Question

Flow of energy in an ecosystem is always :
(a) unidirectional (b) bidirectional
(c) multidirectional (d) no specific direction
Or
Disposable plastic plates should not be used because:
(a) they are made of materials with light weight
(b) they are made of toxic materials
(c) they are made of biodegradable materials
(d) they are made of non-biodegradable materials
​

Answer 1

1. unidirectional

2. they are made of non biodegradable subdtancez

Answer 2

(a)$\large\bf\red{Unidirectional}$

$\large\mathfrak\blue{Explanation☞}$

The flow of energy is from prey to predator and it cannot be in the reverse direction. Hence the flow of energy is unidirectional.