Neural Control and Coordination — BIOLOGY STD 11 Science — Question

Give a detail account on neural tissue.

Explain ETS.

Describe phylum Coelenterata. Give suitable examples.

Illustrate the differences between the mechanism of action of a protein and a steroid hormone.

Is there a species specific or region specific type of plastids? Flow does one distinguish one from the other?

Write a note on economic importance of algae and gymnosperms.

Explain ETS.

How are the animals of Arthropoda different from those of Mollusca? Give six points.

What is called respiratory organ? Describe the following structures for exchange of gases in animals:
(i) General body surface, (ii) Trachea, (iii) Gills.

Manish while performing a practical in laboratory on Grams stain observed that one type of bacteria stained dark blue or purple in colour, while the other type of bacteria did not retain the crystal violet dye even after staining again and again. Instead it keeps on loosing the dye on washing. He rushed to his teacher for showing the specimen.

His teacher explained that there is nothing to get worried about. As different kinds ofbacteria are found.

1. What is the basis of classifying bacteria.
2. What is the basic difference between Gram positive and Gram negative bacteria.
3. Name one Gram positive and one Gram negative bacteria.
4. What values are shown by Manish's teacher?