Question

1. Define the term "tissue".
2. How many types of elements together make up the xylem tissue?
Name them.
3. How are simple tissues different from complex tissues in plants?
4. Differentiate between parenchyma, collenchyma and
sclerenchyma on the basis of their cell wall.
5. What are the functions of the stomata?
6. Diagrammatically show the difference between the three types
of muscle fibres.
7. What is the specific function of the cardiac muscle?
8. Differentiate between striated, unstriated and cardiac muscles
on the basis of their structure and site/location in the body.
9. Draw a labelled diagram of a neuron.

Answer 1

Answer:

Explanation:

1. Any of the distinct types of material of which animals or plants are made, consisting of specialized cells and their products.

2. Xylem tissue is made up of four different types of cells- tracheids, vessels, xylem parenchyma and xylem fibres.

3. Simple tissues are made up of only one type of cells, which look like each other. On the other hand, complex tissues are made up of more than one type of cells.

4. Parenchyma has a thin cell wall of their cells, and are made up of cellulose. Whereas collenchyma cells have an uneven cell wall made up of pectin and hemicellulose. There is a hard and thick cell wall present of the sclerenchyma cells, which is made up of the lignin.

5. They are pores surrounded by specialized parenchymatic cells, called guard cells. Stomata have two main functions, namely they allow for gas exchange acting as an entryway for carbon dioxide (CO2) and releasing the Oxygen (O2) that we breath. The other main function is regulating water movement through transpiration.

6. The three types of muscle fibres are striated muscles, smooth muscles (unstriated muscle fibre), and cardiac muscles.

7.Cardiac muscle tissue works to keep your heart pumping through involuntary movements. This is one feature that differentiates it from skeletal muscle tissue, which you can control. It does this through specialized cells called pacemaker cells. These control the contractions of your heart.

8.Striated muscle  

Unstriated muscle

Cardiac muscle

They are cylindrical in shape and multi nucleate.

They spindle shaped and uninucleate.

They are cylindrical branched and uninucleate.

They are present in body parts such as hands and legs.

They are present in the wall of food canal, stomach, mouth, iris etc.

They are present in the heart.

9.