CameraIcon
CameraIcon
SearchIcon
MyQuestionIcon
MyQuestionIcon
1
You visited us 1 times! Enjoying our articles? Unlock Full Access!
Question

Regarding assertion and reason, choose the correct statement
Assertion [A]: Marine ecosystems have lesser trophic levels than terrestrial ecosystems.
Reason [R]: Most of the phytoplankton is available for consumption and assimilation by primary consumers in aquatic ecosystems.

A
Both A and R are true and R explains A
No worries! We‘ve got your back. Try BYJU‘S free classes today!
B
Both A and R are true R does not explain A
No worries! We‘ve got your back. Try BYJU‘S free classes today!
C
A is true and R is false
No worries! We‘ve got your back. Try BYJU‘S free classes today!
D
A is false and R is true
Right on! Give the BNAT exam to get a 100% scholarship for BYJUS courses
E
Both A and R are false
No worries! We‘ve got your back. Try BYJU‘S free classes today!
Open in App
Solution

The correct option is D A is false and R is true
In marine ecosystems, phytoplankton carry out most of the photosynthesis that occurs. Phytoplankton are small organisms like diatoms with extremely simple structures, so most of their primary production or biomass is consumed by grazing organisms that feed on them. In contrast, a large fraction of the biomass that land plants produce, such as roots, trunks, are complex and cannot be consumed by herbivores for food, so proportionately less of the energy is fixed through primary production in terrestrial ecosystems. This is the reason why terrestrial ecosystems have smaller food chains or lesser trophic levels than marine ecosystems.

flag
Suggest Corrections
thumbs-up
0
Join BYJU'S Learning Program
similar_icon
Related Videos
thumbnail
lock
Ecological Pyramids
BIOLOGY
Watch in App
Join BYJU'S Learning Program
CrossIcon