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Q. No.The main nitrogenous waste product of insects and birds is
| 1. | urea | 2. | uric acid |
| 3. | ammonia | 4. | carbon dioxide |
Subtopic: Nitrogenous Excretory Products |
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Subtopic: Nitrogenous Excretory Products |
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Match the excretory structures in Column-I with the organisms in Column-II:
Options:
1. A-P, B-Q, C-S, D-R
2. A-Q, B-S, C-R, D-P
3. A-S, B-R, C-P, D-Q
4. A-R, B-P, C-Q, D-S
| Column-I (Structure) | Column-II (Organism) | ||
| A. | Nephridia | P. | Insects |
| B. | Malpighian Tubules | Q. | Vertebrates |
| C. | Kidneys | R. | Earthworms |
| D. | Flame Cells | S. | Flatworms |
1. A-P, B-Q, C-S, D-R
2. A-Q, B-S, C-R, D-P
3. A-S, B-R, C-P, D-Q
4. A-R, B-P, C-Q, D-S
Subtopic: Nitrogenous Excretory Products |
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Match each item in Column I with one in Column II and select the correct match from the codes given:
Codes:
| Column I | Column II | ||
| A | Protonephridia | P | Prawn |
| B | Nephridia | Q | Cockroach |
| C | Malpighian tubules | R | Earthworm |
| D | Green gland | S | Amphioxus |
| A | B | C | D | |
| 1. | S | R | Q | P |
| 2. | S | R | P | Q |
| 3. | P | Q | S | R |
| 4. | Q | P | R | S |
Subtopic: Nitrogenous Excretory Products |
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Terrestrial organisms, like mammals, adapted to excrete urea instead of ammonia primarily because:
| 1. | Ammonia can be stored for long periods in the body without toxicity. |
| 2. | Urea requires less water for excretion compared to ammonia, conserving water. |
| 3. | Urea can be excreted directly from the skin without using the kidneys. |
| 4. | Urea is more toxic than ammonia and requires less energy to produce. |
Subtopic: Nitrogenous Excretory Products |
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Urea is a preferred nitrogenous waste product over ammonia because:
| 1. | It is produced more rapidly than ammonia in metabolism. |
| 2. | It is less toxic and requires less water for excretion. |
| 3. | It requires no energy for synthesis. |
| 4. | It does not affect blood pH. |
Subtopic: Nitrogenous Excretory Products |
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Uricotelic organisms are advantageous in xeric environments because:
| 1. | They excrete ammonia through gills |
| 2. | Uric acid dissolves readily in plasma |
| 3. | Uric acid is excreted in solid form with minimum water loss |
| 4. | Uric acid formation conserves sodium ions |
Subtopic: Nitrogenous Excretory Products |
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Uricotelism is found in
1. Fishes, and fresh protozoans.
2. Birds, reptiles and insects
3. Frogs, and toads
4. Mammals, and birds
Subtopic: Nitrogenous Excretory Products |
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Animals excreting nitrogen, mainly as ammonia, are mostly aquatic because ammonia:
| 1. | Can be stored safely in body fluids |
| 2. | Requires large amount of water for elimination |
| 3. | Is non-toxic, even in concentrated form |
| 4. | Is converted to urea before excretion |
Subtopic: Nitrogenous Excretory Products |
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If amount of water used form elimination of NH3, urea and uric aicd is X, Y and Z respectively, then which is correct?
1. X>Y>Z
2. X>Z>Y
3. X<Y<Z
4. Y>Z>X
Subtopic: Nitrogenous Excretory Products |
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