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Tissues
hat are three main categories of connective tissue?
Categories of Connective Tissue:
(i) Connective Tissue Proper. In this type of tissue there is a matrix in which generally two types (white and yellow) fibres are present. In between these fibres some other cells are present in the matrix.
(ii) Skeletal Tissue. This type of tissue forms the skeleton of an organism. It may consist of notochord, cartilage and bone.
A cartilage has a matrix, called chondrin, in which a network of collagen fibres is present. There are present cells known as chondrocytes. There may be present empty spaces filled with fluid known as lacunae.
In bones, matrix is formed of a protein called ossein impregnated with phosphate and carbonates of calcium and magnesium.
(iii) Fluid Tissue. Blood and lymph tissues are called fluid tissue. These are specialized connective tissue. It consists of liquid matrix with no fibres. In this liquid matrix-plasma there are corpuscles. Blood transports food material, gases and other substances to the various parts of the body of an animal.
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What would happen to the life of a cell if there was no Golgi apparatus?
Which organelle is known as the powerhouse of the cell? Why?
Where do the lipids and proteins constituting the cell membrane get synthesized?
How does an Amoeba obtain its food?
What is osmosis?
Carry out the following osmosis experiment:
Take four peeled potato halves and hollow each one out to make potato cups. One of these potato cups should be made from a boiled potato. Put each potato cup in a trough containing water. Now,
(a) keep cup A empty
(b) put one teaspoon sugar in cup B
(c) put one teaspoon salt in cup C
(d) put one teaspoon sugar in boiled potato cup D.
Keep this setup for two hours. Then observe the four potato cups and answer the following :
(i) Explain why water gathers in the hollowed portion of B and C?
(ii) Why is potato A necessary for this experiment?
(iii) Explain why water does not gather in the hollowed out portions of A and D.
By which instrument you can see internal structure of onion peel cell?
Do different organisms have different types of basic building units ? Briefly explain.
To what the shape and size of cells are related to?
What constitute the basic building block of the cell?
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