Question

please help me guys and please don't skip it guys please

Answer 1

Answer:

• epidermis
• The main function of cuticle is to protect the plant from desiccation and infection.
• the cell outline is clearly marked, and the nucleus large and spherical or ellipsoidal

Explanation:

Answer 2

Q24.

epidermis

In plants, protective tissues include epidermis and cork.  

Epidermis: Usually present in the outermost layer of the plant body such as leaves, flowers, stems and roots. Epidermis is one cell thick and is covered with cuticle. Cuticle is a waterproof layer of a waxy substance called cutin secreted by epidermal cells.

Q25

.It forms a boundary between the plant and the external environment. The epidermis serves several functions: it protects against water loss, regulates gas exchange, secretes metabolic compounds, and (especially in roots) absorbs water and mineral nutrients.

Q26

1) It is covered by a waxy coating substance called cuticle

2) It consists of two parts : upper epidermis and lower epidermis

3)It protects the internal organs from various pathogens and other substances.

Q27

DO IT YOUR SELF

Q28

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.

Q29

The dermal tissue of plants and hard cuticle covering protect the plant body from invasion of parasites and other harmful agents.  The structure which protects the body of plant against the 'invasion of parasites'  

Q30

Vascular tissue transports water, minerals, and sugars to different parts of the plant. Vascular tissue is made of two specialized conducting tissues: xylem and phloem. Xylem tissue transports water and nutrients from the roots to different parts of the plant, and also plays a role in structural support in the stem

Q31

Xylem is a type of tissue in vascular plants that transports water and some nutrients from the roots to the leaves. Phloem is the other type of transport tissue; it transports sucrose and other nutrients throughout the plant.

Q32

xylem consists 4 elements known as - Vessels, Tracheids, xylem parenchyma, Xylem fibers. ==> in xylem vessels and tracheids are conductive elemnets. ==> Tracheids, vessels, xylem fibers are dead elements.

Q33

do it yourself

Q34

Tracheids are the conducting elements in the xylem of angiosperms. They are also found in ferns and gymnosperms. It comprises a single  cell with pointed ends.

When the secondary cell wall thickens, the tracheids become highly lignified. After lignification, the tracheids become dead. Tracheids also provide mechanical support to the plants. They can also hold water against the force of gravity due to high surface area to volume ratio.

What are Vessels?

Vessels are found only in angiosperms and help in conducting water and minerals in the plants. During secondary cell wall thickening by lignification, dead, tubular cells are produced for conduction of water. These vessels do not contain protoplasm on maturity.

Q35

A simple tissue is composed of only one type of cells while the complex tissue is composed of different types of cells

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