Gases Exchange in Plants

This presentation is about gaseous exchange. Especially about gases exchange in plants. in this presentation we discussed about that how gases exchange occur in different plant and through which organs gases exchange occur in plants.

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2. Exchange of gases in plants Prepared By: Asad Khan B-01 6 th Semester BS Botany 2

3. Presentation contents What is gaseous exchange. Gases exchange in plants Stomata and gases exchange Gas exchange in day and night Gas exchange in aquatic plants Lenticels and Gaseous Exchange References 3

4. What is gaseous exchange The diffusion of gases from an area of higher  concentration to an area of lower  concentration is called gases exchange. Gases exchange is a process in which plants and other organisms exchange different gases with environment The  exchange of oxygen and carbon  dioxide occur   between  an organism and its environment . 4

5. Gases exchange in plants Plants obtain the gases they need through their leaves . They require oxygen for respiration and carbon dioxide for photosynthesis . 5

6. Cont.…………. Plants do not have specialized structures for gas exchange. In small plants such as mosses, leaves and other structures are very thin and gases are able to move in and out via diffusion . In more complex plants oxygen and carbon dioxide is exchanged through the stomata on leaves, stems and roots. 6

7. Stomata and gases exchange The gases diffuse into the intercellular spaces of the leaf through pores. which are normally on the underside of the leaf called  stomata.  From these spaces they will diffuse into the cells that require them. 7

8. Stomata opening and closing The opening and closing of stomata can be in response to water moving in or out of the cell When water moves into the cell, the turgor of the cell increases causing them to lengthen and open the stomata. Opening and closing of the stomata can also be in response to light and low internal carbon dioxide levels . 8

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10. Gas exchange in day and night During the day plants will produce more oxygen via photosynthesis than they consume during respiration. Therefore there is net production of oxygen and net consumption of carbon dioxide . At night however when plants are not perform photosynthesis there will be a net production of carbon dioxide and consumption of oxygen. 10

11. Gas exchange in aquatic plants Water plants will have special adaptations that allow them to exchange gases within their moist environment . Some plants such as lilypads have leaves that float giving them ready access to air. Mangroves have pneumatophores also known as aerial roots that grow above the water’s surface. Submerged aquatic plants are able to exchange gases with water across their epidermis. 11

12. Lenticels and Gaseous Exchange Lenticels are small scar like opening present on the bark of woody plant. Involve in transpiration. Gases exchange also occur through lenticels. 12

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14. references https:// www.s-cool.co.uk/a-level/biology/gas-exchange/revise-it/gas-exchange-in-plants https:// en.wikipedia.org/wiki/Gas_exchange https:// www.slideshare.net/mhnsathish/gas-exchange-72439958 https:// www.slideshare.net/naureenkhaliq5/gas-exchange-in-plants https:// www.slideshare.net/RichardBader/gas-exchange-15135759 14

15. The End 15

16. thanks 16