Biology GK Questions Quiz-8

Biology GK Questions Quiz-8

Biology Multiple Choice Questions (MCQs) Quiz for State and UPSC Civil Services Examinations. Objective Questions on Biology for competitive examinations.

    141. What part of the eye gets inflamed and becomes pink when dust gets into ?

    (1) Cornea 
    (2) Choroid
    (3) Conjunctiva 
    (4) Sclerotic
    Answer:
    141. (3) Conjunctivitis is inflammation of the conjunctiva or thin membrane covering the white of the eye and the inner surface of the eyelid. The inflamed conjunctiva will usually make the eye appear red or pink because the tiny blood vessels that are normally within the conjunctiva are now irritated and enlarged. The white of the eye (sclera) is covered by a thin, filmy membrane called the conjunctiva which produces mucus to coat and lubricate the surface of the eye. It normally has fine blood vessels within it, which can be seen on close inspection. When the conjunctiva becomes irritated or inflamed, the blood vessels which supply it enlarge and become much more prominent, and the eye turns red.

    142. Clove, the commonly used spice, is obtained from the

    (1) root 
    (2) stem
    (3) flower bud 
    (4) fruit
    Answer:
    142. (3) Cloves are the aromatic dried flower buds of a tree in the family Myrtaceae, Syzygium aromaticum. Cloves are native to the Maluku islands in Indonesia and used as a spice in cuisines all over the world. The English name derives from Latin clavus ‘nail’ (also the origin of French clou and Spanish clavo, ‘nail’) as the buds vaguely resemble small irregular nails in shape.

    143. Milk is not considered a balanced diet now-a-days because of the absence of :

    (1) Magnesium and Vitamin D
    (2) Iron and Vitamin C
    (3) Calcium and Vitamin C
    (4) Iron and Vitamin A
    Answer:
    143. (2) A balanced diet means getting the right types and amounts of foods and drinks to supply nutrition and energy for maintaining body cells, tissues, and organs, and for supporting normal growth and development. Milk is not considered a balanced diet as it lacks iron and some vitamins like Vitamin C. Calcium, phosphate, magnesium, sodium, potassium, citrate, and chlorine are all included as minerals and they typically occur at concentration of 5–40 mM.

    144. Sea sickness is due to the effect of the motion of ship, on

    (1) internal ear 
    (2) heart
    (3) stomach 
    (4) eyes
    Answer:
    144. (3) Motion sickness or kinetosis, also known as travel sickness, is a condition in which a disagreement exists between visually perceived movement and the vestibular system’s sense of movement. Depending on the cause it can also be referred to as seasickness, car sickness, simulation sickness or airsickness. If the motion causing nausea is not resolved, the sufferer will usually vomit. Ginger is reported to calm the pyloric valve located at the base of the stomach. This relaxation of the valve allows the stomach to operate normally whereby the contents will enter the small intestine instead of being retained within the stomach. It is this undesirable effect of retention in the stomach that eventually results in vomiting.

    145. The main function of white blood cells in the body is to

    (1) carry oxygen
    (2) help in clot formation
    (3) produce more red cells
    (4) protect body against diseases
    Answer:
    145. (4) White blood cells, or leukocytes are cells of the immune system involved in defending the body against both infectious disease and foreign materials. They are produced and derived from a multipotent cell in the bone marrow known as a hematopoietic stem cell. They live for about three to four days in the average human body. Leukocytes are found throughout the body, including the blood and lymphatic system.

    146. ‘ELISA’ test is employed to diagnose

    (1) Polio virus
    (2) AIDS antibodies
    (3) Tuberculosis bacterium
    (4) Cancer
    Answer:
    146. (2) ELISA (Enzyme-linked immunosorbent assay) test is usually the first one used to detect infection with HIV. If antibodies to HIV are present (positive), the test is usually repeated to confirm the diagnosis. If ELISA is negative, other tests are not usually needed. This test has a low chance of having a false result after the first few weeks that a person is infected.

    147. The largest cell in the human body is :

    (1) Nerve cell 
    (2) Muscle cell
    (3) Liver cell 
    (4) Kidney cell
    Answer:
    147. (1) The ovum is the largest cell in the human body, typically visible to the naked eye without the aid of a microscope or other magnification device. The smallest is the male sperm cell, it is one-tenth of the diameter of a human hair. Now, it is true that neurons can have very long extensions or axons, the axon isn’t a cell, but a peripheral extension. The actual neuron is tiny compared to the egg cell.

