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Hormones in Plants and Animals.

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Hormones in Plants and Animals.

Postby vlc1500 » Sun Jan 07, 2007 12:42 am

Hi, im having trouble with a question.

Both plants and animals
a) have special tissues or glands for producing hormones.
b) have some hormones involved in the control of growth and development.
c) cease producing hormones at sexual maturity
d. use their vascular systems to transmit essentially all of their hormones within their bodies
e) two of the above are true
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Postby asutoshsahu » Sun Jan 07, 2007 3:20 am

(a) and (b) are true i.e choice e
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Postby vlc1500 » Sun Jan 07, 2007 4:54 pm

Hi, i got just one more question

Which of the following statements about hormones is false?
a. Hormones are broadcast only to specific target cells.
b. Hormones are secreted in minute quantities.
c. hormones generally have longer lasting effects than nervous impulses.
d.Hormoes are slower acting than nervous impulses
e. Hormonal Systems occur in both plants and animals.
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Postby MrMistery » Sun Jan 07, 2007 7:19 pm

a
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Postby blazblazni » Sun Jan 07, 2007 11:03 pm

well a) is kind ot true as well. Only the cells with the appropriate receptors can recieve hormones (target cells) so they are broadcast to only specific cells. That is my opinion anyway.
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Postby sachin » Mon Jan 08, 2007 5:57 am

blazblazni wrote:well a) is kind ot true as well. Only the cells with the appropriate receptors can recieve hormones (target cells) so they are broadcast to only specific cells. That is my opinion anyway.


Me too.... Hormones affect on specific cells not all....

eg FSH.... to gonads.... not to Urinary system...
ADH ..... to Urinary system... not to Gonads...
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Postby Dr.Stein » Mon Jan 08, 2007 10:58 am

C

Because hormone is secreted in pulsatory method or when there is a signal/order to secrete, then the effect only can be seen/felt when the hormone is around.

After some period, the hormone will be inactivated in liver to anticipate excessive endogenous hormone and too much effect/expression.
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Postby Doc44 » Sat Jan 13, 2007 5:11 am

Hormones when secreated go everwhere.... not just to a specific cell or tissue, but specific hormones influence specific target cells or tissues. FSH affects graffin follicles not melanocytes.

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What is an auxin?
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Postby sachin » Sat Jan 13, 2007 6:49 am

Auxin is plant growth hormone...
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Postby Doc44 » Sat Jan 13, 2007 11:48 pm

Do plants have auxins and hormones?

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Postby Linn » Sun Jan 14, 2007 2:25 am

Yes
Auxins are plant hormones which regulate growth.
as pointed out by Sachin.

Also with plants, how much hormone released results in different effects.
For example increase or inhibit growth..
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Postby sachin » Sun Jan 14, 2007 5:36 am

ANd May be species dependant... :?
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