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Root and Root modifications- Practice Test 1
In one plant adventitious roots are modified for storage and in the other plant a lateral branch with short inter nodes and each node bearing a rosette of leaves and a tuft of roots is found. They are
[Kerala CEE, 2014]
Answer: Option A
The plant in which the adventitious roots are modified for storage purpose. is Sweet potato. Here food material is stuffed into the root and it takes the form of a tuber. The other plant with a lateral branch with short inter nodes is Pistia. Here each node bears a rosette of leaves and a tuft of roots is found at the bottom. Hence option A is correct.
Hygroscopic roots are found in Epiphytes. These hygroscopic roots are also called as velamen roots. The velamen roots contain, a special multilayered, dead hygroscopic epidermal tissue called velamen tissue
Assimilatory roots and spongy petioles are found in
Answer: Option A
Assimilatory roots and spongy petioles are found in Trapa. These modified roots absorb moisture from the atmosphere and also synthesize food materials by carbon assimilation. Hence, these roots are also known as assimilatory roots. Other examples include Tinospora and Trapa
The roots hanging from the branches of banyan tree are
[J&K CET, 2014]
Answer: Option C
The roots hanging from the branches of banyan tree are called prop roots. These are pillar like roots which arise from the branches. The roots remain hanging in the air for some time and finally reach the ground positively geotropically and grow in thickness. Prop roots offer mechanical support to the plant.
Pneumatophores are the characteristic features of mangroves. The aerial roots of mangroves have minute pores which help in the absorption of oxygen from air. These pores are called pneumatothodes and the roots bearing these pores are called pneumatophores. As mangroves live in marshy and saline soil their roots will not get enough oxygen supply for respiration.Also mangroves suffer from lack of oxygen because these soils are water logged. So mangrove plants produce these special aerial branches from the roots.