How do we compute the age of a fossil?

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(a)

The age of a fossil is calculated by radioactive (carbon) radiation.

Did aquatic life forms got fossilized? If yes, where do we come across such fossils?

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(a)

Yes, the aquatic life has more chances of being fossilised as their dead bodies are buried in the sedimentary rocks. We come across such fossils when the sedimentary rocks are exposed due to drastic changes in the crust of the earth.

How do we compute the age of a living tree?

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(a)

By determining the number of annual rings in the lower part of its trunk, called dendrochronology.

Give an example for convergent evolution and identify the features towards which they are converging.

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(a)

Sweet potato and potato tuber show convergent evolution because sweet potato is a fleshy adventitious root while potato tuber is an under-ground stem. They are both are fleshy due to storage of food. They are analogous organs and show phenomenon of analogy.

What is more important precondition for adaptive radiation?

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(a)

(i) Occurs in same geographical area.
(ii) Show by different members of same ancestor.
(iii) Radiated to different habitats and developed different habits.

How de we compute the age of a rock?

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(a)

By determining the quantity of uranium and lead in the rocks.

When we talk of functional macro-molecules e.g. protein as enzyme, hormones, receptor, antibodies, ect., towards what are they evolving?

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(a)

They are evolving towards different functions among diverse organism and evolving into complex organism.

Which source of variations denied to the asexually reproducing organisms and self-fertilising hermaphrodites? Which phenomenon needs to occur to bring about variation in such forms?

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(a)

Recombination of genes and hybridisation, mutation in genes and chromosomes.

Name any two breeds of wild rock pigeon that have been developed through artificial selection.

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(a)

Pouter, fan tail and jacobin.

What is the way to compute the age of a fossil?

1

(a)

Radiocarbon dating is one of the way to compute the age of a fossil.