2. Differentiate between cells of :
(a) Parenchyma and collenchyma
(b) Meristematic tissue and permanent tissue
(c) Sclerenchyma and parenchyma
(d) Cells of involuntary and voluntary muscle
(e) Fibres of voluntary muscle and cardiac muscl
. STRUCTURED/APPLICATION QUESTIONS
1. Study the diagram given below and then answer th
questions that follow :
Answers
Parenchyma:
(1) Cells are thin walled and unspecialised. (2) These are living cells. (3) Cells are usually loosely packed with large intercellular space. (4) Stores nutrients and water in stem and roots. (5) Some cells contain chlorophyll, called as chlorenchyma and perform photosynthesis. Other cells have large air cavities, called as aerenchyma, which provide buoyancy to the hydrophytic plants.
Sclerenchyma:
(1) Cells are thick walled and lignified. (2) Tissues are made up of dead cells. (3) No intercellular spaces between the cells are found. (4) Provides strength to the plant parts. (5) The cells are long and narrow, make the plant hard and stiff. The tissue is present in the stem around vascular bundles, in veins of leaves and hard covering of seeds and nuts.
So, the correct answer is 'Parenchyma- Cells are thin walled and unspecialised, Sclerenchyma- Cells are thick walled and lignified'