15 public questions tagged with this topic.
Deserts have the lowest net primary productivity due to limited water availability and extreme climatic conditions. This follows from NCERT principle where the relation explains the outcome clearly for students in simple steps.
Ref: NCERT Biology Textbook for Class XI and XII (Botany section), Chapter: Morphology and Anatomy of Flowering Plants, Topic: Plant structure and tissue systems.
Tropical rainforests have the highest net primary productivity due to their high biodiversity, warm climate, and abundant rainfall.
Ref: NCERT Class 12 Biology Chapter 12: Ecosystem Productivity - Primary Secondary GPP NPP
Primary productivity varies across ecosystems and is influenced by factors such as sunlight, nutrient availability, and temperature.
Ref: NCERT Class 12 Biology Chapter 12: Ecosystem Productivity - Primary Secondary GPP NPP
Net Primary Productivity (NPP) is the amount of energy left after plants use some for respiration (R), calculated as NPP = GPP - R.
Ref: NCERT Class 12 Biology Chapter 12: Ecosystem Productivity - Primary Secondary GPP NPP
NPP is always less than GPP because it accounts for the energy lost through respiration.
Ref: NCERT Class 12 Biology Chapter 12: Ecosystem Productivity - Primary Secondary GPP NPP
Tropical rainforests have the highest net primary productivity per unit area due to abundant sunlight, water, and nutrient availability.
Ref: NCERT Class 12 Biology Chapter 12: Ecosystem Productivity - Primary Secondary GPP NPP
NPP is the energy available to herbivores after accounting for the energy used in respiration by plants.
Ref: NCERT Class 12 Biology Chapter 12: Ecosystem Productivity - Primary Secondary GPP NPP
NPP is always less than GPP because it accounts for the energy used in respiration by plants.
Ref: NCERT Class 12 Biology Chapter 12: Ecosystem Productivity - Primary Secondary GPP NPP
Open-ocean producers have very low standing biomass but extremely rapid turnover. Small phytoplankton cells divide quickly, experience efficient nutrient exchange, and are continually consumed, so annual net primary production can be large relative to the biomass present at any one sampling time. Primary production supports heterotrophic food webs by converting external energy into chemical energy stored in organic matter. The fate of that energy depends on maintenance respiration, growth, consumption, death, and decomposition. Carbon can be tracked as gross fixation, producer biomass incremen
Ref: Ecology: From Individuals to Ecosystems, Begon et al., 5th Ed., Ch. 17
Net primary productivity is the rate at which producers accumulate new organic matter after meeting their own respiratory costs. Gross primary productivity represents all carbon fixed or energy captured by autotrophs. Autotrophic respiration consumes part of that material to support cellular maintenance, active transport, tissue construction, and repair. The balance is therefore NPP = GPP − R, where R in this formula means respiration by primary producers, often written Ra. NPP supplies plant growth and reproduction and is the energy potentially available to herbivores and decomposers. Adding
Ref: Ecology: From Individuals to Ecosystems, Begon et al., 5th Ed., Ch. 17
“Deserts < Temperate forests < Tropical forests” for npp per unit leaf area increases in. This relationship follows from the ecological mechanism represented by the terms in the item, not merely from an association between their names. The relevant inference should follow the pathway from resource supply to organismal uptake and then to ecosystem-level flux. Productivity, trophic transfer, decomposition, and nutrient regeneration are connected, but each measures a different part of that pathway. The remaining alternatives—“Deserts < Tropical forests < Temperate forests”, “Temperate forests < T
Ref: Ecology: From Individuals to Ecosystems, Begon et al., 5th Ed., Ch. 17-19
The sequence hot deserts below temperate grasslands below tropical forests is a plausible increasing order of daily plant productivity per unit leaf area. Desert productivity is constrained by water shortage, heat, and short growth windows. Temperate grasslands gain more consistently during favourable seasons but face winter or drought, while tropical forests benefit from warm conditions and long growing periods. This metric should not be confused with standing biomass or productivity per unit ground area. Climate, nutrients, disturbance, species traits, and food-web structure interact, so bro
Ref: Ecology: From Individuals to Ecosystems, Begon et al., 5th Ed., Ch. 17-19
