Question Bank No: 3

1. Phytochrome is associated with

 a)Pr and Pfr reactions
 b)Absorption of red light of 660 nm
 c)Absorption of far-red light of 740 nm
 d)Absorption of blue-light by leaves

2. What is a stress hormone? or The hormone produced during adverse environmental conditions is

 a)Benzyl aminopurine
 b)Dichlorophenoxy acetic acid
 c)Ethylene
 d)Abscisic acid

3. Flowering dependent on cold treatment is

 a)Cryotherapy
 b)Cryogenics
 c)Cryoscopy
 d)Vernalisation

4. Fruit ripening is accelerated by

 a)Warm surroundings
 b)Increased nitrogen supply
 c)Reduced water supply
 d)Ethylene rich atmosphere

5. Gibberellic acid induces flowering in

 a)Some plants only
 b)Long day plants under short day conditions
 c)Short day plants under long day conditions
 d)Day neutral plants

6. Highest auxin concentration occurs

 a)In growing tips
 b)In leaves
 c)At base of plant organs
 d)In xylem and phloem

7. The hormone responsible for apical dominance is

 a)IAA
 b)GA
 c)ABA
 d)Florigen

8. Hormone primarily connected with cell division is

 a)IAA
 b)NAA
 c)Cytokinin/Zeatin
 d)Gibberellic acid

9. Which of the following is used in root formation on stem cuttings?

 a)Kinetin
 b)GA3
 c)ABA
 d)IBA

10. Ethylene is

 a)A gaseous metabolite
 b)A gaseous enzyme
 c)A gaseous hormone
 d)A solid hormone

11. Phytochrome is involved in

 a)Phototropism
 b)Photorespiration
 c)Photoperiodism
 d)Geotropism

12. Higher concentration of some synthetic auxins is used for

 a)Weed control
 b)Rooting of stem cutting
 c)Parthenocarpy
 d)Increasing fruit yield

13. Phytotron is a device by which

 a)Electrons are bombarded
 b)Protons are liberated
 c)Plants are grown in controlled environment
 d)Mutations are produced in plants

14. Growth hormone responsible for apical dominance is

 a)Auxin
 b)Cytokinin
 c)Gibberellin
 d)Ethylene

15. Artificial ripening of fruits is accomplished by treatment with

 a)Sodium chloride
 b)IAA
 c)Ethylene gas
 d)Kinetin

16. I.A.A stands for

 a)Indole - 3-Acetic Anhydride
 b)Indole - 3-Acetic Acid
 c)Indole - 3-Aceto-acetate
 d)Indole - 3-Acetoacetic acid

17. Which one of the following is a natural growth inhibitor?

 a)NAA
 b)ABA
 c)IAA
 d)GA

18. Tendrils exhibit/twining of tendrils is due to

 a)Thigmotropism
 b)Seismonasty
 c)Heliotropism
 d)Diageotropism

19. Endosperm/endosperm nucleus of angiosperms is generally

 a)Haploid
 b)Diploid
 c)Triploid
 d)Tetraploid

20. Developemnt of shoot and root in tissue culture is determined by

 a)Cytokinin and auxin ratio
 b)Enzymes
 c)Temperature
 d)Plant nutrients

21. Haploid plant cultures are got from

 a)Leaves
 b)Root tip
 c)Pollen grain
 d)Buds

22. In angiosperms the number of meiotic divisions required to produce 100 microspores is

 a)125
 b)100
 c)50
 d)25

23. Total number of meiotic division required for forming 100 zygotes/100 grains of wheat is

 a)100
 b)75
 c)125
 d)50

24. Triploid tissue is

 a)Endosperm in Maize/Wheat/Lily
 b)Leaf in Onion/Bryophyllum/Pinus
 c)Root in Onion/Radish/Carrot
 d)Fern prothallus

25. Double fertilization is fusion of

 a)Two eggs
 b)Two eggs and polar nuclei with pollen nuclei
 c)One male gamete with egg and other with synergid
 d)One male gamete with egg and other with secondary nucleus

26. Double fertilization is characteristic of

 a)Angiosperms
 b)Pteriodophytes
 c)Gymnosperms
 d)Bryophytes

27. Double fertilization and triple fusion were discovered by

 a)Hofmeister
 b)Nawaschin and Guignard
 c)Leeuwenhoek
 d)Strasburger

28. Ovule is straight with funiculus, embryo sac, chalaza and micropyle lying on one straight line. It is

 a)Orthotropous
 b)Anatropous
 c)Campylotropous
 d)Amphitropous

29. Female gametophyte of angiosperms is represented by

 a)Ovule
 b)Megaspore mother cell
 c)Embryo sac
 d)Nucellus

30. Meiosis is best observed in dividing

 a)Cells of apical meristem
 b)Cells of lateral meristem
 c)Microspores and anther wall
 d)Microsporocytes

31. Ovule is attached to the placenta by a stalk named

 a)Funicle
 b)Petiole
 c)Pedicel
 d)Placenta

32. The innermost wall layer of pollen sac is tapetum. Its function is in

 a)Protection
 b)Nutrition
 c)Dehiscence
 d)Mechanical strength

33. Palynology is connected with the study of

 a)Pollen grains
 b)Palms
 c)Flowers
 d)Fruits

34. An anther contains

 a)Four microsporangia
 b)Three microsporangia
 c)Two microsporangia
 d)One microsporangium

35. Microspore mother cell forms

 a)Microsporangium
 b)Pollen sac
 c)Pollen grains
 d)Male gametes

36. Part of anther which produces both enzymes and hormones is

 a)Archesporium
 b)Middle layers
 c)Endothecium
 d)Tapetum

37. Gibberellin was first discovered from

 a)Algal
 b)Fungi
 c)Bacteria
 d)Roots of higher plants