gaseous exchange, gaseous exchange mcqs mdcat, gaseous exchange definition, gaseous exchange in plants, gaseous exchange in animals.
Gaseous exchange refers to the movement of gases between an organism and its environment, which is a crucial process for all living organisms. In animals, this exchange occurs primarily in specialized respiratory organs such as lungs or gills, where oxygen is absorbed and carbon dioxide is released through diffusion. On the other hand, in plants there is a gaseous exchange through small openings called stomata on leaves and go to nokryan.com if you are interested in learning more about this basic concept of nature.
1. Some of the minerals enter the root hairs or epidermal cells of roots by ?
- Diffusion
- All of thesecorrect
- Active transport
- Facilitated diffusion
2. There is no mass flow system in ?
- Unicellular organisms
- Both a % bcorrect
- Lower multicellular organisms
- Complex multicellular organisms
3. Root pressure is created by the active secretion of salts and other solutes from other cells into the ?
- Xylem sapcorrect
- Phloem sap
- Xylem and phloem sap
- Cell sap
4. Ascent of sap involves ?
- Imbibition
- Root pressure
- All of abovecorrect
- Cohesion tension theory
5. It has been estimated that a positive hydrostatic pressure generated by root pressure is around ?
- 100 to 200 Kpacorrect
- 350 to 450 Kpa
- 300 to 400 Kpa
- 200 to 300 Kpa
6. Symbiotic relationships help plants acquire ?
- Phosphorus
- Light
- Nutrientscorrect
- Nitrogen
7. Most of ions taken up by the roots by the process of ?
- Passive transport
- Active transportcorrect
- diffusion
- facilitated diffusion
8. At incipient plasmolysis the protoplast has just ceased to exert any pressure against the cell wall so the cell is ?
- Burst
- Flaccidcorrect
- Turgid
- Collapsed
9. Root pressure is leaf effective during ?
- Night
- Evening
- Morning
- Daycorrect
10. Uptake of minerals by root cells is ?
- Active
- Both a and bcorrect
- Invasive
- Passive
11. The pressure exerted by a vertical force of one Newton on an area of 1 meter square is called ?
- Kpa
- Both a and bcorrect
- 1000 Pascals
- 100 pascals
12. The dew drops seen on the tips of leaves are actually guttation droplets exuded from ?
- Lenticels
- Hydathodescorrect
- Cuticle
- All of these
13. Plants are able to synthesize all their required compounds with the help of ?
- Minerals and Hydrogen
- Light energy
- All of thesecorrect
- Carbon
14. The membranes of vacuoles are also ?
- Sympast
- All of these
- Apoplast
- Tonoplastcorrect
15. The other name of solute potential is ?
- Osmotic potentialcorrect
- Water potential
- Solvent potential
- Wall potential
16. As a leaf transpires the water potential of its mesophyll cell is ?
- Fairly maintained
- Increased
- Droppedcorrect
- Stopped
17. Closely associated with root pressure is a phenomenon called guttation or ?
- Imbibition
- Transpiration
- Bleeding
- Exudationcorrect
18. Xylem water tension is strong enough to pull water up to ?
- 100 meters
- 300 meters
- 600 meters
- 200 meterscorrect
19. Mycorrhizae are present in 90% families of ?
- Seed plants
- Pteridophytes
- Amphibious plants
- Flowering plantscorrect
20. Guttation is more notable when transpiration is ?
- None of above
- Increased
- Suppressedcorrect
- Stopped
21. Distilled water has ?
- Negative water potential
- Highest water potentialcorrect
- Lowest water potential
- Moderate water potential
22. Active transport is selective and depend upon ?
- Respiration
- Photosynthesis
- Guttation
- Transpirationcorrect
23. The combined length of branch roots of aa rye plant is ?
- 600 kilometerscorrect
- 400 kilometers
- 50 kilometers
- 550 kilometers
24. The casparian strips are present in ?
- Endodermal cells of rootscorrect
- cells of phloem
- Cortex cells of roots
- Cells of pericycle
25. Water molecules move along cell walls of xylem vessels due to imbibition was proposed by ?
- Jolly
- Dixon
- Sackscorrect
- Stocking