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Flashcards in Plant structure Deck (15)
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1

Protoplast

Living portion of the cell inside the cell wall and has four parts:
1) Plasma membrane
2)cytoplasm
3) vacuoles
4) Nucleus

2

Plasmodesmata

tubular extension of plasma membrane that connects adjacent cells.

3

cytoplasm

-enclosed by the plasma membrane
-composed of 75-90% water
-physiological activity occurs here

4

organelles in the cytoplasm

-ribosomes: site of protein synthesis
-endoplasmic reticulum: long, membranous network and through plasmodesmata

5

Plastids

double membrane- bound organells unique to plants

6

Leucoplasts

colorless, storage bodies

7

Chromoplasts

colored

8

chloroplasts

where photosynthesis occurs

9

Mitochondria

-cells energy center
-where respiration occurs

10

Vacuoles

-membrane lines cavities within the cytoplasm
-filled with cell sap

11

Nucleus

-control center of cell
-contains DNA

12

Cell wall

-protects the protoplast
-provides external structure
-provides support for plant
-non living
-has layers (primary, gluey pectin, secondary)

13

Primary cell wall

-formed during early stages of growth
-composed of cellulose, hemicellulose, and pectin
- thin, water-permeable and elastic

14

Secondary cell wall

-the fibrous and woody tissues
-formed inside primary wall
-contains ligin, making walls rigid
-provides mechanical support

15

Middle lamella

-outermost layer of mature cell wall
-contains pectin which cements together primary wall to adjacent cells