Microorganisms

Euglena gracilis is a protist that has animal and plant-like characteristics. Because of its eyespot, Euglena exhibits phototaxis.
In an experiment, a culture of Euglena is placed in a petri dish and a piece of cardboard with a circle cut out of its center is placed over the petri dish, allowing light to enter only the center of the petri dish. After 30 minutes, the cardboard is removed and the culture is observed.
Which of these best describes the appearance of the Euglena culture after the 30 minutes?
At which stage of HIV infection, patient shows high titre of anti-P24 antibody?
Penicillin is bacteriolytic because
AIDS associated cancer is
Th correct sequence of plants in a hydrosere is