The epidermis of the leaf was observed under the microscope by a student during a lab activity. He saw small pores (A) present in it enclosed by special cells (B). While discussion, teacher told the students that epidermis is covered by a chemical substance having waterproof quality.
a) Identify A and B.
b) Mention the function of the small pores observed by the student.
c) Name the chemical substance that covers the epidermis and why it is important for the plants?
Answers
Answer:
Objective
This topic gives an overview of;
Tissues
Meristematic Tissue
Permanent Tissue
Simple Permanent Tissue
Complex Permanent Tissue
Nervous Tissue
Tissues
From the last chapter, we recall that all living organisms are made of cells. In unicellular organisms, a single cell performs all basic functions. For example, in Amoeba, a single cell carries out movement, intake of food and respiratory gases, respiration and excretion. But in multi-cellular organisms there are millions of cells. Most of these cells are specialised to carry out a few functions. Each specialised function is taken up by a different group of cells. Since these cells carry out only a particular function, they do it very efficiently. In human beings, muscle cells contract and relax to cause movement, nerve cells carry messages, blood flows to transport oxygen, food, hormones and waste material and so on. In plants, vascular tissues conduct food and water from one part of the plant to other parts. So, multi-cellular organisms show division of labour. Cells specialising in one function are often grouped together in the body. This means that a particular function is carried out by a cluster of cells at a definite place in the body. This cluster of cells, called a tissue, is arranged and designed so as to give the highest possible efficiency of function. Blood, phloem and muscle are all examples of tissues.
A group of cells that are similar in structure and/or work together to achieve a particular function forms a tissue.
Plant Tissues
Answer:
a) The small pores are know to be stomatal pore and is enclosed by guard cell
b) The function of stomatal pore is for gaseous exchange like H2O , CO2
c) Cuticle is the chemical substance that cover tge epidermis to protect for external environment
Explanation:
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