TextBook Solutions
- Why is it necessary to separate oxygenated and deoxygenated blood in mammals and birds? It is necessary to separate oxygenated and deoxygenated blood to maintain efficient supply of oxygen into the body. This system is essential... 1
- What are the components of the transport system in human beings? The main components of the transport system in human beings are the heart, blood, and blood vessels. Heart pumps oxygenated blood throughout... 1
- How are the lungs designed in human beings to maximize the area for exchange of gases? Lungs contain millions of alveoli which provide a surface for the exchange of gases. An extensive network of blood vessels is present in the... 1
- How is oxygen and carbon dioxide transported in human beings? Transport of Oxygen: The respiratory pigments (haemoglobin) present in red blood cells takes up the oxygen from the air to the lungs. They c... 1
- What are the different ways in which glucose is oxidized to provide energy in various organisms? At first glucose (6 carbon molecules) is broken in the cytoplasm of cells of all organisms. This process yields a 3 carbon molecule compound... 1
- What advantage over an aquatic organism does a terrestrial organism have with regard to obtaining Terrestrial organisms take up oxygen from the atmosphere whereas aquatic animals obtain oxygen from water. Air contains more O₂ as compared... 1
- How is the small intestine designed to absorb digested food? The small intestine has millions of tiny finger-like projections called villi. These villi increase the surface area for more efficient food... 1
- What is the function of digestive enzymes? Digestive enzymes such as amylase, lipase, pepsin, trypsin, etc. help in the breaking down of complex food particles into simple ones. These... 1
- What is the role of the acid in our stomach? Following are the roles of acid in our stomach: The hydrochloric acid present in our stomach dissolves bits of food and creates an acidic me... 1
- Where do plants get each of the raw materials required for photosynthesis? The following raw materials are required for photosynthesis: Carbon Dioxide: Plants get CO₂ from atmosphere through stomata. Water: Plants a... 1
- What are the differences between autotrophic nutrition and heterotrophic nutrition? Autotrophic Nutrition Heterotrophic Nutrition Food is synthesised from simple inorganic raw materials such as CO₂ and water. Food is obtaine... 1
- What processes would you consider essential for maintaining life? Life processes such as nutrition, respiration, transportation, excretion, etc. are essential for maintaining life. 1
- What are outside raw materials used for by an organism? Various outside raw materials used by an organism are as follows: Food as source of supplying energy and materials. Oxygen for breakdown of... 1
- What criteria do we use to decide whether something is alive? Any visible movement such as walking, breathing, or growing is generally used to decide whether something is alive or not. However, a living... 1
- Why is diffusion insufficient to meet the oxygen requirements of multi-cellular organisms like humans? Unlike the unicellular organisms, the multi-cellular organisms have complex body structures with specialized cells and tissues to perform va... 1
- Compare and contrast the arrangement of elements in Mendeleev's Periodic Table and the Modern Periodic Table. Mendeleev's periodic table Modern periodic table Elements are arranged in the increasing order of their atomic masses. Elements are arranged... 1
- In the Modern Periodic Table, calcium (atomic number 20) is surrounded by elements with atomic numbers The element with atomic number 12 has same chemical properties as that of calcium. This is because both of them have same number of valence... 2
- How does the electronic configuration of an atom relate to its position in the Modern Periodic Table? In the modern periodic table, atoms with similar electronic configurations are placed in the same column. In a group, the number of valence... 1
- Nitrogen (atomic number 7) and phosphorus (atomic number 15) belong to group 15 of the Periodic Table. Nitrogen (7): 2, 5 Phosphorus (15): 2, 8, 5 Since, electronegativity decreases with moving from top to bottom in a group, thus Nitrogen will... 1
- The position of three elements A, B and C in the Periodic Table are shown below - Group 16 Group 17 (a) A is a non-metal. (b) C is less reactive than A, as reactivity decreases down the group in halogens. (c) C will be smaller in size than... 1
- An atom has electronic configuration 2, 8, 7. (a) What is the atomic number of this element? (a) The atomic number of this element is 17. (b) It would be chemically similar to F(9) with configuration as 2, 7. 1
- What property do all elements in the same column of the Periodic Table as fluorine have in common Valency equal to 1. 2
- What property do all elements in the same column of the Periodic Table as boron have in common? Valency equal to 3. 2
- Which element has (a) two shells, both of which are completely filled with electrons? (a) Neon (b) Magnesium (c) Silicon (d) Boron (e) Carbon 2