parts of a leaf

Question 1

define apex

Answer 1

tip of leaf
helps water to run off

Question 2

define margin

Answer 2

edge of leaf

Question 3

define lamina

Answer 3

broad thin flat green surface of a leaf
easy diffusion in and out of leaf
more CO2 coming in because so thin
widest part of leaf

Question 4

define lateral vein

Answer 4

contain vascular bundles
bring water to leaf and take food away from leaf
supports leaf

Question 5

define midrib

Answer 5

contain vascular bundles
bring water to leaf and take food away from leaf
supports leaf

Question 6

define petiole

Answer 6

leaf stalk
attached leaf to plant hold leaf in suitable position to receive sunlight

Question 7

what are leaves

Answer 7

the main site for photosynthesis the process by which plants synthesise food

Question 8

why are most leaves green

Answer 8

due to presence of chlorophyll but may be different colours caused by other plant pigments that mask green chlorophyll

Question 9

how does each variation of a plant help

Answer 9

maximises its chances of survival in a particular habitat

Question 10

define sessile leaves

Answer 10

directly attached to plant stem

Question 11

stipules

Answer 11

small green appendages usually found at base of the petiole

Question 12

venation pattern

Answer 12

arrangement of veins in a leaf

Question 13

difference between monocots and dicots

Answer 13

difference in their patterns of venation
mono have parallel venation where veins run in straight lines across length of leaf without converging at a point
dicots the veins of a leaf have net like appearance forming pattern known as reticulate venation

Question 14

define phyllotaxy

Answer 14

arrangement of leaves on stem

Question 15

what are leaves classified as

Answer 15

alternate spiral or opposite whorled

Question 16

alternate

Answer 16

plants that have only one leaf per node
leaves alternate on each side of stem in a flat plane

Question 17

spiral

Answer 17

leaves are arrayed in spiral along stem

Question 18

opposite

Answer 18

two leaves arise at same point with the leaves connecting opposite each other along branch

Question 19

whorled

Answer 19

if three or more leaves connected at a node

Question 20

simple leaf definition

Answer 20

blade is either completely undivided as in banana leaf or has lobes but the separation does not reach midrib as in the maple leaf
lamina is continuous

Question 21

compound leaf definition

Answer 21

leaf blade is completely divided forming leaflets as in the locust tree
each leaflet may have its own stalk but is attached to the rachis
lamina separated into leaflets
can be either palmately or pinnately

Question 22

palmately compound leaf definition

Answer 22

resembles palm of hand with leaflets radiating out outwards from one point example poison ivy

Question 23

pinnately compound leaves definition

Answer 23

take their name from their feather like appearance the leaflets are arranged along the midrib as in rose leaves or pecan