Desert grasses often roll their leaves due to the presence of:

What is a vascular bundle called when phloem is present on both sides of the xylem and is separated from the xylem by strips of cambium?

The $3$ types of tissue systems,namely epidermal,ground,and vascular tissue systems,were proposed by whom?

$A$ student observed grass and $Hibiscus$ plants in his garden during noon. To his surprise,only the leaves of grass were found rolled inwards. The reason could be

Which one of the following is well-developed in hydrophytes?

Grass leaves curl inwards during very dry weather. Select the most appropriate reason from the following: