Biology Times (^) March 19
(a) short day plant and actually measures day
length to flower
(b) short day plant and actually measures night
length to flower
(c) long day plant and actually measures night
length to flower
(d) long day plant and actually measures day
length to flower
- A ripe mango, kept with unripe mangoes causes
their ripening. This is due to the release of a
gaseous plant hormone
[2012]
(a) auxin (b) gibberlin
(c) cytokinine (d) ethylene - Fruit wrapped in paper ripens faster than when
kept in open air because [2010]
(a) Heat of respiration is retained better
(b) A chemical in the paper helps fruit ripening
(c) A volatile substance produced by the fruit is
retained better and helps in ripening
(d) The fruit is cut off from the ambient oxygen
which is an inhibitor to fruit repening
Structural organisation in animals- a 2. b 3. c 4. d 5. d
- a
Molecular basis of inheritance- c 2. a 3. d 4. d 5. a
- c 7. c 8. b 9. a 10. a
- a 12. a 13. b 14. c 15. a
- a 17. b 18. d 19. a 20. a
- b 22. b 23. b 24. b 25. d
- a 27. d 28. b 29. a 30. a
- a 32. d 33. b 34. b
Excretory products and their elimination- c 2. c
Microbes in human welfare- c
Plant growth and development- b 2. d 3. c
Structural organisation in animals1.Sol: Gapjunctions are cytoplasmic commmunicat-
ions between two epithelial cells for rapid transfer
of some ions and small molecule
2.Sol: Salivary gland is multicellular exocrine gland,
made up cuboidal epithelium
3.Sol: Ciliated epithelium are simple epithelial cells
which have presence of fine hair like outgrowth
called cilia on its free surface. Function of
ciliated epithelium is to move particles in specific
direction. Cilia of ciliated epithelium will sweep
bacteria and dust particles in organs of respiratory
tract and protect them from infection.
4.Sol: Liver and muscle stores glycogen. It is
converted into glucose when the blood glucose
level falls.
5.Sol: Brown fat helps in conservation of body heat.
6.Sol: When a person starts to fast glycogen stored in
liver gets converted into glucose under influence
of glucagon hormone. This process is called
Glycogenolysis.