Biology MCQs

Notes:
There are around 20,000 different species of bees in the world but only 7 of them are honeybees. Of them only five of them have commercial importance in India, they are as follows:
1. The rock bee
2. The Indian hive bee
3. The little bee
4. The European bee
5. Dammer bee

Notes:
Louis Pasteur was a French biologist, microbiologist, and chemist renowned for his discoveries of the principles of vaccination, microbial fermentation and pasteurization. He is remembered for his remarkable breakthroughs in the causes and prevention of diseases, and his discoveries have saved many lives ever since. He reduced mortality from puerperal fever and created the first vaccines for rabies and anthrax. His medical discoveries provided direct support for the germ theory of disease and its application in clinical medicine. He is best known to the general public for his invention of the technique of treating milk and wine to stop bacterial contamination, a process now called pasteurization. He is regarded as one of the three main founders of bacteriology, together with Ferdinand Cohn and Robert Koch, and is popularly known as the “father of microbiology”.

Notes:
The classical cell theory was proposed by Theodor Schwann in 1839. There are three parts to this theory. The first part states that all organisms are made up of cells. The second part states that cells are the basic units of life. The third part, which claims that cells come from pre-existing cells that have multiplied, was described by Rudolf Virchow in 1858.

Notes:
Those organisms which can live on both land and water are called amphibians. Some examples of amphibians are frogs and toads, newts, salamanders and caecilians.

Notes:
Red tides are caused by Gonyaulax which are small, microscopic organisms that grow in water and also called dinoflagellates.

Notes:
Chitin is a large, structural polysaccharide made from chains of modified glucose. Chitin is found in the exoskeletons of insects, the cell walls of fungi, and certain hard structures in invertebrates and fish. In terms of abundance, chitin is second to only cellulose.

Notes:
Cholesterol is a type of Lipid or the fat present in blood. The majority of the cholesterol consumed by the human body on a daily basis is synthesised by Liver.

Notes:
Bryophyta plant group requires both land and water to complete its life cycle. Bryophytes are an informal division consisting of 3 groups of non-vascular plants, namely mosses, liverworts and hornworts.

Notes:
The term Bryophyta was coined by Robert Brown in 1864. He included algae, fungi, lichens, and mosses under it.

Notes:
These are formed from the mother cells inside the anther. Thus, the tetrad of the megaspore is usually linear.