    148. Which of the following is known an body builder ?

    (1) Protein
    (2) Carbohydrates
    (3) Vitamins
    (4) Fats
    Answer:
    148. (1) Proteins are large biological molecules consisting of one or more chains of amino acids. are essential nutrients for the human body. They are one of the building blocks of body tissue, and can also serve as a fuel source. As fuel, proteins contain 4 kcal per gram, just like carbohydrates and unlike lipids, which contain 9 kcal per gram.

    149. Which of the following tests helps in diagnosis of cancer ?

    (1) Urine test 
    (2) Blood test
    (3) Biopsy 
    (4) X-Ray
    Answer:
    149. (3) A biopsy is a medical test commonly performed by a surgeon or an interventional radiologist involving sampling of cells or tissues for examination. It is the medical removal of tissue from a living subject to determine the presence or extent of a disease. When cancer is suspected, a variety of biopsy techniques can be applied. An excisional biopsy is an attempt to remove an entire lesion. When the specimen is evaluated, in addition to diagnosis, the amount of uninvolved tissue around the lesion, the surgical margin of the specimen is examined to see if the disease has spread beyond the area biopsied. “Clear margins” or “negative margins” means that no disease was found at the edges of the biopsy specimen. “Positive margins” means that disease was found, and a wider excision may be needed, depending on the diagnosis.

    150. During dehydration what is the substance that is usually lost by the body ?

    (1) Sugar
    (2) Sodium chloride
    (3) Calcium phosphate
    (4) Potassium chloride
    Answer:
    150. (2) Sodium chloride, also known as salt, common salt, table salt or halite, is an ionic compound with the formula NaCl, representing equal proportions of sodium and chloride. It is used as a carrier for other ingredients, dehydrating agent, enzyme inhibitor and tenderizer.

    151. The animal which uses sounds as its ‘eyes’ is

    (1) Dog 
    (2) Cat
    (3) Snake 
    (4) Bat
    Answer:
    151. (4) Bat echolocation is a perceptual system where ultrasonic sounds are emitted specifically to produce echoes. By comparing the outgoing pulse with the returning echoes, the brain and auditory nervous system can produce detailed images of the bat’s surroundings. This allows bats to detect, localize and even classify their prey in complete darkness. At 130 decibels in intensity, bat calls are some of the most intense, airborne animal sounds.

    152. Pregnant women usually become deficient in

    (1) Sodium and Calcium
    (2) Iron and Sodium
    (3) Calcium and Iron
    (4) Magnesium and Iron
    Answer:
    152. (3) When a woman becomes pregnant her body undergoes many physiological changes. Her hormone levels change not only to support the pregnancy but also to help redirect nutrients to support the nutritional demands of the developing baby. During pregnancy, a woman’s blood volume increases 35 percent to 40 percent. Red blood cells contain the protein hemoglobin, which requires the mineral iron. Hemoglobin carries the oxygen to the cells throughout the mother and baby, making iron an important nutrient. Because the plasma volume increases by up to 50 percent but the red blood cells mass increases by only 15 percent to 20 percent, the risk of developing iron-deficiency anemia increases during pregnancy. Calcium needs increase during pregnancy to support the growth and development of the baby’s bones and teeth. Failing to consume the recommended 1,200 mg of calcium per day can cause body to pull calcium from the pregnant woman’s bones to use for the baby. This increases the risk of developing osteoporosis, a disease characterized by porous, brittle bones.

    153. Which components of light are absorbed by chlorophyll ?

    (1) Violet and red
    (2) Indigo and orange
    (3) Blue and red
    (4) Violet and yellow
    Answer:
    153. (1) Chlorophyll is a green pigment found in cyanobacteria and the chloroplasts of algae and
    plants. 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. However, it is a poor absorber of green and
    near-green portions of the spectrum, hence the green color of chlorophyll-containing tissues.

