The fundamental Unit of Life Class - IX

Ribosomes are the sites of protein synthesis, not carbohydrate manufacture. Therefore, the statement is false.

Genes are indeed the functional units of heredity, consisting of specific segments of DNA that code for proteins.

The rod-shaped structures in the nucleus are chromosomes, not the endoplasmic reticulum. The endoplasmic reticulum is a network of membranes in the cytoplasm.

An isotonic solution is defined as a medium that has the same water concentration as the cell, resulting in no net movement of water.

A hypotonic solution has a higher water concentration than the cell, causing water to move into the cell. This is the correct definition.

Osmosis is the specific term for the movement of water across a selectively permeable membrane from a region of higher water concentration to a lower one.

Diffusion is the general process of movement of molecules from an area of higher concentration to an area of lower concentration.

The nucleus controls cellular activities and contains genetic material, which is why it is often referred to as the brain or control center of the cell.

The smooth endoplasmic reticulum is responsible for lipid synthesis and the detoxification of drugs and poisons in liver cells.

Chromosomes are made of DNA coiled around histone proteins. RNA molecules are transcribed from DNA but are not structural chromosome components. Lipids are major components of cell membranes, not chromosomes.

Bacteria are single-celled organisms, making them unicellular. Cockroaches, sparrows, and mosquitoes are multicellular organisms.

The endoplasmic reticulum forms an extensive network throughout the cell, transporting materials between different regions. The nucleus controls activities, vacuoles store materials, and Golgi bodies modify and package proteins.

Ribosomes are the cellular organelles where protein synthesis occurs.

Mitochondria (and chloroplasts) are unique organelles that contain their own DNA and ribosomes, supporting the endosymbiotic theory.

ATP stands for Adenosine Triphosphate, which is the primary energy carrier in cells.

Robert Hooke is credited with the discovery of cells in 1665 after observing cork under a microscope. The other names listed are not associated with this biological discovery.

Lysosomes contain digestive enzymes that break down waste materials, cellular debris, and foreign invaders. They are often referred to as the suicide bags of the cell because they can digest the cell itself if it is damaged.

Leucoplasts are colorless plastids primarily responsible for the storage of nutrients like starch, oils, and proteins. Chromoplasts contain pigments, and chloroplasts are for photosynthesis.

The nucleus contains the genetic material (DNA) of the cell and regulates all cellular activities, including metabolism and reproduction. It acts as the control center of the eukaryotic cell.

Mitochondria are the sites of cellular respiration, where energy in the form of ATP is generated. This function earns them the title of the powerhouse of the cell.