Question

short notes.
a). Xylem.
b). meristematic tissue.
c). striated muscles.
d). sericulture ​

Answer 1

Xylem : It is a vascular tissue which help in the conducting water from roots to water

Meristematic tissues : These tissue are responsible for the growth of plant

Meristematic tissie consists of

Apical meristem

Intercalary meristem

Lateral meristem

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Answer 2

*xylem

Xylem is a complex permanent tissue that conducts water and mineral upward from to plant it is also known as wood.

xylem consists of four types of elements.

VESSELS - vessel is a cylindrical tube like structure that are placed one above the other end to end. it is a non living cell with lignified walls.

TRACHIEDS are long tubular dead cells with lumen and tapering ends.the cell wall is thick with lignin.

XYLEM FIBERS are long non living cells with very thick lignin deposition on walls.they have narrow lumen.

XYLEM PARENCHYMA are living cells with cellulosic cell wall. they help in storage of starch .

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b)meristematic tissue

Meristematic tissues:

Consist of actively-dividing cells. Meristematic tissue are of three type:-

-Apical meristem: present at the growing tips of stems and roots.

(Function: to increase the length of stems and roots.)

-Intercalary meristem: present at the base of leaves or internodes.

(Function:for the longitudinal growth of plants.)

-Lateral meristem: present on the lateral sides of the stems and roots.

(Function:to increase the thickness of stems and root

*striated muscles

short note on stratited muscle are as follows :-

1) Muscle tissue in which the contractile fibril in the cells are aligned in parallel bundles.

2) So that their different region of strips form stripes in a visible microscope.

3) Muscles of this type attached to the skeletal by tendons

4) They are voluntary control.

5) They are also called skeletal muscle

*sericulture

It is the art and science of silkworm breeding for producing silks. The sericulture is an important cottage industry, but is now the basis of large industries in China, Japan, India and some European countries, where the silkworm, Bombyx mori is reared on mulberry leaves on a mass scale to get raw silk from the cocoons of the caterpillars of the moth.

The eggs of the silkworm moth hatch out within 10 days into creamy white rapidly moving caterpillars. The latter feed voraciously on the fresh mulberry leaves and soon undergo a fast growth and are popularly referred to as silkworms.

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