    154. Ginger is a stem and not a root because

    (1) It stores food material
    (2) It grows horizontally in the soil
    (3) It has nodes and internodes
    (4) It lacks chlorophyll
    Answer:
    154. (3) Ginger is a modified stem. A rhizome to be exact. A rhizome is a thick horizontally growing stem which usually stores food material. It has nodes and internodes, scale leaves, axillary buds, adventitous roots and a terminal bud. Scale leaves enclosing the axillary buds are seen arising from the nodal points of the stem. Some of the axillary buds develop into branches which grow upwards into the air and then produce normal green foliage leaves. Usually the growing points of the rhizome continue to remain underground causing an elongation of the rhizome. Roots develop from the lower surface of the rhizome. Eg. Ginger, Turmeric.

    155. Eyes of potato are useful for

    (1) Nutrition
    (2) Respiration
    (3) Reproduction
    (4) Vegetative propagation
    Answer:
    155. (4) Any potato variety can be propagated vegetatively by planting tubers, pieces of tubers, cut to include at least one or two eyes, or also by cuttings, a practice used in greenhouses for the production of healthy seed tubers. Some commercial potato varieties do not produce seeds at all (they bear imperfect flowers) and are propagated only from tuber pieces.

    156. Taenia solium (Tape worm) lives as a parasite in

    (1) Pig
    (2) Abdomen of man/woman
    (3) Intestine of man/woman
    (4) Liver of man/woman
    Answer:
    156. (3) Tapeworms are flat segmented worms that live in the intestines of some animals. Animals can become infected with these parasites when grazing in pastures or drinking contaminated water. Eating undercooked meat from infected animals is the main cause of tapeworm infection in humans. The adult tapeworm is usually a whopping 15 to 30 feet long (4.5 to 9 meters) and lives in the small intestine. An infected person usually has only one or two worms. The tapeworms use their head, called the scolex, to attach themselves to the intestinal wall.

    157. An ant can see the objects all around it due to the presence of

    (1) Simple Eyes
    (2) Eyes over the head
    (3) Well-developed eyes
    (4) Compound eyes
    Answer:
    157. (4) Compound eyes are found among the arthropods and are composed of many simple facets which, depending on the details of anatomy, may give either a single pixelated image or multiple images, per eye. Each sensor has its own lens and photosensitive cell(s). Some eyes have up to 28,000 such sensors, which are arranged hexagonally, and which can give a full 360° field of vision. Compound eyes are very sensitive to motion. With each eye viewing a different thing, a fused image from all the eyes is produced in the brain, providing very different, high-resolution images.

    158. What is the approximate time required for a heart-beat ?

    (1) 0.5 second 
    (2) 0.8 second
    (3) 0.5 minute 
    (4) 1.0 minute
    Answer:
    158. (2) The heart has an increasing rhythmic activity. It pumps blood by its contraction and relaxation. The contraction of the heart is called systole and the relaxation is called diastole. The contraction and
    relaxation together constitute the heart beat. The heart beats at the rate of 72 beats per minute. There are 3 main events in the cardiac cycle. Auricular Systole (Atrial Systole) phase involves the contraction of the 2 auricles, pushing the blood into the respective ventricles. The atrial systole takes 0.1 second.
    Ventricular Systole takes about 0.3 seconds. Ventricular systole is followed by ventricular diastole. The auricles are already in diastole, so all the chambers of the heart are in diastole. A complete cardiac diastole takes only 0.4 seconds. An entire cardiac cycle is completed in 0.8 seconds.

    159. Who discovered the Cholera-bacillus ?

    (1) Louis Pasteur
    (2) Ronald Ross
    (3) Robert Koch
    (4) Joseph Lister
    Answer:
    159. (3) Robert Kach was a German physician. He became famous for isolating Bacillus anthracis (1877), the Tuberculosis bacillus (1882) and Vibrio cholerae (1883) and for his development of Koch’s postulates. He was awarded the Nobel Prize in Physiology or Medicine in 1905 for his tuberculosis findings. He is considered one of the founders of microbiology.

    160. Which of the following animals has the longest life span ?

    (1) Elephant 
    (2) Crocodile
    (3) Dog 
    (4) Tortoise
    Answer:
    160. (4) Tortoises generally have lifespans comparable with those of human beings, and some individuals are known to have lived longer than 150 years. Because of this, they symbolize longevity in some cultures, such as China. The oldest tortoise ever recorded, and one of the oldest individual animals ever recorded, was Tu’i Malila, which was presented to the Tongan royal family by the British explorer Captain Cook shortly after its birth in 1777.

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