Question: 100% NCERT covered from Particular Keyword.Explanations are 100% from NCERT | [Difficult level: Easy] From NCERT NEET Derived Question.
Roots play insignificant role in absorption of water in
1. Wheat
2. Sunflower
3. Pistia
4. Pea
Answer:(3)
Pistia - roots are poorly developed as it is free floating hydrophyte.
👉A lateral branch with short
internodes and each node bearing a rosette of leaves and a tuft of roots is
found in aquatic plants like Pistia and Eichhornia.
Related Points from NCERT:
👉In banana, pineapple
and Chrysanthemum, the lateral branches originate from the basal and
underground portion of the main stem, grow horizontally beneath the
soil and then come out obliquely upward giving rise to leafy shoots.
👉In plants like mint and jasmine a slender lateral branch
arises from the base of the main axis and after growing aerially for some
time arch downwards to touch the ground.
👉Underground stems of some plants such as grass
and strawberry, etc., spread to new niches and when older parts die new
plants are formed.
👉Some plants
of arid regions modify their stems into flattened (Opuntia), or fleshy
cylindrical (Euphorbia) structures. They contain chlorophyll
👉Underground
stems of potato, ginger, turmeric, zaminkand, Colocasia are modified to
store food in them.
👉Stem tendrils which develop from
axillary buds, are slender and spirally coiled and help plants to climb
such as in gourds (cucumber, pumpkins, watermelon) and grapevines.
👉Axillary buds of stems may also get modified into woody, straight and
pointed thorns. Thorns are found in many plants such as Citrus,
Bougainvillea.
