Biology Le4 Flashcards
Energy in ecosystems (7 cards)
1
Q
Explain why most food chains are 4 or less organisms in length
A
The energy loss is big so its not enough to continue.
2
Q
What shape does a pyrimid of energy always take
A
Triangle
3
Q
Give 2 reasons why a pyrimid of numbers may have an irregular shape
A
Flees and ticks or if the producer is a tree
4
Q
What do the arrows in a food chain represent
A
Direction of energy
5
Q
Name three ways in which energy can be lost from a food chain/ web?
A
Heat, movement and undigested materials
6
Q
If 90% of the energy is lost what is the remaining 10% used for?
A
The 10% is used for growth
7
Q
Desribe a pyrimid of numbers
A
A pyrimid of numbers shows the numbers of organisms at each level of the food chain
