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1660+ Biology (GK) Solved MCQs

These multiple-choice questions (MCQs) are designed to enhance your knowledge and understanding in the following areas: General Knowledge (GK) .

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901.

Mercury poisoning in man causes the disease –

A. Black lung
B. Arsenicosis
C. Minamata
D. Tai-Etai
Answer» C. Minamata
Explanation: Minamata disease is a neurological syndrome caused by severe mercury poisoning. It was first discovered in Minamata city in Kumamoto prefecture, Japan, in 1956
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902.

Chromosomes consist of –

A. DNA and lipids
B. RNA and amino acids
C. DNA and proteins
D. RNA and sugar
Answer» C. DNA and proteins
Explanation: A chromosome is an organized structure of DNA and protein found in cells. It is a single piece of coiled DNA containing many genes, regulatory elements and other nucleotide sequences. Chromosomes also contain DNA- bound proteins, which serve to package the DNA and control its functions.
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903.

Which one of the following organs converts glycogen into glucose and purifies the blood?

A. Liver
B. Kidney
C. Lungs
D. Spleen
Answer» A. Liver
Explanation: Liver produces bile which is stored in the gall bladder. Liver is the largest gland in the body.
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904.

Absence of fish along a river indicates

A. Zone of degradation
B. Zone of active decomposition
C. All zones of pollution
D. Zone of recovery
Answer» A. Zone of degradation
Explanation: Absence of fish along a river indicates zone of degradation.
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905.

Which of the following is not an endocrine gland?

A. Pituitary
B. Thyroid
C. Adrenal
D. Spleen
Answer» D. Spleen
Explanation: 0
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906.

Which of the following is an insectivorous plant?

A. Balanophora
B. Rafflesia
C. Orobanche
D. Drosera
Answer» D. Drosera
Explanation: An insectivorous plant, also called a carnivorous plant, captures prey items, such as insects, spiders, Crustaceans, mites, and protozoans, as a nitrogen source. Aldrovanda, Dionaea, Drosera, Drosophyllum, etc are some of them under the Droseraceae family.
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907.

Seed dormancy is regulatedby –

A. Abscisic acid
B. Gibberellic acid
C. Indole acetic acid
D. Ethylene
Answer» A. Abscisic acid
Explanation: The transition from dormancy to germination in seeds is a key physiological process during the lifecycle of plants. Abscisic acid (ABA) is the sole plant hormone known to maintain seed dormancy. It acts through a gene expression network involving the transcription factor ABSCISIC ACID INSENSITIVE 3 (ABI3).
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908.

The process through which excess of light energy is dissipated in photosynthesis is known as

A. Quenching
B. Scavenging
C. Photolysis
D. Photophosphatylation
Answer» A. Quenching
Explanation: Quenching is a process in which absorbed light energy is dissipated as heat and does not take part in photochemistry. The phenomenon involves quenching of chlorophyll a (Chia) fluorescence, which is induced under steady-state illumination.
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909.

AIDS virus destroys –

A. Lymphocytes
B. Monocytes
C. Neutrophils
D. Basophils
Answer» A. Lymphocytes
Explanation: AIDS virus destroys the T-cells inside of the immune system. T cells or T lymphocytes belong to a group of white blood cells known as lymphocytes, and play a central role in cell-mediated immunity.
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910.

Which bacterial strain developed from natural isolates by genetic manipulations can be used for treating oil spills?

A. Pseudomonas
B. Agrobacterium
C. Clostridium
D. Nitrosomonas
Answer» D. Nitrosomonas
Explanation: Nitrosomonas is a genus comprising rod shaped chemoautotrophic bacteria. This rare bacteria oxidizes ammonia into nitrite as a metabolic process. Nitrosomonas are useful in treatment of industrial and sewage waste and in the process of bioremediation.
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911.

Thiamidine dimer formation in DNA is caused by -

A. IR-rays
B. X-rays
C. b and g-rays
D. UV-rays
Answer» D. UV-rays
Explanation: When cells are exposed to sunlight, radiant energy damage the DNA. For example, ultraviolet irradiation causes covalent bond formation between adjacent thymines on the same strand of DNA. Ultraviolet light is absorbed by a double bond in thymine and cytosine bases in DNA. This added energy opens up the bond and allows it to react with a neighboring base.
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912.

One of the following excretes uric acid as its excretory product –

A. Amoeba
B. Tilapia
C. Sparrow
D. Camel
Answer» C. Sparrow
Explanation: Sparrow excretes uric acid as its excretory product.
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913.

Smut of wheat is mused by –

A. Ustilago maydis
B. Puccinia graminis
C. Ustilago tritici
D. Colletotrichum falcatum
Answer» C. Ustilago tritici
Explanation: Smut of wheat is caused by Ustilago tritici.
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914.

