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ID: 189072 • Letter: P
Question
Paragraph Styles : 1 : 2 : 3 : 4 i 5·61 7 : 8 i 9-10:11:12:13:14:15; 16:171819202122232425:26:27:28 29:30:31 32:33 34:35:36:37393940 411424344 45 46 198 1. Describe in detail the three tissue systems/cell types in plants. Use illustrations to help explain your answers.. 2. Describe in detail the composition of cell walls. Your answer should include a description of the different components that make up the cell wall (including the secondary cell wall). Use an illustration to help explain your answerExplanation / Answer
There are many types of categorisation of plants tissue. Here we are discussing some major and most correct types.
First categorisation says that plants tissues are of three type:
Other classification divides the plant tissues into major two categories:
Plant tissues can also be divided differently into two types:
They are further divided into simple permanent tissues, complex permanent tissues, special or secretory tissues (glandular).
Under simple tissue there is categorisation like
Under complex tissue comes: Phloem and xylem
While some tissue which conc=vert minerals into matrices to provide protection sheath to plants cells against external agents for defense are called mineralised tissues.
Ans 2. Plant cell wall is made up in such a way that it gets the to withstand internal osmotic pressures.Its thickness varies from 0.1 to several µm. Its main composition are:
Carbohydrate: Cellulose, hemicellulose and pectin are the main carbohydrate components in gthe cell wall. The meshwork of cellulose and hemicellulose is embedded in the matrix od pectin. This structure makes them stronger. Other than the carbohydrate are the proteins that are found in the cell wall. hydroxyproline-rich glycoproteins (HRGP), arabinogalactan proteins (AGP), glycine-rich proteins (GRPs), and proline-rich proteins (PRPs) are the main protein present in cell wall.
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