Little leaf of brinjal is caused by

Assertion: Chemosynthesis is an autotrophic nutrition.
Reason: Chemoautotrophs contain chlorophyll pigments.

Which of the following statements are incorrect for $Nostoc$ and $Anabaena$?
$(a)$. Possess tissue level organization
$(b)$. Have heterocysts
$(c)$. Can fix atmospheric hydrogen
$(d)$. They are eubacteria

Organisms that can survive in high temperatures and thrive in highly acidic $(pH = 2)$ habitats belong to which group?

The cells of the bacterium $Staphylococcus$ remain arranged in the form of:

Which of the following are likely to be present in deep sea water?