STD 12 - 1. sexual reproduction in flowering plants — BIOLOGY STD 12 Science — Question

$I.$ Colostrum is recommended for the new borns because it is rich in antigens.

$II.$ Chikungunya is caused by a Gram negative bacterium.

$III.$ Tissue culture has proved useful in obtaining virus-free plants.

$I V.$ Beer is manufactured by distillation of fermented grapes.

How many of the statement(s) is/are correct?

$I.$ Increase vitamin - $B_{12}$ amount, thus increasing nutrient quality of milk

$II.$ Checks disease causing microbes in stomach

Choose the correct option

$I.$ An Association of two species where one is benefitted and other remains unaffected is called mutualism.

$II.$ An interspecific association where both partners derive benefit from each other is called commensalism.

$III.$ A direct food relation between two species of animals in which one animal kills and feeds on another is referred as predation.

$IV.$ A relationship between two species of organisms where both are partners are

benefitted from each other is called symbiosis