Distinguish between:
$(a)$ Litter and detritus
$(b)$ Primary and secondary productivity

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(N/A) Litter and detritus
Litter Detritus
$1$. Litter contains all kinds of wastes generated above the ground,often including human-made materials. $1$. Detritus is specifically composed of the remains of dead plants (fallen leaves,bark,flowers) and animals (fecal matter,carcasses).
$2$. Litter can contain both biodegradable and non-biodegradable matter (like plastic or glass). $2$. Detritus consists only of organic,biodegradable matter that can be broken down by decomposers.

$(b)$ Primary and secondary productivity
Primary Productivity Secondary Productivity
$1$. It is the amount of organic matter (biomass) produced by producers (green plants) per unit area over a period of time through photosynthesis. $1$. It is the rate of formation of new organic matter by consumers (herbivores and carnivores) over a period of time.

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