A protective layer of soil
stone
grass
plants
air
A plant tissue
Stem
Roots
Leaves
Xylem
About _________% of total rainfall is runoff.
10
90
50
30
An extensive area of land covered with trees and other plants
land
water
atmosphere
forest
The _________structure of the roots of all plants remains almost the same with little difference.
External
Internal
Common
Backward
Pine tree has
Lateral roots
Tap roots
Fibrous roots
Thick roots
Forests, deserts, wetlands, mountains are important ________ on the earth.
resources
habitats
places
A major root that penetrates deep into the soil.
Root hairs
