Explanation

• Ethyl alcohol was prepared by Al-Razi (also known as Rhazes).
• He was a Persian polymath who made significant contributions to chemistry and medicine, including the distillation of alcohol.

Explanation

• A molecular formula is a chemical formula that shows the actual number and type of atoms in a molecule.
• It is a way to represent the composition of a molecule using symbols and numbers.

For example:

• Water: H2O (two hydrogen atoms and one oxygen atom)

Explanation

A diatomic molecule is a molecule composed of two atoms, either of the same element (homogeneous) or different elements (heterogeneous).

Examples of diatomic molecules include:

• Hydrogen (H2)
• Oxygen (O2)
• Nitrogen (N2)

Explanation

The molar mass of H2SO4, also known as sulfuric acid, is 98 grams per mole (g/mol).

Explanation

• The cortex is the layer of tissue between the epidermis (outermost layer) and endodermis (inner layer) in plant roots.
• It's a region of parenchymatous cells that stores food, water, and nutrients.

Explanation

• Filtration
• Sedimentation
• Decantation
• Distillation
• Chromatography

Explanation

• Gram atomic mass (GAM) is the atomic mass of an element expressed in grams.
• It represents the mass of one mole of atoms of that element.

Explanation

In an open circulatory system, blood bathes the tissues directly, flowing through spaces among tissues, such as sinuses or lacunae. This type of circulation is found in:

• Invertebrates like insects, mollusks, and crustaceans
• Some lower vertebrates like fish and amphibians

Explanation

Human plasma proteins consist of:

• Fibrinogen (A): involved in blood clotting
• Albumin (C): helps regulate blood volume and transport various molecules

Explanation

• In the context of phloem transport, "source" refers to the location where sucrose is produced (usually leaves).
• While "sink" refers to the location where sucrose is consumed or stored (e.g., roots, stems, fruits, and storage organs).
• A mature leaf is typically a source, not a sink, as it produces sucrose through photosynthesis.