Biology MCQs

Notes:
An accessory fruit (sometimes called false fruit, spurious fruit, pseudo-fruit, or pseudo-carp) is a fruit in which some of the flesh is derived not from the ovary but from some adjacent tissue exterior to the carpel. Examples of accessory tissue are the receptacle of strawberries, figs, or mulberries, and the calyx of Gaultheria procumbens or Syzygium jambos. Pomes, such as apples and pears, are also accessory fruits, with much of the fruit flesh derived from a hypanthium.

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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 and octopuses.

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New born babies and children normally breathe faster than older children and adults. Their respiratory rate is about 30-60 breaths per minute. The respiratory rate for the different age-categories of children is:-6-12 months: 24-30; 1-5 years: 20-30; 6-12 years: 12-20.

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Cause of night blindness is a deficiency of retinol, or vitamin A, found in fish oils, liver, dairy products, vegetable and fruits yellow in colour. Nyctalopia also called “Night Blindness” is a condition making it difficult or impossible to see in relatively dim light. To over come deficiency of vitamin-A, one needs to feed of food products rich in carotene which is used in synthesis of vitamin-A is liver.

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Gymnosperm are flowerless plant that produces cones and seeds. The term gymnosperm literally means “naked seed”, as gymnosperm seed are not encased within an ovary. Rather they sit exposed on the surface of the leaf like structures called bracts.

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The sugar present in DNA is 2-deoxyribose, which is a pentose sugar. Deoxyribose is one of the three components of nucleotides, the building blocks of DNA. Each nucleotide consists of a phosphate group, a nitrogenous base—adenine (A), thymine (T), cytosine (C), or guanine (G)—and deoxyribose.

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Mangifera indica is commonly known as mango. It is a species of flowering plant in the sumac and poison ivy family Anacardiaceae. It is found in the wild in Bangladesh, India and Pakistan where it is indigenous. It is the national fruit of India, Pakistan and the Philippines.

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Researchers, in October 2011, found “giant amoebas” (Xenophyophores) beneath the surface of the Pacific in the Mariana Trench. At more than four inches in length, they are the largest single-celled organism on Earth. They are found exclusively in the deep sea.

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Plants have two different types of ‘transport’ tissue. Xylem transports water and solutes from the roots to the leaves, phloem transports food from the leaves to the rest of the plant. Comparison of xylem and phloem Tissue Process What is moved Structure Xylem Transpiration Moves water Columns of hollow, and minerals dead reinforced cells from roots to leaves Phloem Translocation Moves food Columns of substances from living cells leave to rest of plant.

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Crabs come from the same family as lobsters, crayfish, shrimp, krill and barnacles, as all are in the subphylum crustacea. They are also in the phylum Arthropoda, which includes insects, arachnids and crustaceans. They are decapods (having ten legs) and form an order within the decapods, called the Brachyura.