Which of the following is an endangered species?

A. Black buck
B. Blue sheep
C. Gangetic dolphin
D. Mithun
Answer» B. Blue sheep
Explanation: According to the Red list of 2012, Ganges River Dolphin is one of critically endangered species in India. Endangered species in India comprise large varieties of rare species of wild animals, aquatic animals and insects.
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915.

Of the following man-made disasters, which is socially induced?

A. Debris Avalanche
B. Salt Water Intrusion
C. Arson
D. Ozone depletion
Answer» C. Arson
Explanation: Arson is the crime of intentionally and maliciously setting lire to buildings, wild land areas, vehicles or other property with the intent to cause damage. Distinct from spontaneous combustion and natural wildfires, itis considered to be a man-made disaster which is socially induced.
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916.

Which one of the following endocrine gland is situated in the neck?

A. Pancreas
B. Thyroid
C. Pituitary
D. Adrenals
Answer» B. Thyroid
Explanation: The thyroid gland is one of the largest endocrine glands in the human body which is found in the neck. It controls how quickly the body uses energy, makes proteins, and controls how sensitive the body is to other hormones.
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917.

The seat of intelligence is situated in the

A. cerebrum
B. cerebellum
C. medulla
D. thalamus
Answer» B. cerebellum
Explanation: The cerebrum is the seat of intelligence and provides us with the ability to read, write and speak; make calculations and compose music; remember the past and plan for the future; and create works.
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918.

For which one among the following diseases no vaccine is yet available?

A. Tetanus
B. Malaria
C. Measles
D. Mumps
Answer» B. Malaria
Explanation: Malaria vaccine is a vaccine that is used to prevent malaria. The only approved vaccine as of 2015 is RTS,S, known by the trade name Mosquirix. It requires four injections, and has a relatively low efficacy.
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919.

Octopus is -

A. an arthropod
B. an echinoderm
C. a hemichordate
D. a mollusc
Answer» D. a mollusc
Explanation: Octopus is an animal of class- Cephalopoda and phylum Mollusca. The shell is absent. It is found at bottom of the sea. It kills its prey with poisonous saliva. It can change its colour.
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920.

Potential of air pollution increases when the ventilation coefficient is –

A. > 119000 m2/s
B. > 7,600 m2/s
C. < 3.600 m2/s
D. < 6,000 m2/s
Answer» D. < 6,000 m2/s
Explanation: The product of the maximum mixing depth and the average wind speed within the mixing depth is sometimes used as an indicator of the atmosphere's dispersive capability. This product is known as the ventilation coefficient (m2/s). Values of ventilation coefficient less than about 6000 m2is are considered indicative of high air pollution potential (Portelli and Lewis, 1987).
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921.

Who among the following have venous heart?

A. Mammals
B. Reptilians
C. Fishes
D. Amphibians
Answer» C. Fishes
Explanation: There are over 20,000 species of fish, divided into three groups : bony fish, cartilaginous fish and jawiess fish. Bony fish, which are the most numerous, have skeletons, of bone, and swimbladders (gas-filled organs) to keep them afloat. Cartilaginous fish, such as sharks, rays and raffish, are mostly marine hunters; they have skeletons made of cartilage and sandpaper-like skin. The primitive jawless fish have sucker-like mouths, and include lampreys and hagfish.
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922.

In our body, antibodies are formed against pathogens in –

A. liver by RBC
B. blood by platelets
C. brain by macrophages
D. thymus by lymphocytes
Answer» D. thymus by lymphocytes
Explanation: 0
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923.

Prawn heart carries -

A. no blood
B. deoxygenated blood
C. oxygenated blood
D. mixed blood
Answer» C. oxygenated blood
Explanation: 0
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924.

Minamata disease was caused due to –

A. Lead
B. Cyanide
C. Mercury
D. Methyl isocyanate
Answer» C. Mercury
Explanation: Mimamata disease in Japan was caused due to mercury.
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925.

Nutrients are recycled in the atmosphere with the help of certain micro- organisms referred to as -

A. producers
B. consumers
C. decomposers
D. None of these
Answer» C. decomposers
Explanation: Decomposers recycle nutrients in the atmosphere.
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926.

The yellow colour of urine is due to presence of –

A. Bile
B. Lymph
C. Cholesterol
D. Urochrorne
Answer» D. Urochrorne
Explanation: The color of normal urine is usually light yellow to amber. Generally, the greater the solute volume the deeper the color. The yellow color of urine is due to the presence of a yellow pigment, urochrome. Deviations from normal color can be caused by certain drugs and various vegetables such as carrots, beets, and rhubarb.
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927.

Which of the following is known as 'grave yard' of RBCs?

