Time limit: 0
0 of 50 questions completed
- Science and Tech-Biology Important Questions
- Free Online Test with Answers
- Very useful for all Competitive Exams
You have already completed the quiz before. Hence you can not start it again.
Test is loading...
You must sign in or sign up to start the quiz.
You have to finish following quiz, to start this quiz:
0 of 50 questions answered correctly
Time has elapsed
You have reached 0 of 0 points, (0)
- Not categorized 0%
- Question 1 of 50
Which one of the following is a female sex hormone?
Estrogen is a female hormone that plays various roles. It helps develop and maintain both the reproductive system and female characteristics, such as breasts and pubic hair.
- Question 2 of 50
Which one of the following chemicals is a neurotransmitter substance?
Adrenaline is a neurotransmitter in the sense that, within the brain, it helps neurons to communicate with one another.
- Question 3 of 50
Which of the following is the function of “Iodised Salt” in the human body?
Thyroid gland uses iodine to make thyroid hormones, which help control growth, repair damaged cells and support a healthy metabolism.
- Question 4 of 50
Which of the following vegetable oils does not contain essential fatty acids?
Omega-3 and 6 fatty acids are also called essential fatty acids. Coconut oil does not contain essential fatty acids. It is a highly beneficial healthy fat but does not actually contain Omega fatty acids. Sunflower oil, Mustard oil and Groundnut oil contain essential fatty acids.
- Question 5 of 50
Pregnant women usually become deficient in:
Pregnant women usually become deficient in Calcium and Iron. During Pregnancy, the body needs iron to make hemoglobin — that’s the substance in red blood cells that helps carry oxygen to organs and tissues. A developing baby needs calcium to build strong bones and teeth.
- Question 6 of 50
Which components of light are absorbed by chlorophyll?
Chlorophyll is an extremely important biomolecule, critical in photosynthesis, which allows plants to absorb energy from light. Chlorophyll absorbs light most strongly in the blue portion of the electromagnetic spectrum, followed by the red portion.
- Question 7 of 50
Ginger is a stem and not a root because:
The rhizomes of ginger are considered as stems and not as roots as it contains nodes and internodes.
- Question 8 of 50
Eyes of potato are useful for:
The ‘eye’ of the potato can produce new plants by vegetative propagation.
- Question 9 of 50
Taenia solium (Tapeworm) lives as a parasite in:
Pigs are intermediate hosts of the Taenia solium (Tapeworm). Taenia solium infection (taeniasis) is an intestinal infection with adult tapeworms that follows ingestion of contaminated pork.
- Question 10 of 50
An ant can see the objects all around it due to the presence of:
The visual system of an ant is comprised of a pair of compound eyes and a set of simple eyes called ocelli.
- Question 11 of 50
What is the approximate time required for a heartbeat?
The approximate time required for a heartbeat is 0.8 second. A normal resting heart rate for adults ranges from 60 to 100 (for children- 70 to 100) beats per minute. (Approximate time required for a heartbeat = 60 second ÷ average heart rate ≈ 0.8 second).
- Question 12 of 50
Which of the following is not a gland?
A gland is an organ that makes one or more substances, such as hormones, digestive juices, sweat, tears, saliva, or milk. Stomach is not a gland but a muscular, hollow organ.
- Question 13 of 50
Which one of the following is an abnormal constituent of urine?
Ketone bodies are chemicals that the body makes when there is not enough insulin in the blood and it must break down fat instead of the sugar glucose for energy. Testing for ketones in urine is important in people with diabetes.
- Question 14 of 50
Which one of the following cells produces antibodies?
A lymphocyte is a type of white blood cell that is part of the immune system. Lymphocytes include natural killer cells, T cells, and B cells. The job of B cells is to make antibodies, which are proteins produced by the immune system to fight foreign substances known as antigens.
- Question 15 of 50
The Vitamin which helps in clotting of blood is:
Vitamin K helps to make various proteins that are needed for blood clotting and the building of bones.
- Question 16 of 50
At very high altitude, the Red Blood Corpuscles in the human body will:
Number of red blood cells per unit volume of blood is likely to be higher in a person living at high altitudes. This is in response to the air being less dense at high altitudes and the number of red blood cells is needed to trap O2 from rarefied air having low pO2 (partial pressure of oxygen).
- Question 17 of 50
A test-tube baby means:
A test-tube baby means fertilisation in vitro and then transplantation in the uterus. It involves fertilizing an egg outside the body, in a laboratory dish (vitro), and then implanting it in a woman’s uterus.
