General Science Questions (MCQs) for Competitive Examinations

Notes:
Ostriches found in Africa, Central and Southern Africa are the largest living species of bird. Ostriches are non-flying usually weigh 200 to 285 pounds, although some male ostriches have been recorded with weights of up to 340 pounds. They are also known to lay the largest of the egg cell.

Notes:
Tears are a clear liquid secreted by the lacrimal glands (tear ducts) in the eyes of all land mammals. The lacrimal glands are situated in the upper lateral region of each orbit, in the lacrimal fossa of the orbit formed by the frontal bone. They are paired, almond-shaped exocrine glands, one for each eye.

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:
The digestion of proteins, take place by enzymes called proteases, which begins in the stomach, where pepsin breaks down some proteins into polypeptides. The end products of protein digestion are amino acids absorbed in ileum.

Notes:
Bamboos are a group of woody perennial evergreen plants in the true grass family Poaceae. Some of its members are giants, forming by far the largest members of the grass family. There are 91 genera and about 1,000 species of bamboo.

Notes:
A pulmonary artery is an artery in the pulmonary circulation that carries deoxygenated blood from the right side of the heart to the lungs. The pulmonary arteries are unique in that unlike most arteries which carry oxygenated blood to other parts of the body, the pulmonary arteries carry de-oxygenated blood to the lungs. After picking up oxygen, the oxygen rich blood is returned to the heart via the pulmonary veins.

Notes:
The Passenger Pigeon or Wild Pigeon is an extinct North American bird. The species lived in enormous migratory flocks until the early 20th century, when continued hunting and habitat destruction led to its demise.

Notes:
The guard cells in dicot plants are kidney shaped and dumbbell shaped in monocots. When guard cells expand on the outer edges of the stoma, but not on the inner side, they result in kidney-shaped cells, leading to an opening or pore between the two guard cells for gas exchange.

Notes:
The scientific name of peacock is Pavo Cristatus. It is also known as the Indian blue peafowl, common peafowl, blue peafowl, and blue Indian peafowl. It is a large and brightly coloured bird, is a species of peafowl native to the Indian subcontinent, but introduced in many other parts of the world.

Notes:
All verteberates have notochord, body cavity and gills in their embryonic stage or adult stage but not have haemocoel. It’s presence is well marked in the members of phylum in Arthopoda.