A. Liver
B. Bone marrow
C. Spleen
D. Appendix
Answer» C. Spleen
Explanation: The old, worn out and dead RBC are destroyed mainly in an organ called spleen. Hence, it is commonly called the 'graveyard of RBC'.
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928.

Silk is produced by –

A. Egg of a silkworm
B. Pupa of silkworm
C. Larva of silkworm
D. Insect itself
Answer» C. Larva of silkworm
Explanation: Silk is a natural protein fibre, some forms of which can be woven into textiles. The protein fibre of silk is composed mainly of fibroin and produced by certain insect larvae to form cocoons. The best-known type of silk is obtained from the cocoons of the larvae of the mulberry silkworm Bombyx mori.
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929.

Which of the following is an egg laying mammal?

A. Bat
B. Leafy anteater
C. Whale
D. Spiny anteater
Answer» D. Spiny anteater
Explanation: Monotremes are mammals that lay eggs instead of giving birth to live young like marsupials and placental mammals. The only surviving examples of monotremes are all indigenous to Australia and New Guinea, although there is evidence that they were once more widespread. Among living mammals they include the platypus and four species of echidnas (or spiny anteaters).
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930.

The tallest plant in the world is –

A. Eucalyptus
B. Pterocarpus
C. Polyalthia
D. Tectona
Answer» A. Eucalyptus
Explanation: Eucalyptus regnans is the tallest of all flowering plants, and possibly the tallest of all plants, although no living specimens can make that claim. The tallest measured living specimen, named Centurion, stands 101 metres tall in Tasmania.
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931.

The only bird that flies backward is –

A. Sparrow
B. Koel
C. Siberian Crane
D. Humming birds
Answer» D. Humming birds
Explanation: A humming bird can rotate each of its wings in a circle, allowing them to be the only bird which can fly forwards, backwards, up, down, sideways or sit in sheer space. To hover, hummingbirds move their wings forward and backward in a repeated figure eight, much like the arms of a swimmer treading water. Humming birds can move instantaneously in any direction, start from its perch at full speed, and doesn't necessarily slow up to land.
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932.

Which of the following pairs has open type of circulatory system?

A. Earthworm and Leech
B. Man and Whale
C. Cockroach and Silverfish
D. Tadpole larva and Fish
Answer» C. Cockroach and Silverfish
Explanation: The open circulatory system is common to mollusks and arthropods. Open circulatory systems pump blood into a hemocoel with the blood diffusing back to the circulatory system between cells. Blood is pumped by a heart into the body cavities, where tissues are surrounded by the blood. Cockroaches and silverfish have an open circulatory system. They don't have any blood vessels.
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933.

Which of the following animals does not have nervous system?

A. Leech
B. Tapeworm
C. Amoeba
D. Snail
Answer» C. Amoeba
Explanation: The amoebas do not have nervous system, but they communicate by means of the interaction of the cellular membrane with the outside that surrounds to him. Like answer for example to an injurious stimulus, irritating or nutritional, the intracellular communication produces a reaction of the complete cell, moving away or approaching the respective stimulus.
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934.

Plants differ from animals in having –

A. locomotion
B. metabolism
C. localised growth
D. catabolism
Answer» C. localised growth
Explanation: Plants produce new cells and grow only in their shoot and root apical meristems and leaf primordia; this is localized growth. In contrast, all parts of an animal's body grow (diffuse growth). From the time we are ernbroys until we are about 18 years old, all parts of our body grow simultaneously. Due to a plant's localized growth, an individual plant can have older, completely mature and highlyfunctional leaves at the same time that it is still producing new leaves.
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935.

Root nodules are commonly found in –

A. Parasitic plants
B. Epiphytic plants
C. Leguminous plants
D. Aquatic plants
Answer» C. Leguminous plants
Explanation: 0
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936.

A disease caused by Protozoa is –

A. Common cold
B. Pneumonia
C. Malaria
D. Cholera
Answer» C. Malaria
Explanation: Malaria is caused by protozoan of the genus Plasmodium. There are several stages in the life cycle of Plasmodium, including sporozoites, merozoites, and gametocytes. Sporozoites are the form that is injected by the mosquito into humans.
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937.

Which of the following is a Vitamin?

A. Keratin
B. Riboflavin
C. Insulin
D. Adrenalin
Answer» B. Riboflavin
Explanation: Riboflavin, also known as vitamin B2 is an easily absorbed colored micronutrient with a key role in maintaining health in humans and animals. It plays a key role in energy metabolism, and for the metabolism of fats, ketone bodies, carbohydrates, and proteins. Milk, cheese, leaf vegetables, liver, kidneys, legumes, yeast, mushrooms, and almonds are good sources of vitamin B2, but exposure to light destroys riboflavin.
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938.

Which of the following organisms does not fit into the Cell Theory?

