Starch grains in latex are

Which of the following provides the most durable wood?

$Casuarina$ $equisetifolia$ is a

Which useful product is derived from the epidermis?

Identify the correct set of statements :
$(a)$ The leaflets are modified into pointed hard thorns in Citrus and Bougainvillea
$(b)$ Axillary buds form slender and spirally coiled tendrils in cucumber and pumpkin
$(c)$ Stem is flattened and fleshy in Opuntia and modified to perform the function of leaves
$(d)$ Rhizophora shows vertically upward growing roots that help to get oxygen for respiration
$(e)$ Subaerially growing stems in grasses and strawberry help in vegetative propagation
Choose the correct answer from the options given below:

The longest cell of plants is found in: