Which of the statements given below is not true about formation of Annual Rings in trees?
Differential activity of cambium causes light and dark bands of tissue early and late wood respectively.
Activity of cambium depends upon variation in climate.
Annual rings are not prominent in trees of temperate region.
Annual ring is a combination of spring wood and autumn wood produced in a year
Pick out the correct statement
Spring wood is otherwise called late wood
Autumn wood is otherwise called early wood
In old trees, the heart wood is involved in the conduction of water
In old trees, the sap wood does not conduct water
In old trees, the sap wood does not conduct water
Xylem translocates
Water and mineral salts only
Water, mineral salts and some organic nitrogen only
Water, mineral salts, some organic nitrogen and hormones
Water only
Which among these statements about collenchymas is true?
Collenchyma cells are usually dead without protoplasts
The cells are long and narrow with thick lignified walls
Collenchyma occurs in layers below the epidermis in dicotyledonous plants
These cells are found in the pulp of fruits like guava, pear and sapota
These cells are found in the pulp of fruits like guava, pear and sapota
