

asked Apr 13, 2019 by priyanka.clay6

1 answer

Categorise the following pairs of examples as convergent or divergent evolutions : <br>a. Eyes of Octopus and mammals. <br>b. Wings of butterfly and birds. <br> c. Tuber of sweet potatoes and potato. <br> d. Thorns in Bougainvillea and tendrils in Cucurbits.

asked Apr 13, 2019 by priyanka.clay6

1 answer

Name the ancestors of man based on the features given below : <br> a. Human-like meat eater with 900 cc brain lived in Java. <br> b. More human with brain size 1400 cc, lived in Central Asia, used hides and buried their dead. <br> c. Human-like, vegetarian, with brain capacity between 650 cc and 800 cc. <br> d. Man-like primate, that existed about 15 mya. Fossils found in Tanzania.

asked Apr 13, 2019 by priyanka.clay6

1 answer

How does palaeontological evidence support evolution of organisms on Earth?

asked Apr 13, 2019 by priyanka.clay6

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Write about the ancestry and evolution of bat, horse and human on the basis of a comparative study of their forelimbs. What are these limbs categorised as?

asked Apr 13, 2019 by priyanka.clay6

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List the two main propositions of Oparin and Haldane.

asked Apr 13, 2019 by priyanka.clay6

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How do Darwin's finches illustrate adaptive radiation?

asked Apr 13, 2019 by priyanka.clay6

1 answer

the term apiculture refers to

asked Apr 13, 2019 by ayaankhan1776

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Mention the type of evolution that has brought the similarity as seen in potato tuber and sweet potato.

asked Apr 13, 2019 by priyanka.clay6

1 answer

Pick out the ancestral line of Angiosperms from the list give below: Conifers, Seed ferns, Cycads, Ferns.

asked Apr 13, 2019 by priyanka.clay6

1 answer

List the two characteristics of mutation that help in explaining evolution according to De Vries.

asked Apr 13, 2019 by priyanka.clay6

1 answer

What did Louis Pasteur's experiments on 'killed yeast' demonstrate? <br>Name the theory that got disproved on the basis of his experiment.

asked Apr 13, 2019 by priyanka.clay6

1 answer

Identify the examples of convergent evolution from the following: <br> a. Flippers of penguins and dolphins. <br> b. Eyes of octopus and mammals<br> c. Vertebrate brains

asked Apr 13, 2019 by priyanka.clay6

1 answer

Mention what caused evolution according to de Vries. OR What causes speciation according to Hugo de Vries?

asked Apr 13, 2019 by priyanka.clay6

1 answer

Name the placental mammals corresponding to the Australian 'spotted cuscus' and 'Tasmanian tiger cat', which have evolved as a result of convergent evolution.

asked Apr 13, 2019 by priyanka.clay6

1 answer

Why are lichens regarded as pollution indicators?

asked Apr 13, 2019 by priyanka.clay6

1 answer

Are the thorns of Bougainvillea and tendrils of Cucurbita homologous or analogous? What type of evolution has brought such a similarity in them?

asked Apr 13, 2019 by priyanka.clay6

1 answer

Study the ladder of human evolution given above and answer the following questions : <br> a. Where did Australopithecines evolve ? <br> b. Write the scientific name of Java man.

asked Apr 13, 2019 by priyanka.clay6

1 answer

What does Hardy-Weinberg equation $p^2 + 2pq + q^2 = 1$, convey?

asked Apr 13, 2019 by priyanka.clay6

1 answer

When does a species become founders to cause founder effect?

asked Apr 13, 2019 by priyanka.clay6

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Coelacanth was caught in 1938 in South Africa. Why is it very significant in the evolutionary history of vertebrates?

asked Apr 13, 2019 by priyanka.clay6

1 answer

Comment on the similarity between the wing of a cockroach and the wing of a bird. What do you infer from the above with reference to evolution?

asked Apr 13, 2019 by priyanka.clay6

1 answer

Write the similarity between the wing of a butterfly and the wing of a bat. What do you infer from the above with reference to evolution?

asked Apr 13, 2019 by priyanka.clay6

1 answer

Identify the examples of homologous structures from the following: <br> a. Vertebrate hearts. <br> b. Thorns in Bougainvillea and tendrils of Cucurbita. <br> c. Food storage organs in sweet potato and potato.

asked Apr 13, 2019 by priyanka.clay6

1 answer

Write the formula to calculate allele frequency in future generations according to Hardy – Weinberg genetic equilibrium.

asked Apr 13, 2019 by priyanka.clay6

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Explain eutrophication.

asked Apr 13, 2019 by priyanka.clay6

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Write a note on sources of noise pollution and effect of noise pollution.

asked Apr 13, 2019 by priyanka.clay6

1 answer

Observe the following figure carefully and answer the questions that follow

asked Apr 13, 2019 by priyanka.clay6

1 answer

The less then 1% sunlight is present in which of the following zone

asked Apr 13, 2019 by ms0304208

1 answer

a)Why are catalytic convertors recommended for vehicles ? <br> b)Why should such vehicles use only unleaded petrol. <br> c)Why is CNG preferred to diesel as a fuel in vehicles.

asked Apr 13, 2019 by priyanka.clay6

1 answer

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