Question

difference b/w simple and complex tissues ? and another ans guven in pic​

Answer 1

Answer:

b

Explanation:

IF the tissues are composed of cells which are functionally and structurally similar, then they are called SIMPLE TISSUES. IF the tissues are composed of more than one type of cell, and they work together as a unit, performing many functions, then they are called COMPLEX TISSUES.

Answer 2

1. Define the term "tissue". How are simple tissue different from complex tissue?

Answer:

Tissue:

A tissue is a group of similar cells forming a specific function, or in other words, we can say a group of cells which are similar in structure and function.

Difference between simple and complex tissues:

Simple permanent tissue:

• It is composed of cells that are structurally and functionally similar.

• This tissue provides support and protection to plants.

• It is located in every part of plant.

• It is further classified into two types protective tissue and supporting tissue.

Complex permanent tissue:

• It is made up of two or more types of cells that are specialised to perform a common function.

• The main function of this tissue is to transport water and food materials.

• Primarily, it is located in vascular regions.

• It is further classified into two types of xylem and phloem.

2. Diagrammatically show the difference between three types of muscle fibres.

Answer:

Refer the attachment!!

➛ A -

• Striated muscles that are under the control of our will.
• They are cylindrical, unbranched, nucleated and striated.

➛ B -

• Unstriated muscles that are not under our control of our will.
• They are spindle shaped, unbranched and uninucleated.

➛ C -

• Cardiac muscles which are involuntary in function and found in the walls of heart.
• They are striated, uninucleated and branched.

4. What are stomata? Write the functions of stomata?

Answer:

Stomata are a small openings on the leaves present mostly on the lower surface of leaves and on green stems.

Functions of stomata:

• They help in the exchange of gases ( Carbon dioxide and oxygen ).

• They help in transpiration that is evaporation of water from the surface of leaves.

• Stomata remains closed at night. This closure prevents the water from escaping through open pores.

• They contain chloroplasts, which consists of chlorophyll and thus help in photosynthesis.

5. Draw labelled diagram of a neuron.

Answer:

Refer the attachment ( 3 ).

6. Write the constituents of xylem and phloem.

Answer:

Xylem: It conducts water upwards from the roots to the shoot system.

Constituents:

1. Xylem vessels
2. Tracheids
3. Fibres
4. Xylem parenchyma

Phloem: It transfers food material from the leaves to other parts of the plant.

Constituents:

• Sieve tubes
• Companion
• Phloem Fibres
• Phloem parenchyma

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