The question asks about the fundamental reason for the existence of solid, liquid, and gas states of matter. This relates to the microscopic structure and interactions within matter.
Correct Option: D) Particles. The states of matter (solid, liquid, gas) are primarily determined by the characteristics of the particles (atoms, molecules, or ions) that make up the matter, specifically their arrangement, the forces between them, and their kinetic energy.
The question asks about the role of biofilters in Recirculating Aquaculture Systems (RAS). We need to evaluate each statement regarding their function in waste treatment and nutrient cycling.
B) Only two. Statements 1 and 3 are incorrect, while statement 2 correctly describes the function of biofilters.
The question asks about the state of matter that tends to maintain its shape when an external force is applied. This property is directly related to the intermolecular forces and the arrangement of particles within the substance.
Correct Option: B) Solids have strong intermolecular forces and a fixed arrangement of particles, which gives them a definite shape and volume. They resist deformation when an external force is applied, thus maintaining their shape.
This question tests fundamental knowledge about the states of matter, specifically the properties of liquids. We need to recall the defining characteristics of liquids concerning their shape and volume.
Correct Option: C) Volume — Liquids do not have a fixed shape; they conform to the shape of their container. However, they do possess a fixed volume, meaning a given quantity of liquid will always occupy the same amount of space regardless of the container's shape.
The question asks for a general term that describes substances like liquids, which can flow and change shape, indicating they are not rigid. We need to identify the scientific term that encompasses these characteristics.
Correct Option: A) Fluid
The question asks about the gas that aquatic animals utilize for respiration while living underwater. Respiration is a fundamental biological process that requires a specific gas for energy production.
Correct Option: D) Oxygen
Aquatic animals, like fish, breathe underwater by extracting dissolved oxygen from the water using their gills. Gills are specialized organs that allow for the efficient exchange of gases, absorbing oxygen and releasing carbon dioxide.