Biomolecules

Correct Answer: B

1. Our biosphere contains many types of organisms.
2. These organisms are alive.
3. They show great variation in size, shape, and function.
4. This variation is called diversity.
5. Diversity exists only among living organisms.
6. Non-living things do not show biological diversity.
7. Hence, the correct word is living.
8. Therefore, there is wide diversity in living organisms in biosphere.

Correct Answer: C

1. Living organisms are composed of basic substances.
2. These substances are called chemicals.
3. Chemicals include elements and compounds.
4. Examples include carbon, hydrogen, oxygen, proteins, etc.
5. Chemistry helps us study these substances.
6. Elemental analysis is a method used in chemistry.
7. It helps identify elements present in organisms.
8. Hence, all living organisms are made of chemicals.
9. Therefore, the correct answer is chemicals (elements and compounds).

Correct Answer: B

1. Elemental analysis is used to identify elements in living tissues.
2. It can be performed on plant, animal, or microbial samples.
3. This analysis shows the basic composition of living matter.
4. The most abundant elements found are carbon, hydrogen, and oxygen.
5. These elements form the basis of biomolecules.
6. Other elements are also present in smaller amounts.
7. The result is expressed per unit mass of tissue.
8. Thus, the correct answer is carbon, hydrogen, and oxygen.

Correct Answer: B

1. Elemental analysis identifies elements present in any material.
2. It can be done for both living and non-living matter.
3. Earth’s crust is an example of non-living matter.
4. When analyzed, it also shows elements like oxygen, silicon, etc.
5. Many elements found in living organisms are also present in non-living matter.
6. Hence, the list of elements appears similar.
7. The difference lies in their proportion, not in their presence.
8. Therefore, the correct answer is similar list.

Correct Answer: C

1. Elemental analysis gives a list of elements present in a sample.
2. Both living and non-living matter contain similar elements.
3. Examples include carbon, hydrogen, oxygen, etc.
4. When compared in absolute terms (just presence or absence), no clear difference is seen.
5. Both lists look almost the same.
6. The difference is not in types of elements.
7. It lies in their proportion and organization.
8. Therefore, no such differences could be made out in absolute terms.

Correct Answer: C

1. Earth’s crust contains many chemical elements.
2. These elements include oxygen, silicon, aluminium, iron, etc.
3. Living tissues also contain chemical elements.
4. Many of these elements are common between living and non-living matter.
5. Elemental analysis shows that no element is exclusive only to earth’s crust.
6. All elements found in the crust can also be found in living tissue.
7. The difference is mainly in their proportions and combinations.
8. Therefore, the correct answer is living tissue.

Correct Answer: B

1. Both living and non-living matter contain similar elements.
2. However, their proportions differ significantly.
3. Living organisms are rich in organic compounds.
4. Organic compounds mainly contain carbon and hydrogen.
5. These elements form the backbone of biomolecules.
6. Hence, their relative abundance is higher in living organisms.
7. In contrast, earth’s crust has more minerals like silicon and metals.
8. Therefore, the correct answer is carbon and hydrogen.

Correct Answer: A

1. Atomic number is the number of protons in an atom.
2. Correct values are: H-1, C-6, O-8, N-7.
3. Sulphur has 16, Sodium 11.
4. Calcium is 20 and Magnesium is 12.
5. Silicon has atomic number 14.
6. Only option (a) correctly matches all elements.
7. Other options contain incorrect numbers.
8. Hence, option (a) is correct.

Correct Answer: A

1. The human body is mainly composed of a few key elements.
2. Oxygen is the most abundant (~65%).
3. Carbon (~18%) forms the backbone of organic molecules.
4. Hydrogen (~10%) is present in water and biomolecules.
5. Nitrogen (~3%) is found in proteins and nucleic acids.
6. Calcium (~1.5%) is important for bones and teeth.
7. Other elements like sulphur, sodium, magnesium are present in very small amounts (<1%).
8. Hence, option (a) is correct.

Correct Answer: A

1. Earth’s crust is mainly composed of a few major elements.
2. Oxygen is the most abundant (~46%).
3. Silicon is the second most abundant (~28%).
4. Aluminium (~8%) and iron (~5%) follow.
5. Calcium, sodium, potassium, and magnesium are present in smaller amounts.
6. These elements form minerals and rocks.
7. Other options show incorrect distributions.
8. Hence, option (a) is correct.