- Question 18 of 50
A substance that stimulates the production of antibodies when introduced into a living organism is known as:
Antigen stimulates the production of antibodies when introduced into a living organism. It is a substance that enters the body and starts a process that can cause disease. The body then usually produces substances (antibodies) to fight the antigens.
- Question 19 of 50
‘Darwin finches’ refer to a group of:
Darwin’s finches are a group of about 18 species of passerine birds. Darwin’s finches are the classic example of adaptive radiation, the evolution of groups of plants or animals into different species adapted to specific ecological niches.
- Question 20 of 50
The tissue in man where no cell division occurs after birth is:
In nerve tissue, no cell division occurs after birth. Most somatic cells divide regularly, while there are a few cells in the body that do not undergo cell division (such as gametes, red blood cells, most neurons, and some muscle cells).
- Question 21 of 50
The source of oxygen generated during photosynthesis is:
The oxygen released during photosynthesis is from the water. The plants absorb water as well as carbon dioxide during photosynthesis. Later these water molecules are converted into oxygen and sugar. The oxygen is then released into the atmosphere whereas the sugar molecules are stored for energy.
- Question 22 of 50
Which one of the following elements is associated with teeth disorder?
Fluoride or fluorine deficiency can lead to tooth decay and possibly osteoporosis. Consuming enough fluoride can make tooth decay less likely and may strengthen bones. Fluoride is a mineral stored in teeth and bones that strengthens them by aiding in the retention of calcium.
- Question 23 of 50
Hay fever is a sign of:
Hay fever, also called seasonal allergies, causes cold-like signs and symptoms, such as a runny nose, itchy eyes, congestion, sneezing and sinus pressure. But unlike a cold, hay fever isn’t caused by a virus.
- Question 24 of 50
Edward Jenner is associated with:
Edward Jenner (1749 – 1823) was an English surgeon, who discovered a vaccination for smallpox. It is in fact, the world’s first vaccine.
- Question 25 of 50
A plant with compound leaves is:
A compound leaf consists of several or many distinct parts (leaflets) joined to a single stem. Coconut, Shame plant, Rose, Clover, Baobab, Neem, Buckeye, Desert cotton, Horse chestnut, Poison ivy, etc. are some examples of a compound leaf. Papaya, Guava, peepal, hibiscus, oregano, pear plant, etc are simple leaves.
- Question 26 of 50
The scientist who explained about blood circulation for the first time was:
William Harvey made the momentous medical discovery that the flow of blood must be continuous and that its flow must be in one direction only.
- Question 27 of 50
Which one of the following is not a digestive enzyme?
Digestive enzymes are a group of enzymes that break down polymeric macromolecules into their smaller building blocks, in order to facilitate their absorption by the body. Insulin is not a digestive enzyme but a hormone made in the pancreas, a gland located behind the stomach. It allows the body to use glucose for energy.
- Question 28 of 50
The ‘Theory of Evolution’ was put forward by:
Charles Robert Darwin was an English naturalist, geologist and biologist, best known for his contributions to the Theory of Evolution.
- Question 29 of 50
In a human body, the longest bone is in the:
The femur is the longest bone found in the human body. It is almost 19.9 inches long and is commonly known as the thigh bone.
- Question 30 of 50
The metal present in insulin is:
Zinc is the metal which presents in insulin. Insulin is a hormone that regulates the level of sugar (glucose) in the blood and that is produced by the beta cells of the islets of Langerhans in the pancreas. In humans, insulin is stored as a crystalline hexamer containing two zinc ions and one calcium ion. The chemical formula of insulin is C257H383N65O77S6.
- Question 31 of 50
Which of the following is an ozone-depleting pesticide?
Methyl bromide (CH3Br) damages the ozone layer once released into the atmosphere. It is also toxic and harmful to humans and fauna if not used carefully. Methyl bromide is an odorless, colorless gas used to control a wide variety of pests in agriculture, including fungi, weeds, insects, nematodes (or roundworms), and rodents.
- Question 32 of 50
Roundworm is a human parasite found in the:
A Roundworm (called Ascaris lumbricoides) is a human parasite found in the Small intestine. It infects a human’s small intestine and acts as a parasite, getting nutrients from its host’s intestinal tract.
- Question 33 of 50
Who introduced the use of artificial heart for surgery?
Christiaan Neethling Barnard introduced the use of artificial heart for surgery. He was a South African cardiac surgeon who performed the world’s first human-to-human heart transplant operation.
