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Tissues
Explain the structure of parenchyma. What are its major types?
Parenchyma. It is the basic or fundamental tissue found in plants. Parenchyma acts as a packing tissue and therefore, it is found in between other tissues. Parenchyma tissue cells store starch, proteins, minerals etc.
i. These are thin walled, circular or polygonal and isodiametric, i.e., having similar sides.
ii. They are living and consists of cytoplasm and a nucleus.
iii. There are many small or a single big central vacuole.
iv. They may not have intercellular space or may have intercellular spaces.
Some parenchymatous cells have pigmented chromoplats. The most important are the cells which contain a number of chloroplasts and the tissue is green, it is known as chlorenchyma.
Some non-green chromoplasts provide different colours to flowers and fruits.
Sometimes the cells contain big air spaces in between them. Such tissue is known as aerenchyma. On the other hand some tissues are green, containing many air spaces then it is called spongy tissue.
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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?
Can you find out more names of some of the unicellular organisms and fungi, other than given in your book?
Name two single celled animals.
Draw diagram of onion peel as it is seen through microscope.
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