NCERT Class-9 Science Solutions: Chapter 6 – Tissues Part 8

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Question 46:

Fill in the blanks

  1. Cork cells possesses———on their walls that makes it impervious to gases and water.

  2. ——— have tubular cells with perforated walls and are living in nature.

  3. Bone possesses a hard matrix composed of———and ———.

Answer:

  1. Cork cells possesses suberin on their walls that makes it impervious to gases and water.

  2. Sieve tubes have tubular cells with perforated walls and are living in nature.

  3. Bone possesses a hard matrix composed of calcium and phosphorus.

Question 47:

Why is epidermis important for the plants?

Answer:

Epidermis is important for the plants because it covers the outermost part of the plant and protect from harmful bacteria’s for plants by resists its entry

Image Epidermis

Image Epidermis

Image Epidermis

  1. It gives protection

  2. Helps in gaseous exchange

  3. Checks water loss

  4. Root hairs arising from epidermis helps in absorption of water and minerals.

Question 48:

Fill in the blanks

  1. ———are forms of complex tissue.

  2. ———have guard cells.

  3. Cells of cork contain a chemical called———

  4. Husk of coconut is made of ———tissue.

  5. ———gives flexibility in plants.

  6. ———and———are both conducting tissues.

  7. Xylem transports———and———from soil.

  8. Phloem transport———from———to other parts of the plant.

Answer:

  1. Xylem and phloem are forms of complex tissue.

  2. Stomata have guard cells.

  3. Cells of cork contain a chemical called suberin

  4. Husk of coconut is made of sclerenchyma tissue.

  5. Collenchyma gives flexibility in plants.

  6. Xylem and phloem are both conducting tissues.

  7. Xylem transports water and minerals from soil.

  8. Phloem transport food from leaf to other parts of the plant.

Long Answer Questions

Question 49:

Differentiate between sclerenchyma and parenchyma tissues. Draw well labelled diagram.

Answer:

Differentiate between Sclerenchyma and Parenchyma
Differentiate between sclerenchyma and parenchyma

Parenchyma

Sclerenchyma

1.

Cells are thin walled and unspecialised

1.

Cells are thick walled and lignified

2.

These are living cells

2.

Tissues are made up of dead cells

3.

Cells are usually loosely packed with large intercellular space

3.

No intercellular spaces between the cells are found

4.

Stores nutrient and water in stem and roots

4.

Provides strength to the plant parts

5.

Some cells contain chlorophyll called chlorenchyma and perform photosynthesis. Other cells have large air cavities called aerenchyma which

provide buoyancy to the hydrophytes plants

5.

The cells are long and narrow, make the plant hard and stiff. The tissue is present in the stem around vascular bundles, in veines of leaves and hard covering of seeds and nuts.

6.

Image T.S.andL,S Parenchyma, T.S.and L.S. Sclerenchyma

Image T.S.andL,S Parenchyma, T.S.and L.S. Sclerenchyma

Image T.S.andL,S Parenchyma, T.S.and L.S. Sclerenchyma

6.

sclerenchyma tissues

Differentiate between Sclerenchyma and Parenchyma

sclerenchyma tissues