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Auxin

Who isolated ...

Question

Who isolated auxins from tips of coleoptiles of oat seedlings?

A

Darwin and Darwin

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B

Went

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C

Skoog et al.

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D

Kurosawa

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Solution

The correct option is B Went
Isolation of awdns from tips of coleoptiles of oat seedlings is based upon Avena coleoptile curvature test. This experiment was devised by F.W. Went (1926). It is based on the quick polar transport of auxin, downwards in Avena coleoptile.The result will be differential growth and formation of curvature. Degree of curvature is almost proportional to the concentration of auxin.

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Q. Scientists who isolated auxins from the coleoptiles of Avena and from human urine are _________ respectively.

Q. Assertion :Auxin was isolated by F.W. Went from the tips of coleoptiles of wheat seedlings. Reason: Ethylene delays the senescence.

Q. State whether the following statements are true or false.
Went's experiment in 1926 with oat coleoptiles showed that agar that absorbed auxin from the tips would cause a tipless shoot to grow away from the side where he had placed. the agar, suggesting that auxin causes cells to elongate.

Q. Read the given statements and select the correct option.
(i) Darwin and Darwin (1880) found that sensation of unilateral illumination was perceived by the coleoptile tip of canary grass.
(ii) IAA is universal natural auxin, discovered by Kogl et al.
(iii) IBA is both natural and synthetic auxin.
(iv) Auxins promote the growth of lateral shoots.

Q. Describe an experiment that would demonstrate that growth stimulating hormone is produced at the tip of oat coleoptile.

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