Which of the following organs is NOT found in birds?

Urinary - bladder
Intestine
Liver
Kidney

LohaHridoy

4 views

2025-01-04 04:42

1 Answers

AhmedNazir

Option 1 : Urinary - bladder

Concept:

Explanation:

Excretion in birds

Birds do not have a urinary bladder.
Unlike mammals, birds do not have separate excrement and urine outputs.The cloaca eliminates both waste products at the same time.
Urine leaves the ureters and enters the cloaca, where it is pushed into the large intestine by reverse peristalsis, allowing excess water to be reabsorbed before evacuation.
This reabsorbed water is available to the bird and helps to compensate for birds' lower ability to concentrate urine as effectively as mammals.
The urine is thick and pasty, with a low water content but a high uric acid concentration due to nitrogen metabolism.
It is frequently passed as a paste and appears on some faeces as a whitish or cream cap.

Hence, the correct option is 'a'.

MODE OF EXCRETION

MODE OF EXCRETION	CHARACTERISTICS	EXAMPLES
Amnotelism	Nitrogenous waste is excreted in form of ammonia. Ammonia is highly basic in nature. so if any waste product containing ammonia is accumulated in the body. it may cause toxicity in the body of living organisms. Ammonia is highly soluble in water, so more amount is required to remove ammonia from the body of an organism.	All aquatic animals like Fish show amnotelism. These animals show continuous removal of ammonia from their body through their organs like gill slits & fins. As these organisms are aquatic they have plenty of water available. Thus amnotelism is possible in such organisms.
Ureotelism	Nitrogenous waste is excreted in form of Urea. Urea is less toxic than ammonia if it gets accumulated in the body of an animal. It does not show the toxic effect shown by ammonia. It also requires less water for its elimination via urine, so it does not need continuous elimination from the body of an organism.	Most of mammals including Humans show the ureotelic mode of excretion. These animals do not continuously excrete nitrogenous waste formed in their bodies. The removal of waste takes place from time to time (periodically).
Uricotelism	Uricotelism is the excretion of excess nitrogen in the form of uric acid.	Uricotelism is the excretion of excess nitrogen in the form of uric acid.

4 views Answered 2022-09-04 04:29

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