Biology MCQs

11. Sulphur Dioxide pollution is indicated by an excessive growth of which of the following?

by
A. Algal Blooms
B. Lichens
C. Bryophytes
D. Protozoa
✅ The correct answer is option B.
If air is polluted with sulphur dioxide, then lichens will die in that particular environment. Since the era of industrialization, many species of lichens have gone extinct. Due to this property, lichens are considered to be the indicators of the air pollution.

13. Movement of cell against concentration gradient is called

by
osmosis
active transport
diffusion
passive transport
✅ The correct answer is option B.
Active transport, this is the only transport method that can move species against their concentration gradient (from low to high concentration). Facilitated diffusion only moves species down their concentration gradient from high to low concentration.