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Excretory Products and Their Elimination

Guanine is in...

Question

Guanine is insoluble in water. So it require low water for excretion.

What is the meaning of this line

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Solution

Spiders excrete almost exclusively a chemical called guanine. It is even less soluble as compared to uric acid and hence requires no water for elimination.

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Q. I have a doubt in URECOTELISM process. The concept says that the uric acid is insoluble in water and it requires the least amount of water for excretion. But how is that possible, i can't understand., how an insoluble substance needs less water than ammonia and urea?

Q. Conservation of water is possible in this mode of excretion

Q. A number of ionic compounds, e.g

A g C l, C a F_{2}, B a {S O}_{4}

are insoluble in water. This is because:

A

B e S O_{4} and M g S O_{4}

are insoluble in water.

R

B e^{2 +} and M g^{2 +}

posses low hydration enthalpies.

Q. Some animals excrete uric acid in urine (uricotelic) as it requires very little water. This is an adaptation to conserve water loss. Which animals among the following are most likely to be uricotelic?

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