Activity of cambium depends upon variation in climate.

Annula ring are not prominent in trees of temperate region.

Annula ring is a combination of spring wood and autumn wood produced in a year.

Differential activity of cambium causes light and dark bands of tissue-early and late wood respectively

Pharynx $$ \to $$ Oesophagus $$ \to $$ Gizzard $$ \to $$ Ileum $$ \to $$ Crop $$ \to $$ Colon $$ \to $$ Rectum

Pharynx $$ \to $$ Oesophagus $$ \to $$ Ileum $$ \to $$ Crop $$ \to $$ Gizzard $$ \to $$ Colon $$ \to $$ Rectum

Pharynx $$ \to $$ Oesophagus $$ \to $$ Crop $$ \to $$ Gizzard $$ \to $$ Ileum $$ \to $$ Colon $$ \to $$ Rectum

Pharynx $$ \to $$ Oesophagus $$ \to $$ Gizzard $$ \to $$ Crop $$ \to $$ Ileum $$ \to $$ Colon $$ \to $$ Rectum

Lysosomes and Vacuoles

Nuclear envelope and Mitochondria

Mitochodria and Lysosomes

Chloroplast and Vacuoles

S $$ \to $$ G₁ $$ \to $$ G₂ $$ \to $$ M

G₁ $$ \to $$ S $$ \to $$ G₂ $$ \to $$ M

M $$ \to $$ G₁ $$ \to $$ G₂ $$ \to $$ S

G₁ $$ \to $$ G₂ $$ \to $$ S $$ \to $$ M