Question

Which of the following statements is not true for stomatal apparatus?

A. Inner walls of guard cells are thick

B. Guard cells invariably possess chloroplasts and mitochondria

C. Guard cells are always surrounded by subsidiary cells

D. Stomata are involved in gaseous exchange

Answer : Guard cells are always surrounded by subsidiary cells

Releted Question 1

Regeneration of damaged growing grass following grazing is largely due to:

A. Secondary meristem

B. Lateral meristem

C. Apical meristem

D. Intercalary meristem

Releted Question 2

A. Water only

B. Water and mineral salts only

C. Water, mineral salts and some organic nitrogen only

D. Water, mineral salts, some organic nitrogen and hormones

Releted Question 3

A. Elongation

B. root cap

C. Meristematic activity

D. Maturation

Releted Question 4

A. Collenchyma

B. Phellem

C. Phloem

D. Xylem parenchyma