MCQOPTIONS
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MCQOPTIONS
This section includes 2103 Mcqs, each offering curated multiple-choice questions to sharpen your Current Affairs knowledge and support exam preparation. Choose a topic below to get started.
| 1901. |
O2 released in the process of photosynthesis comes from |
| A. | CO2 |
| B. | water |
| C. | sugar |
| D. | pyruvic acid |
| Answer» C. sugar | |
| 1902. |
Plant bends towards the source of light on account of the movement of curvature known as |
| A. | geotropism |
| B. | thigmotropism |
| C. | chemotropism |
| D. | phototropism |
| Answer» E. | |
| 1903. |
Most abundant tissues of our body are |
| A. | muscular |
| B. | connective |
| C. | epithelial |
| D. | nervous |
| Answer» C. epithelial | |
| 1904. |
Pigmentation of skin is due to |
| A. | lymphocytes |
| B. | monocytes |
| C. | leucocytes |
| D. | melanocytes |
| Answer» E. | |
| 1905. |
Rain water helps to increase the ____ to some extent. |
| A. | phosphorous contents |
| B. | nitrogen contents |
| C. | calcium contents |
| D. | potash contents |
| Answer» D. potash contents | |
| 1906. |
Outer covering of virus made up of protein is |
| A. | capsid |
| B. | coat |
| C. | virion |
| D. | viriod |
| Answer» B. coat | |
| 1907. |
Radish is a |
| A. | bulb |
| B. | conn |
| C. | modified root |
| D. | tuber |
| Answer» D. tuber | |
| 1908. |
Number of chromosomes in Down's syndrome is |
| A. | 46 |
| B. | 47 |
| C. | 48 |
| D. | 49 |
| Answer» C. 48 | |
| 1909. |
Primary phloem develops from |
| A. | lateral meristem |
| B. | protoderm |
| C. | extrastelar cambium |
| D. | provascular tissue |
| Answer» E. | |
| 1910. |
Plant development is influenced by |
| A. | quality of light only |
| B. | quality and quantity of light |
| C. | quality and duration of light |
| D. | quality, quantity and duration of light |
| Answer» E. | |
| 1911. |
Nymph is the name of young one of |
| A. | butterfly |
| B. | beetle |
| C. | housefly |
| D. | cockroach |
| Answer» E. | |
| 1912. |
Osmosis is the flow of solution from higher concentration to a solution of lower concentration through a semi permeable membrane. What is incorrect in this statement? |
| A. | Exact concentration of solution is not given |
| B. | Character of semi permeable membrane is not given |
| C. | The flow of solution is not possible through semi permeable membrane |
| D. | All are incorrect |
| Answer» D. All are incorrect | |
| 1913. |
Potato is a modified form (outgrowth) of |
| A. | root |
| B. | stem |
| C. | fruit |
| D. | leaf |
| Answer» C. fruit | |
| 1914. |
out of proteins, lipids and carbohydrates present in a cell membrane, what is true? |
| A. | Lipids are maximum |
| B. | Carbohydrates are minimum |
| C. | Carbohydrates are maximum |
| D. | All three are in equal proportion |
| Answer» C. Carbohydrates are maximum | |
| 1915. |
Ramapithecus and Cro-Magnon man are considered |
| A. | ancestors of modern man |
| B. | ancestors of monkey |
| C. | ancestors of lion |
| D. | None of the above |
| Answer» B. ancestors of monkey | |
| 1916. |
Our skin, when exposed to excess sunlight, becomes dark. This is because our skin pigments called |
| A. | flavoxanthin |
| B. | melanin |
| C. | carotene |
| D. | Xanthophyll |
| Answer» C. carotene | |
| 1917. |
Most of the red, blue and purple colours of plants are due to a pigment called |
| A. | anthocyanin |
| B. | carotene |
| C. | chlorophyll |
| D. | xanthophylls |
| Answer» B. carotene | |
| 1918. |
Plants growing on sand are called as |
| A. | chasmophytes |
| B. | oxylophytes |
| C. | lithophytes |
| D. | psammophytes |
| Answer» E. | |