- Question 34 of 50
Which of the following is a rich source of Vitamin B12?
Vitamin B12, also known as cobalamin, is an essential vitamin necessary for healthy nerve tissue, brain function, and red blood cell production. Rich sources of vitamin B12 are meat, fish, milk, cheese, eggs, etc.
- Question 35 of 50
Clove, the commonly used spice, is obtained from the:
Cloves are the aromatic flower buds of a tree in the family Myrtaceae, Syzygium aromaticum.
- Question 36 of 50
Milk is not considered a balanced diet now-a-days because of the absence of:
Milk has some good qualities (protein, calcium, vitamin D, etc.) However, milk is a poor source of iron and vitamin C.
- Question 37 of 50
Seasickness is due to the effect of the motion of the ship, on:
Seasickness is a result of a conflict in the inner ear, where the human balance mechanism resides, and is caused by a vessel’s erratic motion on the water.
- Question 38 of 50
The main function of white blood cells in the body is to:
The main function of white blood cells (WBCs) in the body is to protect the body against disease. WBCs protect the body against infection. As WBCs travel through the bloodstream and tissues, they locate the site of an infection and act as an army general to notify other WBCs of their location to help defend the body from an attack of an unknown organism.
- Question 39 of 50
The gas used for artificial fruit ripening of green fruit is:
The gas used for artificial fruit ripening of green fruit is Acetylene. Ethylene is produced naturally by plants. It is naturally responsible for the faster ripening of the fruit because it helps in increasing the rate of respiration, change in colour, odour and taste.
- Question 40 of 50
‘ELISA test’ is employed to diagnose:
An enzyme-linked immunosorbent assay, also called ELISA or EIA, is a test that detects and measures antibodies in your blood.
- Question 41 of 50
EEG is used to detect the functioning of:
EEG (electroencephalogram) is used to detect the functioning of the Brain. It is a test that detects electrical activity in the brain using small, metal discs (electrodes) attached to the scalp.
- Question 42 of 50
Locked jaw disorder is the other name of the disease:
Locked jaw disorder is the other name of the disease Tetanus. It is a serious bacterial infection which affects the muscles and the nervous system throughout the body. This infection often affects the muscles of the neck and jaw, but eventually spreads to the rest of the body.
- Question 43 of 50
Excretory products of a mammalian embryo are eliminated out by:
Excretory products of a mammalian embryo are eliminated out by Placenta. The placenta is a temporary organ that develops in the uterus during pregnancy. It provides the nutrients and oxygen to the baby for development and growth. Excretory products eliminated from the embryo such as urea, uric acid, and creatinine are transferred to the maternal blood by diffusion across the placenta.
- Question 44 of 50
In male sharks, claspers are found attached to:
In male sharks, two claspers are found attached to the Pelvic fin. The claspers are simply a modified portion of the pelvic fin, and since there are two pelvic fins, there are two claspers.
- Question 45 of 50
What part of the eye gets inflamed and becomes pink when dust gets into it?
The conjunctiva of the eye gets inflamed and becomes pink when dust gets into it. It is the clear, thin membrane that covers part of the front surface of the eye and the inner surface of the eyelids. Conjunctivitis is often called pink eye. It happens when the conjunctiva is irritated by an infection or allergies or dust.
- Question 46 of 50
What is the number of chromosomes in a normal human body cell?
A normal human body cell typically has 23 pairs of chromosomes or 46 chromosomes in total. Chromosomes are made up of long strands of DNA, which contain all the body’s genes.
- Question 47 of 50
Xerophthalmia is a deficiency disease caused by lack of:
Xerophthalmia is a disease that causes dry eyes due to vitamin A deficiency. If it goes untreated, it can progress into night blindness or spots on the eyes. It can even damage the cornea of the eye and cause blindness.
- Question 48 of 50
Out of the following glands which is referred to as the master gland?
The pituitary gland is sometimes called the ‘master gland’ of the endocrine system because it controls the functions of many of the other endocrine glands. It is located at the base of the brain.
- Question 49 of 50
What is an antibiotic?
Antibiotics are synthetic compounds inhibiting the growth of bacteria. They are medicines that fight bacterial infections. They work by killing the bacteria or by making it hard for the bacteria to grow and multiply.
- Question 50 of 50
Carbohydrate is stored in the body as:
Carbohydrate is stored in the body as glycogen. The body breaks down most carbohydrates from the foods and converts them to a type of sugar called glucose. Glycogen is a multibranched polysaccharide of glucose that serves as a form of energy storage in animals, fungi, and bacteria.