Cell Biology and Structure

The large central vacuole in plant cells acts as a storage reservoir. It holds water, enzymes, inorganic ions, and organic molecules like sugars and amino acids that are vital for the plant's life processes.

Vacuoles in plant cells are filled with cell sap, which creates turgor pressure against the cell wall. This pressure provides the necessary turgidity and rigidity to keep the plant upright and maintain its structure.

Haematoxylin stains cell nuclei blue, while eosin stains cytoplasm, connective tissue and other extracellular substances pink or red. Eosin is strongly absorbed by red blood cells, colouring them bright red.

Tissues are found in both plants and animals. While cells in a tissue are specialized and often similar in structure and function, the claim that they only exist in animals is incorrect.

The cell is the basic structural, functional, and biological unit of all known living organisms. Tissues are groups of cells, and organs are groups of tissues, but the cell is the smallest unit of life.

Meristematic cells are undifferentiated cells capable of continuous division. Once they stop dividing, they undergo differentiation, where they grow and mature into specialized cells with specific functions. This process leads to the formation of permanent tissues such as parenchyma, xylem, or phloem.

Sclerenchyma cells provide mechanical strength and rigidity to the plant. During maturation, their cell walls become heavily thickened with lignin, a complex organic polymer. This lignification makes the walls impermeable, leading to the death of the cell's living contents.

In multicellular organisms, as the body size increases, individual cells cannot efficiently perform all necessary life functions for the whole organism. Tissues allow for a division of labor, where groups of cells specialize to perform specific tasks like transport or support. This organization is essential for managing the complexity of a larger body.

Collenchyma is a living tissue that provides mechanical support, especially in young, growing plant parts. Its cells are characterized by primary walls that are unevenly thickened, particularly at the corners where multiple cells meet. This structure allows for both strength and flexibility.

Plants and animals have evolved different tissue systems to suit their distinct lifestyles. Plants are autotrophic and stationary, requiring tissues for support and photosynthesis, while animals are heterotrophic and mobile, requiring muscular and nervous tissues. Thus, they are not made of the same types of tissues.

A tissue is defined as a collection of cells that share a common origin and are similar in structure. These cells work together as a unit to perform a specific function or set of functions. This structural and functional similarity is the basis of tissue organization in multicellular organisms.

This option is correct. Glycophorin C plays an important role in maintaining erythrocyte shape and regulating membrane material properties.

Guard cells contain chloroplasts to manufacture the food by photosynthesis, but epidermal cells lack chloroplasts.

Pluripotency is the ability of a cell to differentiate into many different cell types that make up the body, but not the extra-embryonic tissues. Totipotency is the ability to differentiate into all possible cell types, including the placenta.

A polyribosome, or polysome, consists of a cluster of ribosomes held together by a strand of messenger RNA (mRNA). This structure allows for the simultaneous translation of a single mRNA molecule into multiple copies of a protein.