Being photosynthetic,which organism in absence of sunlight behaves like a heterotroph?

The organism shown in the figure is .........

What is the ecological importance of slime moulds?

Which of the following groups of kingdom $Protista$ is being described in the statements given below?
$(i)$ This group includes diatoms and golden algae.
$(ii)$ They are microscopic and float passively in water currents (plankton).
$(iii)$ Most of them are photosynthetic.
$(iv)$ They have deposits in their habitat; this accumulation over billions of years is referred to as 'diatomaceous earth'.

Pseudopodia is a characteristic feature of which class?

Which of the following organisms resembles the ancestral form from which both animals and plants are believed to have evolved?