Question

How many tissue systems are suggested by Sachs?
A) Two
B) Three
C) Four
D) Five

Answer 1

Hint: Julius von Sachs was a German botanist whose experimental study of nutrition, tropism, and transpiration of water in plants helped in the advancement of knowledge in plant physiology

Complete answer:
Coherent masses of cells which perform similar functions are called tissues and collective functioning of two or more tissues together, irrespective of their location are known as tissue systems. In plants there are three basic tissue systems as explained by the botanist Sachs. These are:
Epidermal or Dermal Tissue system
(i) Epidermis protects the inner tissues.
(ii) Stomata helps in transpiration.
(iii) Root hairs help in the absorption of water and minerals.
Cortical or Fundamental or Ground Tissue system
(i) Photosynthesis
(ii) Food storage
(iii) Healing
(iv) Tissue regeneration
(v) Supporting young stems, roots, and petioles
(vi) Providing rigid support
Vascular Tissue system
(i) Transport of water and minerals
(ii) Transport of food/nutrients

Therefore option (B) Three is the correct answer.

Note: : The tissue types in the three plant tissue systems are traditionally categorized as-
(i) Dermal Tissue system - Epidermis and periderm
(ii) Ground Tissue system - Parenchyma, collenchyma and sclerenchyma
(iii) Vascular Tissue system - xylem and phloem