Biology MCQs

Notes:
The wings are modified forelimbs of birds which are the key to bird flight. Each wing is composed of three limb bones, the humerus, ulna and radius. Wings are much bigger than our arms, but being made mostly of feathers and hollow bones makes them very light. Their shape uses the wind to make flying easier.

Notes:
Greek philosopher Aristotle is regarded as the Father of Biology. According to him, grouping of organisms had to be done on the basis of a number of characteristics and not just one. He is considered to be the first person to come up with a classification that still stands. His text ‘History of Animals’ is a landmark in the history of biology.

Notes:
Proteins from animals are called ‘first class’ proteins – they provide all the essential amino acids, including those that the body can’t make. Proteins from plants are ‘second class’ proteins.

Notes:
Biomass most often refers to plants or plant-based materials that are not used for food or feed, but as energy source. Biomass fuels come from things that once lived: wood products, dried vegetation, crop residues, aquatic plants and even garbage. It is known as ‘Natural Material’. As an energy source, biomass can either be used directly via combustion to produce heat, or indirectly after converting it to various forms of biofuel.

Notes:
2, 4-Dichlorophenoxyacetic acid is a s a wide range selective weedicide which controls broad leaf type (DICOT) weeds in paddy fields, tea plantations, sugarcane fields, fruit orchards etc. It is one of the most widely used herbicides in the world.

Notes:
The word ‘comose’ means ‘hairy’ in Latin. It refers to certain seeds (such as cotton) having a tuft or tufts of hair. The seeds of plants like Calotropis, Gossypium, etc, possess a large number of hair which enable them to float in air. Such seeds with hair are described as comose.

Notes:
A tadpole resembles a fish and breathes through external gills. Adult frogs breathe through their lungs and exchange gases through their moist skin and the lining of their mouths. A tadpole has a tail and is herbivorous but an adult frog lacks tail and is in sectivorous.

Notes:
Based on the mechanism of biochemical reaction, a large variety of enzymes is commonly categorized into six basic groups: oxyereductases, transferases, hydrolases, lysases, isomerases and ligases.

Notes:
R.H. Whittaker (1969) proposed a Five Kingdom Classification: Monera, Protista, Fungi, Plantae and Animalia. The main criteria for classification used by him include cell structure, thallus organisation, mode of nutrition, reproduction and phylogenetic relationships.

Notes:
Cockroaches develop through a process called gradual metamorphosis. This process has three stages: egg, nymph, and adult. All the changes during metamorphosis are regulated by the hormones thyroxine.