Which of the following nitrogenous wastes is most toxic form and requires a lot of water for removal?

1. Ammonia

2. Urea

3. Uric acid

4. Creatinine

Which of the following nitrogenous wastes is least toxic?

1. Uric Acid

2. Urea

3. Creatinine

4. Ammonia

Ammonotelic organisms are not

1. Bony Fishes

2. Aquatic Amphibians

3. Aquatic Insects

4. Marine fishes

Ammonotelic organisms excrete out

1. Ammonia

2. Ammonium ions

3. Ammonium sulfate

4. Ammonium nitrate

Ammonia is converted into urea in which of the following organs of Ureotelic organisms?

1. Liver

2. Kidney

3. Urinary bladder

4. Gut

Kidney matrix retains some amount of urea to

1. Maintain a desired osmolarity

2. Maintain metabolism

3. Maintain balance of the body

4. Maintain micturition

Which of the following is not uricotelic?

1. Reptiles

2. Birds

3. Land snails

4. All insects

The invertebrates have which of the following excretory structures?

1. Simple Tubular forms

2. Complex tubular organs

3. Kidneys

4. Interstitial lamina

Which of the following has not the protonephridia as an excretory organ?

1. Rotifers

2. Amphioxus

3. Planaria

4. Earthworm

Which of the following is not the primary function of protonephridia?

1. Ionic volume regulation

2. Fluid volume regulation

3. Osmoregulation

4. Excretion