Structural Organisation in Animals — BIOLOGY STD 11 Science — Question

During the biology class, teacher taught that water should be conserved in the body of animals because it is precious and non-renewable in some cases. He asked the student that how the nature conserves water even through the excretory system are present in different organisms.

1. Name three major excretory products of animals.
2. Does loop of Henle play any role in water conservation in humans?
3. Explain excretory organs in different animal groups.
4. What values does the teacher possess?

List out various excretory organs in different animals.

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?

Define osmosis. Explain the difference between active transport and passive transport.

Differentiate between Aerobic respiration and fermentation

Describe the various kinds of skeletal joints in human body, according to their mobility, giving one example of each.

Describe the main characteristics of Arthropoda phylum and make labelled diagrams of any two animals.

Neural system and computers share certain common features. Comment in five lines. (Hint: CPU, input-output devices).

Describe the various types of placentations found in flowering plants.

Which factors were responsible for the extinction of dinosaurs(ancient reptiles)? Why reptiles became the first successful land animals?