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
selerenchyma 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 libres.
7. What is the specific function of the cardiac muscle?
8. Differentiate between striated, unstrated and cardiac muscles
on the basis of their structure and site/location in the body
Draw a labelled diagram of a neuron.
Answers
Answer:
1)A tissue is an ensemble of similar cells and their extracellular matrix from the same origin that together carry out a specific function. Organs are then formed by the functional grouping together of multiple tissues
2)Xylem tissue is made up of four different types of cells- tracheids, vessels, xylem parenchyma and xylem fibres.
3)The primary difference between simple and complex tissue is, simple tissue is made up of only one type of cell whereas complex tissue is formed of many types of cells. A simple tissue in animals is known as Epithelium whereas in plants it is known as Epidermis.
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)Stomata, the small pores on the surfaces of leaves and stalks, regulate the flow of gases in and out of leaves and thus plants as a whole.