Identify the correct set of statements: [2022]
(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:
(B) and (C) only
(A) and (D) only
(B), (C), (D) and (E) only
(A), (B), (D) and (E) only
(3)
The axillary buds of the stem are modified into pointed hard thorns in Citrus and Bougainvillea.
In Bougainvillea, thorns are the modifications of [2017]
adventitious root
stem
leaf
stipules
Which of the following is not a stem modification? [2016]
Tendrils of cucumber
Flattened structures of Opuntia
Pitcher of Nepenthes
Thorns of citrus
(3)
Pitcher of Nepenthes is a modification of leaf. In Nepenthes, the pitchers are meant for catching and digesting insects. The lamina is modified into a pitcher. The leaf apex gives rise to a coloured lid for attracting the insects.
Stems modified into flat green organs performing the functions of leaves are known as [2016]
phylloclades
scales
cladodes
phyllodes
(1)
Phylloclades are flattened green stems which have taken over the function of photosynthesis while cladodes are only the branches of stem that are modified to take over the function of leaves.
An example of edible underground stem is [2014]
carrot
groundnut
sweet potato
potato
(4)
Carrot and sweet potato are root modifications while the edible part of groundnut is a seed. Potato is an edible underground stem.
