How does the bark act as a protective tissue class 9?

How does the cork act as a protective tissue for Class 9?

The cork cells are dead and compactly packed with no intercellular space. Their cell walls are coated with a waxy substance, suberin, which do not allow water and gases to pass through. Therefore, it protects the plant against mechanical injury and also prevents the loss of water by evaporation.

What is the value of bark as a protective tissue?

Bark provides many functions for trees. Bark plays an essential role in transporting photosynthetic products in plant tissues. Bark is also crucial to the mechanics of the stem. Furthermore, bark is involved in defense against herbivory, protects against fire, and provides insulation in cold conditions.

What is protective tissue in plants Class 9?

Hint: Protective tissues are generally present in the outermost layer of the plant body such as leaves, stem, and roots, and offer safety to the plant body. They stop desiccation, mechanical injury, and infection in plants. Complete answer: The protective tissues in plants consist of epidermis and cork (phellem). >

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How the bark of a tree is formed Class 9?

Answer : A strip of secondary meristem replaces the epidermis of the stem. Cells on the outside are cut off from this layer. This forms the several-layer thick cork or the bark of the tree.

Why cork is called protective tissue?

Cork act as a protective tissue because (i) Its cells are dead and compactly arranged without intercellular spaces. (ii) They also have deposition of suberin on the walls that makes them impervious to gases and water.

What’s the function of bark?

The outer bark is the tree’s protection from the outside world. Continually renewed from within, it helps keep out moisture in the rain, and prevents the tree from losing moisture when the air is dry. It insulates against cold and heat and wards off insect enemies.

What is the role of the bark?

Bark is analogous to an animal’s skin. Its purposes are conserving water and protecting the tree’s essential living systems from temperature extremes and storms as well as from attacks by diseases, animals and insects. Some tree species have extra-thick bark that protects the tree from brush fires.

What is bark give its importance Why are certain bark used in medicines?

Bark is the outermost layer of the stem and roots of a woody plant. It protects the plant from losing water. It prevents infections by fungus and bacteria. Certain barks has the properties to work against parasites.

What is known as protective tissue?

Epidermis is the first layer of the body of both plants and animals that acts as the first line of defense against various types of harmful objects. It protects the other parts of the body from injuries, bacterial attacks etc. For this reason, epidermis is known as protective tissue.

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What is the main function of protective tissue in plants?

The protective tissue is those tissue, which is present in the outermost layer of the plant such as roots, stem, and leaves. Protective tissue prevents desiccation, mechanical injury, and infection in plants. They form a protective barrier which does not allow the entry of the pathogen into the plant.

What is a tissue class 9?

Tissue is a feature of multicellular organisms. Complete Answer: … A group of cells having similar shape and function act together to perform a specific function is known as a tissue. All the body parts are made up of tissues including the organs. Groups of tissues make organs.