Answer :

(a) The aquatic organisms depend only on the oxygen present in the dissolved form in the water body. Since the amount of dissolved oxygen is fairly low compared to the amount of oxygen in the air, the rate of breathing in aquatic organisms is much faster than that seen in terrestrial organisms.


Human Respiratory System


a. The organs of the Human Excretory System are

1. A pair of Kidneys

2. A pair of Ureters

3. Urinary Bladder

4. Urethra

(b) The main excretory organ in human beings is the kidney that releases about 80% of liquid waste from the body. Urine formation occurs in the kidney in 3 parts-

1. Glomerular Filtration or Ultrafiltration

2. Selective Reabsorption

3. Tubular Secretion.

The afferent arteriole brings blood to the kidney and forms a bunch of capillaries in the Bowman’s capsule. Glomerular filtration occurs in the Bowman's capsule where glucose, salts, amino acids, urea enters the filtrate. Water and solutes that are smaller than proteins are forced into the renal tubule where reabsorption of water, glucose, amino acids and needed ions occurs and returns them back to the blood. Tubular secretion removes additional wastes from the blood and adds them to the filtrate. Further, water is removed from urine and returned to blood. Urine is sent to the collecting ducts.

Rate this question :

How useful is this solution?
We strive to provide quality solutions. Please rate us to serve you better.
Related Videos
Heights and Distances-IHeights and Distances-IHeights and Distances-I45 mins
Try our Mini CourseMaster Important Topics in 7 DaysLearn from IITians, NITians, Doctors & Academic Experts
Dedicated counsellor for each student
24X7 Doubt Resolution
Daily Report Card
Detailed Performance Evaluation
view all courses

There is a pair oLakhmir Singh & Manjit Kaur- Biology

The organs A of aLakhmir Singh & Manjit Kaur- Biology