MCQOPTIONS
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MCQOPTIONS
This section includes 32 Mcqs, each offering curated multiple-choice questions to sharpen your Biology knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
Which of the following plant hormone substitutes for long photoperiods in flowering plants [CPMT 1990; BHU 2004] |
| A. | Auxins |
| B. | Gibberellins |
| C. | Cytokinins |
| D. | Ethylene |
| Answer» C. Cytokinins | |
| 2. |
Gibberellins were first discovered in fungal genus [MP PMT 1999] |
| A. | Mucor |
| B. | Rhizopus |
| C. | Agaricus |
| D. | Fusarium |
| Answer» E. | |
| 3. |
Gibberellins cause or Gibberellins stimulate [BHU 1988; CPMT 1988; RPMT 1984] |
| A. | Elongation of internodes |
| B. | Curvature of coleoptile |
| C. | Cell division |
| D. | Initiation of lateral roots |
| Answer» B. Curvature of coleoptile | |
| 4. |
The ripening of fruits can be hastened by treatment with [CPMT 1994, 2001, 03; BHU 1990, 95, 2000; AMU 1989; MP PMT 1994; KCET 2000] |
| A. | Gibberellic acid |
| B. | Indole acetic acid |
| C. | Florigen |
| D. | Ethylene gas |
| Answer» E. | |
| 5. |
Which hormone induces fruit ripening [Orissa JEE 2004; HP PMT 2005] |
| A. | Auxin |
| B. | Cytokinin |
| C. | Gibberellin |
| D. | Ethylene |
| Answer» E. | |
| 6. |
Ethylene gas [BHU 1985, 94; CPMT 1989] |
| A. | Is a saturated hydrocarbon |
| B. | Slows down the ripening of apples |
| C. | Retards ripening of tomatoes |
| D. | Speeds up maturation of fruits and early ripening of some fruits |
| Answer» E. | |
| 7. |
For plant tissue culture, among the following which one is required [BHU 1983] |
| A. | Trypsin |
| B. | Kinetin |
| C. | Caffeine |
| D. | Coumarine |
| Answer» C. Caffeine | |
| 8. |
Cytokinins are formed in [BVP 2004] |
| A. | Roots |
| B. | Leaves |
| C. | Fruits |
| D. | Stems |
| Answer» B. Leaves | |
| 9. |
The cut flowers and vegetables can be kept fresh a long period by this plant hormone [Kerala PMT 2004] |
| A. | Gibberellins |
| B. | Cytokinins |
| C. | Auxins |
| D. | Ethylene |
| E. | 2,4-dichlorophenoxy actic acid |
| Answer» C. Auxins | |
| 10. |
The chief role of cytokinin is |
| A. | To check senescence |
| B. | To check evaporation |
| C. | To check abscission |
| D. | To mobilise solutes to different parts of plant and check senescence |
| Answer» E. | |
| 11. |
Cambial tissue of Pinus radiata contains |
| A. | Auxins |
| B. | Gibberellins |
| C. | Cytokinin |
| D. | None of the above |
| Answer» D. None of the above | |
| 12. |
Discovery of which one of following is connected with the use of an old sample of DNA in a culture medium |
| A. | Cytokinins |
| B. | ABA |
| C. | Vitamin K |
| D. | Pantothanic acid |
| Answer» B. ABA | |
| 13. |
A plant placed near a window bends outwards because [CPMT 1989] |
| A. | Its tip is able to get more oxygen |
| B. | Its tip is able to obtain more light |
| C. | Its tip is able to receive necessary warmth |
| D. | The auxin contents on the shadow side is higher than that on the lighter side and as a result the shaded side elongate more than the cells on the illuminated side and the tip bends outwards |
| Answer» E. | |
| 14. |
What will be the effect on phytochrome in a plant subjected to continuous red light [CBSE PMT 1997] |
| A. | Level of phytochrome will decrease |
| B. | Phytochrome will be destroyed |
| C. | Phytochrome synthesis will increase |
| D. | None of these |
| Answer» E. | |
| 15. |
Agenetically dwarf plant can be converted into a tall plant by the use of [MP PMT 1996] |
| A. | Kinetin |
