Anatomy

Step 1: Understanding ventricular system.
The brain contains a series of interconnected cavities called ventricles that circulate cerebrospinal fluid.
Step 2: Connection between ventricles.
Each lateral ventricle communicates with the third ventricle through an opening known as the interventricular foramen or foramen of Monro.
Step 3: Conclusion.
Hence, the correct answer is (B) foramen of Monro.

Step 1: Understanding the diagram.
The diagram represents a tissue section with various types of cells. In such diagrams, the P and Q indicate different cellular structures.
Step 2: Analyzing the options.
(A) P - Medulla; Q - Macrophage: Incorrect — This does not match the appearance of the cells shown in the diagram.
(B) P - Cytoplasm; Q - Fibroblast: Incorrect — The diagram does not indicate cytoplasm and fibroblasts clearly.
(C) P - Matrix; Q - Mast cell: Incorrect — This does not match the appearance of the tissue cells.
(D) P - Matrix; Q - Adipocyte: Correct — The cells are identified correctly based on the structure shown in the diagram.
Step 3: Conclusion.
The correct answer is (D) P - Matrix; Q - Adipocyte, as the P is the matrix and Q is identified as adipocyte in the diagram.

Step 1: Understanding the question.
The question asks about the region of the root where the tubular, colorless prolongations of epidermal cells are found. These structures are known as root hairs.
Step 2: Analyzing the options.
(A) Cell division: The region of cell division is where cells actively divide to form new cells but does not feature root hairs.
(B) Absorption: Correct — Root hairs are found in the region of absorption, where they increase the surface area for water and mineral uptake.
(C) Maturation: In the maturation region, cells mature and differentiate, but root hairs are mostly absent.
(D) Cell elongation: In this region, cells elongate, but root hairs are mainly present in the absorption zone.
Step 3: Conclusion.
The correct answer is (B) Absorption, as root hairs, which are tubular, colorless projections, are primarily found in this region.