Biology Topic 5 Calculating productivity , parctices and energy transfer , percentage yield

What equation is used for net primary productivity?

NPP = GPP - R

What equation is used for net productivity of consumers

N = I - (F = R)

What makes productivity differnet from production?

Productivity uses the same equations but units include time

How can farmers increase production?

By simplifying food webs and reducing respiratory losses

Why do farmers remove pests?

Pets reduce crop biomass lowering the net primary productity

How can pests be removed?

Using pesticides or biological control (using living organisms e.g preditors)

How can farmers reduce respiratory losses in live stock?

Restrict movement, keep animals warm , use antibiotics

Why does reducing movemnt of animals increase production?

Less energy used for muscle activity so more energy (animal uses less energy so more is available for growth)

Why does keeping animas warm increase production?

Less energy used for temperature regulation

Why do antibiotics increase production?

LEss energy used by the immune system

e.g when infected the immune system doesnt have to produce a response

What ethical issues are linked to practices that preserve the energy within animals?

REduced animal welfare

What is a theoretical yeild?

The yield possible under ideal coditions

What is actual yield?

The yield actually produced

What is the formula for percentage yield?

% yield = (actual dividec by theoretical ) x100