By learning ICSE Model paper Class 7 Biology students will know that Threads obtained from plants and animals are natural fibres. Examples of plant fibres include cotton, flax, and jute, and wool and silk are examples of animal fibre. The wool comes from animals like sheep, goat, yak etc. and silk comes from warm silk. Animal fibres are made up of proteins (a complex compound that forms the bulk of all animals ' bodies). Wool is the animal fibre that is used the most. Wool is used to kneading sweaters, to knit shawls and other woven cloths. The wool comes from animal fleece (hair) such as sheep, goat, yak, and some other species. These animals bear body hair. Wool hairs which yield animals trap lots of air. Air is a poor heat conductor. So hair keeps these animals warm by winter shielding their body from cold. Because of this, these animals ' hairs are collected at the beginning of the summer season only once a year. By the time winter comes, their hairs will rise again. Wool is obtained mostly from goats. A sheep's fleece is made up of two fibre types: coarse beard fur. For more information on Fibre to Fabric, students can take online classes for ICSE Biology Sample Paper for Class 7 from the Extramarks app. ICSE Biology Sample Paper for Class 7 has one more important chapter- Water: A Precious Resource. When you take a picture of the Earth from outer space, it appears blue in the form of sea and ocean due to the presence of water. About 71 per cent of the Earth's surface is water. Of the overall water on Earth, 97.4% is in the seas and oceans, but it is not suitable for human use. In a usable form, freshwater is present in just a small fraction of all Earth's water. Most people believe there is plenty of water throughout the world. Yet in fact, all this water isn't suitable for human use, not even suitable for plants and other life forms. There are various forms of Water. For video lectures of Water: A Precious Resource students can enrol for ICSE Class 7 Biology Question Paper membership on the Extramarks app. If students want ICSE Class 7 Biology Question Paper so they can take help of the Extramarks app.