| 1919. |
Poison glands of snakes are homologous to |
| A. | electric organs of fishes |
| B. | stings of rays |
| C. | sebaceous glands of mammals |
| D. | salivary glands of vertebrates |
| Answer» E. | |
| 1920. |
Plants wilt due to excess of |
| A. | transpiration |
| B. | photosynthesis |
| C. | absorption |
| D. | None of these |
| Answer» B. photosynthesis | |
| 1921. |
Nitrogen is fixed in ecosystems in ways stated below. Which one of the statements below is false? |
| A. | By cyanobacteria |
| B. | By electrical discharges in the atmosphere |
| C. | By industrially synthesised fertilizer |
| D. | By denitrification |
| Answer» E. | |
| 1922. |
Pollen grains in plants are produced in |
| A. | roots |
| B. | leaves |
| C. | flower |
| D. | stem |
| Answer» D. stem | |
| 1923. |
Ptyalin is an enzyme produced in the |
| A. | salivary glands |
| B. | pituitary glands |
| C. | thyroid glands |
| D. | pancreas |
| Answer» B. pituitary glands | |
| 1924. |
Myopia is connected with |
| A. | ears |
| B. | eyes |
| C. | lungs |
| D. | None of these |
| Answer» C. lungs | |
| 1925. |
Placenta is the structure formed |
| A. | by the union of foetal and uterine tissue |
| B. | by foetus only |
| C. | by fusion of germ layers |
| D. | None of these |
| Answer» B. by foetus only | |
| 1926. |
Plants developing in dry conditions are |
| A. | xerophytes |
| B. | mesophytes |
| C. | lithophytes |
| D. | hydrophytes |
| Answer» B. mesophytes | |
| 1927. |
Plants are killed in winter by frost |
| A. | because of desiccation and mechanical damage to the tissues |
| B. | because no photosynthesis takes place at such low temperature |
| C. | because respiration ceases at such low temperature |
| D. | because there is no transpiration |
| Answer» B. because no photosynthesis takes place at such low temperature | |
| 1928. |
Our major foods, fibres, spices, fruits and beverage crops are |
| A. | flowering plants |
| B. | gymnosperms plants |
| C. | pteridophytes |
| D. | bryophytes |
| Answer» B. gymnosperms plants | |
| 1929. |
Monotremes are unique mammals because they |
| A. | posses hair |
| B. | give birth to live young |
| C. | secret milk in a pouch |
| D. | lay eggs |
| Answer» E. | |
| 1930. |
Prothrombin which helps in clotting of blood is released by |
| A. | lymphocytes |
| B. | erythrocytes |
| C. | monocytes |
| D. | blood platelets |
| Answer» E. | |
| 1931. |
Phloem is a tissue found in |
| A. | reproductive organs of animals |
| B. | plants |
| C. | insects |
| D. | mammals |
| Answer» C. insects | |
| 1932. |
Nucleus, the genetic material containing rounded body in each cell, was first discovered in 1831 by |
| A. | Robert Hooke |
| B. | Robert Brown |
| C. | Rudolf Virchow |
| D. | Theodore Schwann |
| Answer» C. Rudolf Virchow | |
| 1933. |
N2 content is kept constant in the biosphere due to |
| A. | N2 fixation |
| B. | industrial pollution |
| C. | nitrogen cycle |
| D. | absorption of N2 |
| Answer» D. absorption of N2 | |
| 1934. |
On which of the following plants did Gregor Mendal perform his classical experiment? |
| A. | Gram |
| B. | Maize |
| C. | Pea |
| D. | Wheat |
| Answer» D. Wheat | |
| 1935. |
Oxygen in our blood is transported by a protein named |
| A. | haemoglobin |
| B. | keratin |
| C. | collagen |
| D. | myoglobin |
| Answer» B. keratin | |
| 1936. |
One day you wake with a sore throat and a runny nose. Your doctor takes a swab from your throat, sends it to a lab, and telephones you the next day to say that antibiotic will not help you get better. Which of the following is the most likely reason for the doctor's statement? |
| A. | Having waited a day, it is too late to take an antibiotic |
| B. | You need an antiseptic, not an antibiotic |
| C. | You need to be vaccinated instead of taking an antibiotic |
| D. | You are infected by a virus |
| Answer» E. | |
| 1937. |
Plants absorb dissolved nitrates from soil and convert them into |
| A. | free nitrogen |
| B. | urea |
| C. | ammonia |
| D. | proteins |
| Answer» B. urea | |
| 1938. |
Photosynthesis generally takes place in which parts of the plant? |
| A. | Leaf and other chloroplast bearing parts |
| B. | stem and leaf |
| C. | Roots and chloroplast bearing parts |
| D. | Bark and leaf |
| Answer» B. stem and leaf | |
| 1939. |
Movement of cell against concentration gradient is called |
| A. | osmosis |
| B. | active transport |
| C. | diffusion |
| D. | passive transport |
| Answer» C. diffusion | |
| 1940. |
Most fish do not sink in water because of the presence of swim bladderair bladderair sacsair in spongy bones |
| A. | I and II are correct |
| B. | II and III are correct |
| C. | III and IV are correct |
| D. | I, II, III and IV are correct |
| Answer» B. II and III are correct | |
| 1941. |
Plants hormone that induces cell division is |
| A. | auxins |
| B. | gibberellins |
| C. | kinins |
| D. | domins |
| Answer» D. domins | |
| 1942. |
Out of 900 reported species of living gymnosperms, conifers are represented by about 500 species, About 2,50,000 species of angiosperms (flowering plants) have also been reported in the world. The vast and dominant woodlands in Europe, Asia, North America and mountains such as Himalayas are wooded with |
| A. | all gymnosperms, except conifers |
| B. | only angiosperms |
| C. | only conifers |
| D. | angiosperms and all gymnosperms except conifers |
| Answer» D. angiosperms and all gymnosperms except conifers | |
| 1943. |
Of the following taxonomic categories which is the most inclusive (i.e. is the highest in hierarchy)? |
| A. | Order |
| B. | Subspecies |
| C. | Class |
| D. | Genus |
| Answer» D. Genus | |
| 1944. |
Mycobacterium leprae causes leprosy, Corynebacterium diphtheria causes diphtheria and Vibrio comma causes |
| A. | tetanus |
| B. | influenza |
| C. | cholera |
| D. | typhoid |
| Answer» D. typhoid | |
| 1945. |
One of the following is most suitable for study of mutations |
| A. | Haploids |
| B. | Diploids |
| C. | Tetraploids |
| D. | Polyploid |
| Answer» B. Diploids | |
| 1946. |
Organic Substances which, in very small amounts, control growth and development called |
| A. | vitamins |
| B. | hormones |
| C. | enzymes |
| D. | None of the above |
| Answer» C. enzymes | |
| 1947. |
Radical vascular bundles are those in which |
| A. | xylem is surrounded by phloem |
| B. | phloem is surrounded by xylem |
| C. | xylem and phloem occur on the same radius |
| D. | xylem and phloem occur on the different radii |
| Answer» E. | |
| 1948. |
One of the following is not a function of bones. |
| A. | Place for muscle attachment |
| B. | Protection of vital organs |
| C. | Secretion of hormones for calcium regulation in blood and bones |
| D. | Production of blood corpuscles |
| Answer» D. Production of blood corpuscles | |
| 1949. |
Neurospora is used as genetic material because |
| A. | it has short life cycle of 10 days |
| B. | the product of single meiosis can be easily analysed |
| C. | meiotic products are linearly arranged in the form of ordered tetrads |
| D. | is a diploid fungus |
| Answer» B. the product of single meiosis can be easily analysed | |
| 1950. |
Pollination by wind is called |
| A. | anemophily |
| B. | hydrophily |
| C. | zoophily |
| D. | entomophily |
| Answer» B. hydrophily | |