Sharks and dogfishes differ from skates and rays by
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(a) Their pectoral fins distinctly marked off from cyclindrical bodies (b) Gill slits are ventrally placed (c) Head and trunk are widened considerably (d) […]
Select the correct option with respect to cockroaches
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(a) The fore wings are tegmina which are used in flight (b) Malpighian tubules convert nitrogenous wastes into urea (c) Males bear short anal […]
The characteristics of class Reptilia are :
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(a) Body covered with dry and cornified skin, scales over the body are epidermal, they do not have external ears (b) Body covered with moist […]
The term ‘glycocalyx’ is used for
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(a) A layer surrounding the cell wall of bacteria (b) A layer present between cell wall and membrane of bacteria (c) Cell wall of bacteria (d) Bacterial […]
Why is a capsule advantageous to a bacterium?
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(a) It allows the bacterium to attach to the surface (b) It protects the bacterium from desiccation (c) It provides means of locomotion (d) It […]
Tissue culture technique can produce infinite number of new plants from a small parental tissue. The economic importance of the technique is in raising
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(a) Variants through picking up somaclonal variations (b) […]
Which one of the following statements is correct?
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(a) Geitonogamy involves the pollen and stigma of flowers of different plants (b) Clestogamous flowers are always autogamous (c) Xenogamy occurs only by wind […]
Which of the following statements about Sporopollenin is correct?
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(a) Sporopollenin can withstand high temperatures but not strong acids (b) Sporopollenin can be degraded by enzymes (c) Sporopollenin is made up of […]
Which one of the following statements is not true about somatic embryogenesis?
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(a) A somatic embryo develops from a somatic cell (b) The pattern of development of a somatic embryo is comparable […]
Which of the following statements is correct regarding Sexually Transmitted Diseases (STD)?
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(a) The chances of a 5 year boy contacting a STD are very little (b) A person may contact syphilis […]
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