Plant Tissues, Organs And Systems Flashcards Preview

Biology > Plant Tissues, Organs And Systems > Flashcards

Flashcards in Plant Tissues, Organs And Systems Deck (35):
1

Plan organs?

Stems
Roots
Leafs

2

Plant tissues?

Epidermal tissues - cover plant
Mesophyll - carries photosynthesis
Xylem & phloem - transport substances around plant

3

Stem?

Supports leaves and flowers and transports substances around the plant

4

Leaf?

Absorbs light for photosynthesis

5

Roots?

Takes in water and minerals

6

Equation for photosynthesis?

CO2 & water given light energy and chlorophyll = oxygen and glucose

7

Phloem?

Composed of still living cells that transport dissolved foods eg Sugars from leaves to rest of plant (thin walls)

8

Xylem?

Composed of dead cells that transport water and mineral ions through the plan from roots to leaves (thick walls)

9

Vascular bundle?

Phloem, combium and xylem
(Part of a transport system)

10

Combium cells?

Grow into new xylem and phloem

11

Xylem cells?

Form xylem vessels with a one way flow - outer walls thicken - cells die and become lignified- adjoining walls break down to form continuous tube - rings of lignin in walls

12

Phloem cells?

Form phloem tubes - two way flow - living cells - end walls form sieve plates

13

Xylem cells ?

Dead - strong and made of lignin

14

Xylem direction of transport?

Up from roots to leaves

15

Xylem substances transported?

Water & minerals

16

Phloem cells 2?

Living- have sieve plates

17

Phloem direction of transport?

Up and down - from where made to rest of plant

18

Phloem substances transported?

Dissolved foods eg sugars

19

How do stomata open and close?

Controlled by guard cells - light, water taken by osmosis and become turgid due to rigidness of inner walls - pulled apart opening pose -dark, water loss by osmosis and inner walls move together closing pore - photosynthesis increases in stomata and increases sugar concentration gradient which means there is an osmotic gradient

20

Transpiration?

Loss of water vapour due to stomata open to allow CO2 in plant for photosynthesis but water vapour lost from surface of plant

21

Transpiration stream?

Water evaporates from surface of leaf, water from xylem is pulled up through plant to replace it, this constant movement from roots to leaves is it

22

Used to measure transpiration?

Potometer

23

Light intensity?

Increases, light causes stoma to open and wider stoma allows faster transpiration of water vapour out of leaf

24

Wind?

Increases, wind blows water vapour away from stoma, keeping concentration gradient high

25

Temperature?

Increases, higher temp increases kinetic energy of molecules & makes diffusion, osmosis and evaporation occur faster

26

Humidity?

Decreases, humid air has more water vapour - less able to accept more water molecules by evaporation

27

Light energy?

Increases rate of photosynthesis and produces more sugars guard cell becomes turgid and guard cells and stoma are more open to collect CO2 so more water can evaporate out

28

How's a leaf adapted for transpiration?

-thin
-large surface area
-stomata mainly on lower surface -spongy mesophyll cells
-waxy layer waterproof on upper epidermis -prevents water loss
-rounded cells not tightly packed -large SA
-guard cells open & close - control water loss
-arrangement of cells - short diffusion distance

29

Plant organ system?

Roots stems and leads did transport of substance around plant

30

Root hair cells?

Adapted for efficient uptake of water by osmosis and uptake of mineral ions by active transport

31

Translocation?

Movement of food molecules through the phloem

32

Phloem sugar?

Transports dissolved sugars from leaves (made by photosynthesis) to rest of plant for immediate use or storage.

33

Sugars are?

-used in respiration to release energy
-used in meristems - cells divide for growth
-used to make cellulose cell walls
-stored as starch in stems or roots as starch is insoluble
-moved from storage regions to cells where needed

34

Phloem tubes?

Tubes composed of elongated cells and cell sap can more from 1 phloem to the next through pores in the end walls

35

Rate of transpiration?

Result difference / total time