Biology MCQs

11. Which of the following is the reason behind bleeding through nose in high mountain regions? (UPSC Prelims 1979).
[A] The pressure of the blood capillaries is higher than the outside pressure
[B] The pressure at high altitudes is greater than that in the plains
[C] The blood pressure increases at high altitudes
[D] The blood pressure decreases at high altitudes

Show Answer

12. Seed germination takes place in which of the following layers of soil profile?
[A] Organic layer
[B] Surface/A layer
[C] B layer
[D] C layer

Show Answer

13. How may cultivated species contribute to food production globally?
[A] 200
[B] 400
[C] 1000
[D] 900

Show Answer

14. The theory of DNA structure and nature was propounded by __?
[A] Oswald Avery
[B] James Black
[C] Watson and Crick
[D] John Eccles

Show Answer

15. What type of embryo is most often used for viral assays?
[A] Mouse
[B] Rat
[C] Cat
[D] Chicken

Show Answer

16. Which one of the following plants has seeds but no flowers and fruits?
[A] Bryophytes
[B] Gymnosperms
[C] Mosses
[D] Pteridophytes

Show Answer

17. Which of the following may be most likely to be missing from a gram-positive bacterium?
[A] Penicillin-binding protein
[B] Peptidoglycan
[C] Lipopolysaccharide
[D] Phospholipid bilayer membrane

Show Answer

18. What are the characteristics of Pteridophyta?
[A] They are cryptogams, seedless and vascular
[B] The plant body has true roots, stem and leaves
[C] Spores develop in sporangia
[D] All of the above

Show Answer

19. What is the common name of pteridophytes?
[A] Ferns
[B] conifers
[C] flowering plant
[D] None of these

Show Answer

20. In ferns, the leaves during young conditions are called__?
[A] Scale leaf
[B] Sporophyll
[C] Circinate Ptyxis
[D] None of these

Show Answer