MCQOPTIONS
Saved Bookmarks
MCQOPTIONS
This section includes 24 Mcqs, each offering curated multiple-choice questions to sharpen your Life Sciences knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
Statement A: Transpiration creates pressure in xylem sufficient enough to transport water up to 130 m high. Statement B: Transpiration creates a pushing force. |
| A. | Both the statements are true |
| B. | Both the statements are false |
| C. | Statement A is true but Statement B is false |
| D. | Statement B is true but Statement A is false |
| Answer» D. Statement B is true but Statement A is false | |
| 2. |
Statement A: Inner wall is pushed outwards Statement B: Outer wall is pulled outwards |
| A. | Both the statements are true |
| B. | Both the statements are false |
| C. | Statement A is true but Statement B is false |
| D. | Statement B is true but Statement A is false |
| Answer» E. | |
| 3. |
The small diameter of the tracheary elements increases ___________ |
| A. | adhesion |
| B. | cohesion |
| C. | tensile strength |
| D. | capillarity |
| Answer» E. | |
| 4. |
Transpirative loss is studied through girdling experiment. |
| A. | True |
| B. | False |
| Answer» C. | |
| 5. |
Which among the following is an internal factor affecting transpiration? |
| A. | Temperature |
| B. | Humidity |
| C. | % open stomata |
| D. | Wind speed |
| Answer» D. Wind speed | |
| 6. |
Which among the following is an external factor affecting transpiration? |
| A. | Light |
| B. | Number of stomata |
| C. | Canopy structure |
| D. | Water status of plant |
| Answer» B. Number of stomata | |
| 7. |
In the figure given below, guard cells are shown by? |
| A. | By region of color |
| B. | By region of color |
| C. | By region of color |
| D. | By region of color |
| Answer» C. By region of color | |
| 8. |
Statement A: C3 plants are twice efficient as C4 plants in terms of fixing carbon dioxide. Statement B: C4 plant loses twice the amount of water as C3 plant for same amount of CO2 fixed. |
| A. | Both the statements are true |
| B. | Both the statements are false |
| C. | Statement A is true but Statement B is false |
| D. | Statement B is true but Statement A is false |
| Answer» C. Statement A is true but Statement B is false | |
| 9. |
Which of the following is not a function of stomata? |
| A. | Regulation of turgidity of guard cells |
| B. | Loss of water vapor |
| C. | Loss due to guttation |
| D. | Exchange of O2 and CO2 |
| Answer» D. Exchange of O2 and CO2 | |
| 10. |
Isobilateral leaf has equal number of stomata on both surfaces of the leaf. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 11. |
Which of the following statement is INCORRECT for transpiration? |
| A. | It occurs by stomata, lenticels, and cuticle |
| B. | Water comes out as water vapour |
| C. | It occurs in all plants |
| D. | Root pressure is involved |
| Answer» E. | |
| 12. |
Name the specialized pores from where guttation takes place. |
| A. | Stomata |
| B. | Hydathodes |
| C. | Guard cell |
| D. | Lenticels |
| Answer» C. Guard cell | |
| 13. |
What is guttation? |
| A. | Exudation of xylem sap |
| B. | Root pressure |
| C. | Radial movement |
| D. | Field capacity |
| Answer» B. Root pressure | |
| 14. |
WHAT_IS_GUTTATION??$ |
| A. | Exudation of xylem sap |
| B. | Root pressure |
| C. | Radial movement |
| D. | Field capacity |
| Answer» B. Root pressure | |
| 15. |
Which of the following statement is INCORRECT for transpiration?$ |
| A. | It occurs by stomata, lenticels, and cuticle |
| B. | Water comes out as water vapour |
| C. | It occurs in all plants |
| D. | Root pressure is involved |
| Answer» E. | |
| 16. |
Name_the_specialized_pores_from_where_guttation_takes_place.$ |
| A. | Stomata |
| B. | Hydathodes |
| C. | Guard cell |
| D. | Lenticels |
| Answer» C. Guard cell | |
| 17. |
Which light modulates osmoregulation of guard cell? |
| A. | Green |
| B. | Orange |
| C. | Red |
| D. | Blue |
| Answer» E. | |
| 18. |
Mark the one, which is NOT the characteristics of the guard cell? |
| A. | Thickened inner wall |
| B. | Connected end to end |
| C. | Does not have chloroplast |
| D. | Radial micellation |
| Answer» D. Radial micellation | |
| 19. |
How much percentage of total transpiration is done by stomata? |
| A. | 5-10 |
| B. | 90 |
| C. | 1-5 |
| D. | 60 |
| Answer» C. 1-5 | |
| 20. |
Stomata acts as turgor-operated valves? |
| A. | True |
| B. | False |
| Answer» B. False | |
| 21. |
What are lenticels? |
| A. | Epidermal structure |
| B. | A wax layer of leaves |
| C. | Opening in the bark |
| D. | Channel to transfer water |
| Answer» D. Channel to transfer water | |
| 22. |
Which of the following statement is NOT true regarding the cuticles of the plant? |
| A. | Wax like covering of leaves |
| B. | Cutin is the principal substance |
| C. | Polymer of long chain fatty acids |
| D. | It is mainly composed of the only cutin |
| Answer» E. | |
| 23. |
Mark the one, which is NOT the form of transpiration? |
| A. | Radical transpiration |
| B. | Cuticular transpiration |
| C. | Lenticular transpiration |
| D. | Stomatal transpiration |
| Answer» B. Cuticular transpiration | |
| 24. |
Loss of water from plants in the form of water vapour is called___________ |
| A. | Surface tension |
| B. | Cohesion |
| C. | Ascent of sap |
| D. | Transpiration |
| Answer» E. | |