0.3 State whether the following statements are True or take
1. Mass of H20 is 20grams
2. Noble gases are called non-reactive gases
3. Naked seeds are called angiosperms
4. Algae belongs to plantae kingdom
5. Catla fish is fast growing fish
Answers
1. is false because The average mass of one H2O molecule is 18.02 amu. The number of atoms is an exact number, the number of mole is an exact number; they do not affect the number of significant figures. The average mass of one mole of H2O is 18.02 grams. This is stated: the molar mass of water is 18.02 g/mol.
2. is true because Noble gases belong to the 18th group of the periodic table. They include helium, neon, argon, krypton, xenon and radon. They are called inert gases because they are stable and non-reactive.
3. is false because Gymnosperms are the seed bearing plants wherein seeds are naked i.e. not enclosed by ovary or fruit. Angiosperms are seed bearing plants wherein seeds are enclosed within ovary or fruit.
4. is true because algae belong to the Plantae kingdom, being the simplest plants. They are unicellular and multicellular organisms, some of them reaching huge sizes. ... These include single-cell organisms as well as multicellular seaweeds, which have an important position in the diet of coastal communities.
5. is false because Being a surface feeder that is highly preferred by consumer, catla forms an integral component in carp polyculture systems in all the countries where it is reared, including India, Bangladesh, Pakistan, Nepal, Laos and Myanmar. It is the fastest growing species among the three Indian major carps.