G.K. (General Science) - 28

Living things generally exhibit characteristics such as movement, respiration, and the need for nutrients (food, air, water). Since all listed options are standard biological characteristics, the correct choice is all of the above.

The boiling point of sodium chloride (NaCl) is approximately 1413 degrees Celsius.

Ionic compounds are formed by the electrostatic attraction between positively charged ions (cations) and negatively charged ions (anions).

Glucose and starch are both types of carbohydrates. Carbohydrates are organic compounds consisting of carbon, hydrogen, and oxygen.

Organisms that synthesize their own food from inorganic substances like carbon dioxide and water are autotrophs. Heterotrophs rely on others, while carnivores and herbivores are specific types of heterotrophs.

Ionic compounds consist of ions held together by strong electrostatic forces of attraction, which require significant energy to break. Covalent compounds generally have weaker intermolecular forces, leading to lower melting and boiling points.

Ionic compounds are polar in nature and dissolve readily in polar solvents like water due to the hydration energy overcoming the lattice energy. They are generally insoluble in non-polar solvents like ether or benzene.

Heterotrophic organisms cannot produce their own food from inorganic sources and must consume other organisms. Autotrophs are the opposite, and carnivores/herbivores are specific subsets of heterotrophs.

A parasite derives nutrients from another living organism, which is referred to as the host. The host is harmed by this interaction.

Herbivores are animals that exclusively consume plant material. Carnivores eat other animals, and omnivores consume both.

Water is a highly polar solvent with a high dielectric constant, which allows it to effectively separate ions in ionic compounds. Non-polar solvents like benzene and ether have very low dielectric constants.

Roundworms and Plasmodium are parasites that obtain nutrients from their hosts. Saprotrophic organisms feed on dead matter, and holozoic organisms ingest solid food.

Ionic compounds conduct electricity when their ions are free to move. This occurs in the aqueous state (dissolved in water) or in the molten (melted) state. In the solid state, ions are locked in a rigid lattice.

Saprotrophic nutrition involves organisms secreting enzymes onto dead or decaying organic matter to break it down externally before absorbing the nutrients. This is common in fungi and some bacteria.

Diamond and graphite are allotropes of carbon with giant covalent network structures. These structures require breaking many strong covalent bonds to melt or boil, resulting in very high melting and boiling points.

Covalent compounds are formed by the sharing of electrons between atoms, resulting in electrically neutral molecules. They do not consist of ions like ionic compounds.

Photosynthesis requires sunlight as an energy source, chlorophyll to capture that light, and carbon dioxide and water as raw materials to produce glucose and oxygen.

Assimilation is the process by which absorbed nutrients are incorporated into the cells of an organism to be used for energy, growth, and repair. Digestion is the breakdown, and absorption is the uptake into the blood.

Iodine solution is a standard test for starch. When iodine reacts with starch, it forms a complex that results in a characteristic blue-black color.

NaCl is an ionic compound. In solid form, its ions are fixed in a lattice and cannot move. When dissolved in water (aqueous solution), the ions dissociate and become mobile, allowing the solution to conduct electricity.

Digestion is the biological process of breaking down large, complex, insoluble food molecules into smaller, simpler, water-soluble molecules that can be absorbed by the body.

Covalent compounds are composed of discrete molecules held together by weak intermolecular forces (like Van der Waals forces). These weak forces are easily overcome, which is why many are gases or liquids at room temperature.

NaCl (sodium chloride) is an ionic compound formed by the transfer of an electron from sodium to chlorine. Glucose, naphthalene, and iodine are all covalent compounds.

Omnivores are animals that have a diet consisting of both plant and animal matter. Herbivores eat plants, and carnivores eat animals.

Naphthalene is a common organic covalent compound with a melting point of approximately 80 degrees Celsius.