Animals like whale, walrus live in water (ocean). Whether they are included in Pisces or Mammalia?

Animals like whale have very thick blubber.Give reasons.

Animals like gharial and crocodile live in land. Are they amphibians or reptiles?

Give scientific reasons : Though tortoise lives on land as well as in water, it cannot be included in class- Amphibia.

Medicines are either man made (i.e.,synthetic) or obtained from living organisms like plants, bacteria, animals etc. and hence the latter are called natural products. Sometimes natural products are chemically altered by man to reduce toxicity or side effects. Write against each of the following whether they were initially obtained as a natural product or as a synthetic chemical. Penicillin______________.

Medicines are either man made (i.e.,synthetic) or obtained from living organisms like plants, bacteria, animals etc. and hence the latter are called natural products. Sometimes natural products are chemically altered by man to reduce toxicity or side effects. Write against each of the following whether they were initially obtained as a natural product or as a synthetic chemical. Sulfonamide_______.

Medicines are either man made (i.e.,synthetic) or obtained from living organisms like plants, bacteria, animals etc. and hence the latter are called natural products. Sometimes natural products are chemically altered by man to reduce toxicity or side effects. Write against each of the following whether they were initially obtained as a natural product or as a synthetic chemical. Vitamin C__________.

Medicines are either man made (i.e.,synthetic) or obtained from living organisms like plants, bacteria, animals etc. and hence the latter are called natural products. Sometimes natural products are chemically altered by man to reduce toxicity or side effects. Write against each of the following whether they were initially obtained as a natural product or as a synthetic chemical. Growth Hormone______.

Complete the paragraph by choosing the approprite words given in the brackets: Complete the papragraph using proper words: (mechanical, Rhizobium, aquatic, Toxic, co_2 Nitrogen, Pseudomonas, Amoeba, bacteria, hydrocarbons) Spilling of petroleum oil occurs in ocean due to various reasons. This oil may prove fatal and toxic to organisms. It is not easy to remove the oil layer from surface of water by ............. method. However, bacteria like ................ spp. and Alcanovorax borkumensis have the ability to destroy the pyridines and other chemicals. Hence. these ................ are used to clear the oil spills. These are called hydrocarbonoclastic bacteria (HCB). HCB decompose the ....--.----- and bring about the reaction of carbon with oxygen. ...--------- and water is formed in this process.

State whether the following statements are true or false. Correct the false statements: Fungi like yeasts and moulds are included in division bryophyta.

It is said that elemental composition of living organisms and that of in animate objects (like earth's crust) are similar in the sense that all the majorelements are present in both. Then what would be the difference between these two groups? Choose a correct answer from among the following: