anatomy of flowering plants

what is anatomy?

-study of internal structure of organisms

-in plants it is the organisation of tissues and the structures of tissues

what are tissues?

-a group of similar or dissimilar cells that perform essentially the same function and have a common place of origin

what is the classification of tissues on the basis of development

-meristematic: localised regions in a plant in which active divisions occur or where the cells have the potential to become active in response to appropriate stimuli

-permanent: formed as a result of division and differentiation of meristematic tissue

characteristics of meristematic tissues

-thin walled, isodiametric, compactly arranged with hardly any intercellular space

-living cells

-cell walls are made of cellulose

-dense cytoplasm with tiny or no vacuoles

-ability to grow and divide

-proplastids instead of plastids

-present in apices or root and shoot

-respiration rate is very high due to large amounts of mitochondria present

-give rise to permanent tissues

classification of meristems based on origin and development of initiating cells

-primordial meristem (pro meristem): foundation of new organs or their parts. differentiates into primary meristem

-primary meristem: originates from pro meristem. forms fundamental parts of the plant (root and shoot apices and leaf primordia)

-secondary meristem: appears after a certain stage of development=develops from mature tissue that have already undergone differentiation (interfascicular cambium and cork cambium)