Biology

Good vision depends on adequate intake of carotene rich food. Select the best option from the following statements. (a) Vitamin A derivatives are formed from carotene. (b) The photopigments are embedded in the membrane discs of the inner segment. (c) Retinal is a derivative of Vitamin A. (d) Retinal is light absorbing part of all […]

A baby boy aged two years is admitted to play school and passes through a dental check-up. The dentist observed that the boy had twenty teeth. Which teeth were absent? Option 1 : CaninesOption 2 : Pre-molarsOption 3 : MolarsOption 4 : Incisors

Which cells of ‘Crypts of Lieberkuhn’ secrete antibacterial lysozyme? Option 1 : Zymogen cellsOption 2 : Kupffer cellsOption 3 : Paneth cellsOption 4 : Argentaffin cells

Root hairs develop from the region of Option 1 : Meristematic activityOption 2 : ElongationOption 3 : Root capOption 4 : Maturation

Which one of the following is related to ex situ conservation of threatened animals and plants? Option 1 : Amazon rainforestOption 2 : Wildlife safari parksOption 3 : Biodiversity hot spotsOption 4 : Himalayan region

Mycorrhizae are the example of Option 1 : MutualismOption 2 : AmensalismOption 3 : FungistasisOption 4 : Antibiosis

Select the mismatch: Option 1 : Frankia                         AlnusOption 2 : Rhodospirillum          MycorrhizaOption 3 : Anabaena                     Nitrogen fixerOption 4 : Rhizobium                   Alfalfa

Frogs heart when taken out of the body continues to beat for some time. Select the best option from the following statement. (a) Frog is a poikilotherm. (b) Frog does not have any coronary circulation. (c) Heart is ‘myogenic’ in nature. (d) Heart is autoexcitable. Option 1 : Only (c)Option 2 : Only (d)Option 3

The DNA fragments separated on an agarose gel can be visualized after staining with Option 1 : Aniline blueOption 2 : AcetocarmineOption 3 : Bromophenol blueOption 4 : Ethidium bromide