| 261 |
Net primary productivity is equal to |
Biology/Biological Studies/Biotechnology/Biochemistry
Productivity and decomposition |
Easy |
| 262 |
The dark, amorphous, nutrient-rich substance formed during decomposition that is very resistant to microbial … |
Biology/Biological Studies/Biotechnology/Biochemistry
Productivity and decomposition |
Easy |
| 263 |
A grassland has a gross primary productivity of 1500 kcal m⁻² yr⁻¹, and the plants lose 400 kcal m⁻² yr⁻¹ in … |
Biology/Biological Studies/Biotechnology/Biochemistry
Productivity and decomposition |
Medium |
| 264 |
During decomposition, water-soluble nutrients move down into the soil and get precipitated as unavailable sal… |
Biology/Biological Studies/Biotechnology/Biochemistry
Productivity and decomposition |
Medium |
| 265 |
Leaf litter from two trees is left on the forest floor. Litter X is rich in lignin; litter Y is rich in nitro… |
Biology/Biological Studies/Biotechnology/Biochemistry
Productivity and decomposition |
Hard |
| 266 |
Approximately what fraction of photosynthetically active radiation is captured by plants? |
Biology/Biological Studies/Biotechnology/Biochemistry
Energy flow |
Easy |
| 267 |
The food chain that begins with dead organic matter is called |
Biology/Biological Studies/Biotechnology/Biochemistry
Energy flow |
Easy |
| 268 |
The mass of living material present at a trophic level at a particular time is called |
Biology/Biological Studies/Biotechnology/Biochemistry
Energy flow |
Medium |
| 269 |
Producers in a grassland fix 20,000 J of energy. Using the 10 per cent law, how much energy reaches the secon… |
Biology/Biological Studies/Biotechnology/Biochemistry
Energy flow |
Medium |
| 270 |
Food chains in nature rarely have more than four or five trophic levels. The main reason is that |
Biology/Biological Studies/Biotechnology/Biochemistry
Energy flow |
Hard |
| 271 |
Which ecological pyramid is always upright, whatever the ecosystem? |
Biology/Biological Studies/Biotechnology/Biochemistry
Ecological pyramids |
Easy |
| 272 |
The pyramid of biomass in a sea is generally inverted because |
Biology/Biological Studies/Biotechnology/Biochemistry
Ecological pyramids |
Easy |
| 273 |
A single large tree supports thousands of caterpillars, which are eaten by a few birds. The pyramid of number… |
Biology/Biological Studies/Biotechnology/Biochemistry
Ecological pyramids |
Medium |
| 274 |
Which is a limitation of ecological pyramids? |
Biology/Biological Studies/Biotechnology/Biochemistry
Ecological pyramids |
Medium |
| 275 |
In an ecosystem, the energy available is 10,000 J at the producer level. Assuming 10 per cent transfer, what … |
Biology/Biological Studies/Biotechnology/Biochemistry
Ecological pyramids |
Hard |
| 276 |
Variation in the concentration of reserpine in Rauwolfia vomitoria growing in different Himalayan ranges is a… |
Biology/Biological Studies/Biotechnology/Biochemistry
Biodiversity: concept and patterns |
Easy |
| 277 |
The rivet popper hypothesis, which compares species in an ecosystem to rivets in an aeroplane, was proposed by |
Biology/Biological Studies/Biotechnology/Biochemistry
Biodiversity: concept and patterns |
Easy |
| 278 |
In the species–area relationship log S = log C + Z log A, the value of Z for very large areas such as whole c… |
Biology/Biological Studies/Biotechnology/Biochemistry
Biodiversity: concept and patterns |
Medium |
| 279 |
Which is NOT one of the standard explanations for the high species diversity of the tropics? |
Biology/Biological Studies/Biotechnology/Biochemistry
Biodiversity: concept and patterns |
Medium |
| 280 |
An ecologist finds that a grassland plot with 16 plant species shows much smaller year-to-year changes in tot… |
Biology/Biological Studies/Biotechnology/Biochemistry
Biodiversity: concept and patterns |
Hard |