Biology 2nd Year
MCQs
Chapter No.2
Support and Movement

21. Which of the following hormones plays major role in phototropism?

• Auxin
• Gibberellin
• Abcissic acid
• None of these

22. It is believed that during phototropism?

• Auxin is unequally distributed
• Auxin enlarges the cells unequally
• bend is caused towards source of light
• All of these

23. Haptonasti is because of

• Auxins
• Gibberellins
• Abscisic acid
• Ethylene

24. The growth movements of plant organs which are induced by external stimuli are called;

• Nastic
• Paratonic
• Tropic
• Turgor

25. The shoot is negatively geotropic as well as negatively;

• Hydrotropic
• Phototropic
• Chemotropic
• Thiqmotropic

26. The fluctuations of light and temperature induce nastic movements in many leaves and;

• Stem
• Roots
• Flowers
• Branches

27. The movement of leaves of bean plant in the evening is considered as:

• rapid movement of leaflets
• phototactic movement
• epinasty
• sleep movement

28. The type of movement involved in the opening of buds is:

• epinasty
• hyponasty
• nyctinasty
• nutation

29. The movement of sperms of liverworts ,mosses & ferns towards the archegonia

• chemotropic
• chemonastic
• chemotactic
• hydrotropic

30. How many type of skeleton are present In animals

• Two
• Three
• Four
• Five