Biology MCQs Archives

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

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.

12. Ozone hole refers to

hole in ozone layer

decrease in the ozone layer in troposphere

decrease in thickness of ozone layer in stratosphere

increase in the thickness of ozone layer in troposphere

✅ The correct answer is option C.

13. Movement of cell against concentration gradient is called

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.

14. Plants receive their nutrients mainly from

chlorophyll

atmosphere

light

soil

✅ The correct answer is option D.

15. Pine, fir, spruce, cedar, larch and cypress are the famous timber-yielding plants of which several also occur widely in the hilly regions of India. All these belong to

angiosperms

gymnosperms

monocotyledons

dicotyledons

✅ The correct answer is option B.

16. Ordinary table salt is sodium chloride. What is baking soda?

Potassium chloride

Potassium carbonate

Potassium hydroxide

Sodium bicarbonate

✅ The correct answer is option D.

17. Pollination is best defined as

transfer of pollen from anther to stigma

germination of pollen grains

growth of pollen tube in ovule

visiting flowers by insects

✅ The correct answer is option A.

18. Plants synthesis protein from

A. starch

B. sugar

C. amino acids

D. fatty acids

✅ The correct answer is option C.

19. Other than spreading malaria, anopheles mosquitoes are also vectors of

A. dengue fever

B. filariasis

C. encephalitis

D. yellow fever

✅ The correct answer is option B.

20. One of the following is most suitable for study of mutations

A. Haploids

B. Diploids

C. Tetraploids

D. Polyploid

✅ The correct answer is option A.