731. No pain is felt while cutting the nails because-

1. Nails are made of the material of dead cells in which there is no blood circulation
2. Nails are a useless part of the body
3. Nails are made of calcium phosphate
4. None of these

Option “1” is correct
Nails are usually made up of thick and multiple layers of a type of protein known as ∝ – keratin and are composed of dead tissues. They are devoid of any nerves and blood vessels and therefore we do not feel any pain while the nails are being cut.
732. When does heart rest?

1. Never
2. While sleeping
3. Between two beats
4. While doing yoga

Option “3” is correct
Each ‘heartbeat’ consist of a contraction and relaxing of the heart muscles. When the heart contracts, it pumps blood through the blood vessels. When it relaxes, it draws blood in. It takes rest between relaxation and contraction.
733. Lexicography is related to:

1. Structure of human body
2. Compilation of dictionary
3. Secret of handwriting
4. Teaching of pictures and models.

Option “2” is correct
Lexicography is related to a glossary of language design, compilation, the evaluation of general dictionaries.
734. On which of the following plant did Gregor Mendal perform his classical experiment?

1. Pea
2. Gram
3. Maize
4. Wheat

Option “1” is correct
The genetic experiment Mendal did with pea plant and published his result in 1865.
735. Dinosaurs were in-

1. Paleozoic era
2. Cenozoic era
3. Mesozoic era
4. Pleistocene era

Option “3” is correct
Dinosaurs lived between 230 and 65 million year ago, in a time known as Mesozoic Era.
736. The red colour of the red sea is due to the presence of :

1. Moss
2. Bacteria
3. Algae
4. Fungi

Option “3” is correct
The Red Sea is a seawater inlet of the Indian Ocean, lying between Africa and Asia. An alga, of phylum Cyanobacteria called Trichodesmium erythraeum is present in this sea. It contains abundant quantities of pigments, phycobilin, phycoerythrin and phycocyanin, due to which the sea appears red or pinkish.
737. Plants adapted to dry climate are known as-

1. Epiphyte
2. Xerophyte
3. Hydrophytes
4. Mean plants

Option “2” is correct
A xerophyte is a species of plant that has adapted to survive in a dry environment.
738. The scientific study of insects is known as:

1. Ichthyology
2. Entomology
3. Parasitology
4. Malacology

Option “2” is correct
Ichthyology – Study of fish.
Entomology – Scientific study of insects.
Parasitology – Study of parasitic organisms.
Malacology – Study of molluscs.
739.  What is hydroponics?

1. Plant without soil enrichment
2. Grafting plant
3. Study of vegetables
4. Soil conservation

Option “1” is correct
Hydroponics is a subset of hydroculture and is a method of growing plant using mineral nutrients solutions in water without soil.
740. Dolphins are classified in-

1. Fish
2. Amphibians
3. Reptile
4. Mammals

Option “4” is correct
Dolphins are highly intelligent marine mammals and are part of the family of toothed whales. India has declared Ganga Dolphin as the national aquatic animal of India.
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48 thoughts on “Biology”

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