A. Bacteria
B. Virus
C. Fungi
D. Plants
Answer» B. Virus
Explanation: The cell theory states that all living things are made of cells, cells are the basic units of structure and function of living things, and that all cells come from other cells.
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939.

The most abundant enzyme in the living world is -

A. Rubisco
B. invertase
C. DNAse
D. zymase
Answer» A. Rubisco
Explanation: Rubisco or ribulose 1, 5 bisphosphate carboxylase oxygenase is the plants enzyme which helps in the dark phase of photosynthesis (in the synthesis of ribulose sugar).
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940.

Scurvy is a disease of –

A. hair
B. skin
C. liver
D. eyes
Answer» B. skin
Explanation: Scurvy is caused by the deficiency of Vitamin. C, Vitamin. This causes muscle weakness, joint pain and problems with wound healing. It can also lead to loose teeth, bleeding and swollen gums, easily bruised skin and fatigue, and sometimes depression
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941.

The population of which of the following is maximum on the earth?

A. Fishes
B. Beetles
C. Reptiles
D. Birds
Answer» C. Reptiles
Explanation: Fish as a community comprise the largest group on the earth as 72 percent of the worlds surface is covered with water. Fish are found from equatorial to polar climates; in salty or freshwater sources. It is assumed that life on the Earth began from fish.
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942.

The term ’Rh factor’ refers to -

A. Rhesus factor
B. Rheumatoid factor
C. Renal factor
D. Rhombic factor
Answer» A. Rhesus factor
Explanation: The Rhesus factor (Rh factor) is an alternate form in each blood group. The factor first discovered by Carl Landsteiner in Rhesus monkey, present in the forest of South Africa.
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943.

Who proposed the adage "Survival of the fittest"?

A. Darwin
B. William
C. Huxley
D. Lamarck
Answer» A. Darwin
Explanation: Charlse Darwin (1809-1882) was British naturalist scientist. After studying animal life in South Seas, he wrote The Origin of
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944.

The largest invertebrate is a/an –

A. Sponge
B. Mollusc
C. Arthropod
D. Echinoderm
Answer» B. Mollusc
Explanation: The largest invertebrate is Mollusc. With over 80,000 species, molluscs form the second largest phylum of animals on Earth and range from tiny snails to giant squid.
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945.

The basic structural and functional unit of living organisms is -

A. Cell
B. Tissue
C. Organ
D. Systems
Answer» A. Cell
Explanation: Robert Hooke (1665) observed a section of cork under his microscope and found its structure resembling a 'honey comb'. He gave the name 'cell' to each of the compartments of the honey comb like structure. Two German biologists, M Schleiden and T Schwann, proposed the famous cell theory in 1938-39.
discuss
946.

The acid stored in batteries is –

A. Sulphuric acid
B. Nitric acid
C. Hydrochloric acid
D. Acetic acid
Answer» A. Sulphuric acid
Explanation: Battery acid is sulfuric acid that has been diluted with water to attain a 37% concentration level. This particular type of acid is used in sealed lead acid batteries, however, concentration levels differentiate with some brands. These batteries use a combination of lead plates and an electrolyte consisting of a diluted sulphuric acid to convert electricalenergy into potential chemical energy and back again.
discuss
947.

'Stone Cancer' occurs due to –

A. Acid rain
B. Global warming
C. Radioactivity
D. Bacterial action
Answer» A. Acid rain
Explanation: Acid rain is caused due to oxides of sulphur and nitrogen mixing with rain water making rain water acidic. When calcium carbonate of white marble reacts with acidic water, it results into its corrosion. This is known as stone cancer. Our heritage monuments, like the Taj Mahal, are threatened by stone cancer.
discuss
948.

Which of the following is a protein?

A. Wool
B. Starch
C. Natural rubber
D. Cellulose
Answer» C. Natural rubber
Explanation: Natural Rubber is an elastic substance obtained from the latex sap of trees, especially those trees which belong to the genera Hevea and Ficus.
discuss
949.

Scientists has genetically modified photosynthesis process to increase crop yield by -

A. 11 Percent
B. 12 Percent
C. 15 Percent
D. 17 Percent
Answer» C. 15 Percent
Explanation: Photosynthesis, they convert water and carbon dioxide (CO2) to sugar and oxygen with the help of sunlight.
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950.

When the Left Ventricle in the human heart contracts, the blood moves to the -

A. Brain
B. Pulmonary Artery
C. Aorta
D. Lungs
Answer» C. Aorta
Explanation: As the left ventricle contracts, the oxygenated blood is pumped into the main artery of the body — the aorta. To get to the aorta, blood passes through the aortic semilunar valve, which serves to keep blood flowing from the aorta back into the left ventricle.
discuss

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