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Q. No.Subtopic: Nitrogenous Excretory Products |
76%
Level 2: 60%+
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The most toxic nitrogenous metabolic waste product is:
| 1. ammonia | 2. urea |
| 3. uric acid | 4. methane |
Subtopic: Nitrogenous Excretory Products |
95%
Level 1: 80%+
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Uricotelic mode of passing out nitrogenous wastes is found in
| 1. | reptiles and bird | 2. | birds and annelids |
| 3. | amphibians and reptiles | 4. | insects and amphibians |
Subtopic: Nitrogenous Excretory Products |
85%
Level 1: 80%+
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Subtopic: Nitrogenous Excretory Products |
79%
Level 2: 60%+
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Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R):
| Assertion (A): | Many amphibians excrete mainly ammonia when they are aquatic tadpoles and switch largely to urea excretion when they become land dwelling adults. |
| Reason (R): | The main disadvantage of urea is its energy cost and the main advantage is its low toxicity. |
In the light of the above statements choose the correct answer from the options given below
| 1. | Both (A) and (R) are True and (R) is the correct explanation of (A). |
| 2. | Both (A) and (R) are True but (R) is not the correct explanation of (A). |
| 3. | (A) is True but (R) is False. |
| 4. | Both (A) and (R) are False. |
Subtopic: Nitrogenous Excretory Products |
52%
Level 3: 35%-60%
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All the following animals are uricotelic except:
| 1. Reptiles | 2. Land snails |
| 3. Birds | 4. Marine fishes |
Subtopic: Osmoregulation |
90%
Level 1: 80%+
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Protonephridia are the excretory structures in all the following except:
| 1. Planaria | 2. Rotifers |
| 3. Amphioxus | 4. Prawns |
Subtopic: Osmoregulation |
77%
Level 2: 60%+
Hints
Match each item in Column-I with one in Column-II and select the correct match from the codes given:
Codes:
| Column-I [Organism] |
Column-II [Osmoregulatory and excretory structure] |
||
| A. | Flatworms, rotifers, Amphioxus | P. | Protonephridia |
| B. | Earthworm | Q. | Nephridia |
| C. | Insects | R. | Malpighian tubule |
| D. | Prawn | S. | Green gland or antennal gland |
| A | B | C | D | |
| 1. | P | Q | R | S |
| 2. | Q | R | S | P |
| 3. | R | S | P | Q |
| 4. | S | P | Q | R |
Subtopic: Nitrogenous Excretory Products |
93%
Level 1: 80%+
Hints
Identify the correct statements:
1. Only I and II
2. Only I and III
3. Only II and III
4. I, II and III
| I: | Cartilaginous fishes are ammonotelic. |
| II: | Mammals are ureotelic. |
| III: | Land snails are uricotelic. |
2. Only I and III
3. Only II and III
4. I, II and III
Subtopic: Nitrogenous Excretory Products |
62%
Level 2: 60%+
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A combination of flame cell and a tube cell, a protonephridium, is the osmoregulatory and excretory structure in:
| 1. | Platyhelminthes | 2. | Annelids |
| 3. | Aschelminthes | 4. | Echinoderms |
Subtopic: Nitrogenous Excretory Products |
85%
Level 1: 80%+
Please attempt this question first.
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