Practice MCQ Questions and answers on Biology-GK

In 1939 the Swiss chemist Paul Müller discovered the insecticidal properties of DDT.

There is no bacteria activity in the ripening of cheese.

Amoeba reproduces by binary fission.

The nucleoid (meaning nucleus-like) is an irregularly-shaped region within the cell of a prokaryote that contains all or most of the genetic material. In contrast to the nucleus of a eukaryotic cell, it is not surrounded by a nuclear membrane.

In autotrophic bacteria, chlorophyll is located in the infolded plasma membrane.

Two men are credited today with the discovery of microorganisms using primitive microscopes: Robert Hooke who described the fruiting structures of molds in 1665 and Antoni van Leeuwenhoek who is credited with the discovery of bacteria in 1676.

Among the many substances manufactured commercially by means of bacteria are acetic acid, acetone, butanol, lactic acid and several vitamins.

Fungi reproduce asexually by fragmentation, budding, or producing spores.

Amoeba belongs to the phylum protozoa.

There are various methods of preserving the food items. These methods include Pasterurisation (high temperature), Fridge (low temperature), dehydration (drying), etc. Fruit, meat and milk can be preserved at room temperature by the process of dehydration. This is the most easiest and oldest method of preservation. In this, the water or moisture is removed from the food. This inhibits the growth of microorganisms and increases the shelf life of food. Vernalisation is a process of induction of flowering process in plants by exposure to the prolonged cold temperature.