AIIMS 2011
- Exam
- AIIMS
- Year
- 2011
- Subject
- Botany
- Chapter
- Morphology of Flowering Plants
AIIMS 2011 · Botany · Morphology of Flowering Plants
Assertion : A mangrove tree growing in marshy place has...
Assertion : A mangrove tree growing in marshy place has pneumatophores.
Reason : Pneumatophores help in better anchorage to marshy soil.
Options
- AIf both assertion and reason are true and reason is the correct explanation of assertion
- BIf both assertion and reason are true but reason is not the correct explanation of assertion
- CIf assertion is true but reason is false
- DIf both assertion and reason are false.
Correct answer
C. If assertion is true but reason is false
Step-by-step solution
Mangroves which form shallow littoral forests near sea shores areas are halophytes. Mangrove grow in physiologically dry environment (water is available in plenty but in the form of strong salt solution). These plants develop shallow rootings due to water logged environment where oxygen scarcity prevails. To ensure proper aeration in root system, plants produce respiratory roots or pneumatophores which are negatively geotropic peg-like projections above ground with numerous pores or lenticels for gaseous exchange: