Biology MCQs

1. Whch among the following are called scavengers of ecosystems?
[A] Bacteria
[B] Fungi & Bacteria
[C] Algae, Fungi & Bacteria
[D] None of the above

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2. It has been demonstrated by the scientists that, certain wines such as Red Wine posses health benefits because they contain antioxidants, which work in the body as Free Radical Scavengers and slow the oxidation of other molecules by capturing the free radicals. Which among the following is the most common antioxidant found in Red Wine?
[A] Catechin
[B] Tetrodotoxin
[C] Polyphenol
[D] Tocopherol

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3. The cells of all living biological matter are made of four major elements. The elements are: 
[A] Carbon, Hydrogen, Oxygen and Phosphorous
[B] Carbon, Hydrogen, Oxygen and Nitrogen
[C] Carbon, Hydrogen, Oxygen and Sulphur
[D] Sodium, Chlorine, Potassium and Magnesium

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4. Which of the following branches of Biology is concerned with the effects of radiation on living organisms?
[A] Actinobiolgy
[B] Cryobiology
[C] Cytogenetics
[D] Aerobiology

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5. Which of the following is not a feature of organisms in the class Mammalia ?
[A] milk producing mammary glands
[B] cells with a membrane-bounded nucleus
[C] dorsal hollow nerve chord
[D] chitin in the cell membrane

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6. Which part of the plant is used in making saffron spice?
[A] Stigma
[B] Sepal
[C] Petal
[D] Leaf

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7. Why honey bees are called social insects? (UPSC Prelims 1982)
[A] They visit all flowers to collect nectar
[B] They live in large family groups
[C] They depend for their food upon other insects
[D] They move socially with other insects

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8. Why man cannot digest cellulose whereas cows can do so? (UPSC Prelims 1992)
[A] Their gut contains certain bacteria capable of digesting cellulose
[B] They have a many-chambered stomach
[C] They have efficient grinding molars
[D] They produce enzyme cellulose which can digest cellulose

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9. Which among the following is the name given to the ductless and secretory glands in the human body? (UPSC Prelims 1997)
[A] Endocrine glands
[B] Exocrine glands
[C] Salivary glands
[D] None of the above

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10. Which vitamin helps in the clotting of blood?
[A] Vitamin C
[B] Vitamin B
[C] Vitamin K
[D] Vitamin E

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