| B. | \[G{{A}_{3}}\] |
| C. | IAA/X-rays |
| D. | 2, 4-D |
| Answer» C. IAA/X-rays | |
| 16. |
During cell enlargement phase of growth, molecules of new cell wall material are inserted between the original molecules of stretched wall. This process is known as [DPMT 1980] |
| A. | Intussusception |
| B. | Apposition |
| C. | Integration |
| D. | None of the above |
| Answer» B. Apposition | |
| 17. |
Pollen extract stimulates the formation of fruit in the unpollinated carpel because extract has the following hormone [AMU 2005] |
| A. | Auxin |
| B. | Cytokinin |
| C. | Gibberellin |
| D. | Auxin and cytokinin |
| Answer» B. Cytokinin | |
| 18. |
Auxin in plant is not means for [BHU 2003] |
| A. | Cell elongation |
| B. | Fruit ripening |
| C. | Cell division |
| D. | Inhibit the root growth |
| Answer» C. Cell division | |
| 19. |
Parthenocarpy is induced by [AIIMS 1990; KCET 1994] |
| A. | ABA |
| B. | Auxins |
| C. | Zeatin |
| D. | Cytokinin |
| Answer» C. Zeatin | |
| 20. |
The movement of auxin is largely [CBSE PMT 2000] |
| A. | Basipetal |
| B. | Acropetal |
| C. | Centripetal |
| D. | Centrifugal |
| Answer» B. Acropetal | |
| 21. |
During germination, stem grows upward and root goes downward because [CPMT 1995] |
| A. | It depends upon light |
| B. | Of auxin |
| C. | It does not depend on light |
| D. | Of epinasty and hyponasty |
| Answer» C. It does not depend on light | |
| 22. |
What is the cause of excurrent habit in Pinus [AIIMS 1987] |
| A. | Presence of gibberellin |
| B. | Presence of apical dominance |
| C. | High concentration of cytokinin |
| D. | High concentration of ABA |
| Answer» C. High concentration of cytokinin | |
| 23. |
2, 4-D is a [MP PMT 1986, 87; CPMT 1996; BHU 2002; Manipal 2005] |
| A. | Insecticide |
| B. | Weedicide |
| C. | Nematicide |
| D. | Rodenticide |
| Answer» C. Nematicide | |
| 24. |
According to F. Went, auxins transmit |
| A. | From apex to downward |
| B. | Opposite to A |
| C. | From centre to periphery |
| D. | Opposite to C |
| Answer» B. Opposite to A | |
| 25. |
Auxins were discovered by [BHU 1988] |
| A. | Thimman |
| B. | Went |
| C. | Butler |
| D. | Skoog |
| Answer» C. Butler | |
| 26. |
Most of the information regarding auxins have been obtained from |
| A. | Rice plant |
| B. | Maize grains |
| C. | Avena coleoptile |
| D. | Wheat ear |
| Answer» D. Wheat ear | |
| 27. |
Which of the following is not naturally occurring plant hormone [CPMT 1980, 84, 99; MP PMT 1996; JIPMER 2001] |
| A. | 2, 4-D |
| B. | \[G{{A}_{2}}\] |
| C. | Gibberellin |
| D. | IAA |
| Answer» B. \[G{{A}_{2}}\] | |
| 28. |
'Morphactins' are |
| A. | Synthetic growth regulators |
| B. | Synthetic auxins |
| C. | Synthetic gibberellins |
| D. | None of the above |
| Answer» B. Synthetic auxins | |
| 29. |
Wound hormone is called |
| A. | Necrohormone |
| B. | Hormone only |
| C. | Auxins |
| D. | Phyllocaline |
| Answer» B. Hormone only | |
| 30. |
Abscisic acid (ABA) is a stress related hormone and it also [MHCET 2000] |
| A. | Aids in fruit development |
| B. | Accelerates fruit ripening |
| C. | Stimulates mitosis |
| D. | Mediated stomatal closure |
| Answer» E. | |
| 31. |
Which hormone is present in the pulp of fruit, seed coat and resting buds |
| A. | IAA |
| B. | BA |
| C. | GA |
| D. | ABA |
| Answer» E. | |
| 32. |
Presence of which of the following in seed is associated with dormancy [DPMT 1982; CBSE PMT 1999; BVP 2002] |
| A. | Starch |
| B. | Abscisic acid |
| C. | Ethylene |
| D. | Gibberellic acid |
| Answer» C. Ethylene | |