1. Which is a special excretory cell found in Platyhelminthes which acts like a kidney, and the flame cell does the work of removing waste material through filtration?

The small intestine is the part of the digestive system that receives secretions from the liver and pancreas.

1. Nyctalopia (night blindness) is caused by deficiency of Vitamin A.

2. Foods rich in Vitamin A are carrots, spinach, sweet potatoes, lettuce, etc.

3. Vitamin A deficiency can cause damage to rod cells, which reduces the ability to see in low light.

1. The human shoulder joint is an example of a ball and socket joint.

2. In this type of joint, a rounded end of one bone fits into a flat or cup-shaped recess of the other bone.

1. The smallest bone in the human body is the stapes.

2. This bone is located in the middle ear.

3. The length of the stapes is about 3 millimeters.

1. Rickets occurs when a child's growing bones do not develop due to vitamin D deficiency.

2. Vitamin D is an essential nutrient that helps in the absorption of calcium and phosphate.

3. Symptoms of rickets include.

- Pain and tenderness in the bones of the feet and hands

- curvature in the bones of the legs

- pain in shoulders and hips

- muscle weakness