Question

Write short notes on the following :

a) Book lungs of Arachnida

b) Pectines of scorpions​

Answer 1

Answer:

1. The book lungs is present in the scorpion which acts as an essential respiratory organ.

The book long is in close proximity with to the digestive system in case of the scorpion.

There is exchange of gases through the lymphatics and the the blood vessels which are present in the book lung.

2. The pectines of the scorpion are essential feature that helps in the the digestion and absorption of the food. They have high surface area to facilitate in the digestion of food.