Plant Kingdom Question 590
Question: Assertion : Cycas has two types of root-tap root system and coralloid roots. Reason : Coralloid root contains Anabaena.
Options:
A) If both the assertion and the reason are true and the reason is a correct explanation of the assertion
B) If both the assertion and reason are true but the reason is not a correct explanation of the assertion
C) If the assertion is true but the reason is false
D) If both the assertion and reason are false
Show Answer
Answer:
Correct Answer: B
Solution:
In Cycas, the primary root persists and forms a tap-root system.
Some of the lateral roots branch repeatedly to form dwarfed dichotomously branched coral-like masses.
They are called the coralloid roots or corallorhiza.
They become inhibited by a blue green alga Anabaena cycadacearum.
The blue-green algae fixes atmopsheric N2 and thus plants get fixed nitrogen.
BETA
