Science MCQs

Osmosis is the diffusion of water across a membrane from a less concentrated to a more concentrated solution.

Xylem vessels are dead cells that form hollow tubes for water conduction.

The petiole is the stalk that supports the leaf blade.

Palisade mesophyll cells are columnar and are the primary site of photosynthesis.

Glucose is a reactant in respiration, not a product.

Transpiration pull is the suction force that draws water up the xylem.

Nitrogen is a key component of amino acids, which build proteins.

The cortex, made of parenchyma cells, is located between the epidermis and the endodermis.

Translocation is the process of transporting sugars and other organic compounds in the plant.

Companion cells are living cells that manage the function of sieve tube elements.