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class 9th phloem tissues
- 1. LIFE SCIENCE CLASS – 9 Topic - PHOLEM Bittu Kumar Integrated B.Sc. - B.Ed. School of Education, LPU
- 9. LOCATION AND NATURE Phloos = Bark Conduction – bidirectional Growing parts Storage organs No mechanical function for plants
- 10. Phloem tissue is present in A. Wood B. Bark C. Both A and B D. None of the above
- 12. Elements of Phloem Sieve tubes Companion cells Phloem parenchyma Phloem fibres
- 14. Sieve Tube Conducting element of the phloem. Formed from a vertical series of elongated cells, interconnected by perforations in their walls in areas known as sieve plates. The perforations may be restricted to smaller areas, sieve fields, several of which are contained in each sieve plate.
- 15. Companion cell Specialized parenchyma cells in the phloem tissues of the angiosperms. They are nucleated living cells with several ribosomes, plastids, and mitochondria. Their nuclei are relatively large (an indication of being metabolically active)
- 16. Phloem Parenchyma Phloem parenchyma cells, called transfer cells and border parenchyma cells. located near the finest branches and terminations of sieve tubes in leaf veinlets. Function in the transport of foods.
- 17. Phloem Fibres • Provide mechanical strength and support to a plant in general and to phloem in particular. • These fibers are abundantly formed in the long but narrow stems of many fiber-crops.
- 18. Which of the following element is Non living? • Sieve Tubes • Companion Cells • Phloem Parenchyma • Phloem Fibers
Editor's Notes
- WELCOME BACK to my channel if you new to channel please do subscribe the channel and hit the bell icon to get early notifications about upcoming videos. So lets start with identifying some structures from previous concept then we will move to our today's topic
- As we have learnt about the xylem elements in our previous video these are the elements of xylem
- We know that xylem elements are present in vascular bundles and ther is another component of vascular bundle is phloem so today we are going to study about phloem
- So for today our topic is phloem
- See here we are aware about this picture this is a carrot we all know that it is full of nutrition's lets see from where it comes to carrot which is root of plant.
- This chart showing the different phases of carrot plant see there are some phases root is swollen and in last stage there is floweing along with flat root it is showing that nutrition stored while young phase is now getting utilised for reproduction .
- We can do an activity to find the location of vascular bundle in case of dicot plant s we can remove a section strip of outer covering as shown in figure then after few days we will observe that upper part ends are swollen due to transportation od food prepared from leaves are transported towards root .
- We know that xylem is dead tissue and can conduct water only in upstream by capillary action but in case of phloem there is bidirectional transport.
- We discussed the location of phloem it is present in bark , the word phloem is derived from greak word phloos which means bark,and it conducts sap in bidirection from growing reason to storage organs and vice versa, It does not provide any mechanical function for plants,
- Now here we arwe having an question saying If you got the correct answer comment belowin comment section
- This is a cross section of phloem tissue showing different elements of phloem tissues except phloem fiber
- Lets enlist all the elements of phloem
- This is the diagram of phloem tissue which we are going to label
- The sieve tube is the conducting element of the phloem. It is formed from a vertical series of elongated cells, interconnected by perforations in their walls in areas known as sieve plates. The perforations may be restricted to smaller areas, sieve fields, several of which are contained in each sieve plate.
- The companion cells are specialized parenchyma cells in the phloem tissues of the angiosperms. They are nucleated living cells with several ribosomes, plastids, and mitochondria. Their nuclei and nucleoli are relatively large (an indication of being metabolically active)
- Phloem parenchyma cells, called transfer cells and border parenchyma cells, are located near the finest branches and terminations of sieve tubes in leaf veinlets, where they also function in the transport of foods
- Phloem fibers are important elements of plant architecture by providing mechanical strength and support to a plant in general and to phloem in particular. These fibers are abundantly formed in the long but narrow stems of many fiber-crops.