NCERT Class 9 Science Solutions: Chapter 6 – Tissues Part 1

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Question 1

Q. Define the term ‘tissue’?

Answer:

The group of cells similar in structure that work together to achieve a particular function forms a tissue. This group of cells has a common origin.

Question 2

Q. How many types of elements together make up the xylem tissue? Name them.

Answer:

Xylem is a complex tissue. It is made up of following four kinds of cells or elements:

(a) Tracheids

(b) Vessels

(c) Xylem parenchyma

(d) Xylem fibres

Q 2 Image showing Xylem structure.

Q 2 Image Showing Xylem Structure.

Q 2 Image showing Xylem structure.

Question 3

Q. How are simple tissues different from complex tissues in plants?

Answer:

Simple tissues are made up of one type of cells which coordinate to perform a common function.

Complex tissues are made up of more than one type of cells. All these coordinate to perform a common function.

Q 4 Simple Tissue And Complex Tissue.

Q 4 Simple Tissue and Complex Tissue.

Q 4 Simple Tissue And Complex Tissue.

Question 4

Q. Differentiate between parenchyma, collenchyma and sclerenchyma on the basis of their cell wall.

Answer:

The differences between cell walls of parenchyma, collenchyma and sclerenchyma are given in the following table:

Parenchyma vs Collenchyma vs Sclerenchyma
Differnce between Parenchyma, Collenchyma and Sclerenchyma

Parenchyma

Collenchyma

Sclerenchyma

1. Cell wall is primary

1. Cell wall is primary.

1. Cell wall is secondary.

2. Cells have thin walls and made up of cellulose.

2. Cell walls are thickened at the corners due to protein deposition.

2. Cell wall is very thick due to lignin deposition.

Question 5

Q. What are the functions of Stomata?

Answer:

The small pores present in the epidermis of the leaf are stomata. Stomata are enclosed by two kidney shaped cells called guard cells.

Functions of Stomata

  • Exchange of gases, particularly CO2 and O2, with atmosphere.

  • Loss of water in the form of vapour during transpiration.