Digestion and Absorption — BIOLOGY STD 11 Science — Question

Given below are floral formulae of some well-known plants. Identify and write to which plants these belong.

Differentiate between pili and fimbriae of bacteria.

Give the name along with the function of each of the three major kinds of cells of the gastric glands.

Mention the importance of chemical analysis of liver in postmortem.

Give a description of metaphase I of meiosis.

What names were given to the PGRs that were discovered as inhibitors independently by three scientists? What are they all referred to as now?

Rani was amazed to read about the layers and coverings in the plant. As her teacher taught her that like mammals, plants are also formed by various layers of tissues. Thus, forming the different plant system. As the epidermal tissue system forms the outermost covering of the body. She felt curious and asked her elder sister about the same, that how come this is possible. Her sister cleared all her doubts patiently.

1. From where it is derived?
2. Why are outer wall of some plants is cutinised?
3. In some cases, the cuticle is reinforced by a layer of wax. Explain the reason.
4. Extract the message from Rani's behavior.

What are guard cells? Describe their structure Mention their function.

Water is not a nutrient but is very important for digestion. If a person does not drink enough water, it can lead to which of these problems? Explain the possible problems which can arise because of the situation as per your answer.

1. There will be less secretion of digestive enzymes.
2. The person may suffer from poor bowel movement; leading to constipation.

Earthworms are:

1. Useful.
2. Harmful.
3. More useful than harmful.
4. More harmful.