Insights Mock Environment 1 Flashcards
This was the first paper on Environment which was taken by me, therefore most questions are covered here itself. Score- 54
homeostasis
constancy of its internal environment (a process called homeostasis) despite varying external environmental conditions that tend to upset its homeostasis.
Plants, _______have mechanisms to maintain internal temperatures.
do not
majority (99 per cent) of animals and nearly all plants _____maintain a constant internal environment. Their body temperature changes with the ambient temperatur
cannot
main reason why very small animals are rarely found in polar regions.
Since small animals have a larger surface area relative to their volume, they tend to lose body heat very fast when it is cold outside; then they have to expend much energy to generate body heat through metabolism. This is the main reason why very small animals are rarely found in polar regions.
aestivation
prolonged torpor or dormancy
desiccation
removal of moisture from something
Some snails and fish go into aestivation to avoid
summer–related problems-heat and dessication
Under unfavourable conditions many zooplankton species in lakes and ponds are known to enter
diapause, a stage of suspended development.
special photosynthetic pathway (CAM) t
enables the (of desert) stomata to remain closed during day time
Allen’s rule
animals adapted to cold climates have shorter limbs and bodily appendages than animals adapted to warm climates.
Bergmann’s rule
ecogeographical rule that states that within a broadly distributed taxonomic clade, populations and species of larger size are found in colder environments, while populations and species of smaller size are found in warmer regions.
Gloger’s rule
within a species of endotherms, more heavily pigmented forms tend to be found in more humid environments, e.g. near the equator
Gause’s law
Georgy Gause that two species competing for the same limited resource cannot coexist at constant population values.
Amensalism
one species is harmed whereas the other is unaffected.
interaction where one species is benefitted and the other is neither benefitted nor harmed
commensalism
\+ + - - \+ - \+ - \+ 0 - 0
Mutualism Competition Predation Parasitisim Commensalism Amensalism
Secondary productivity
Secondary productivity is defined as the rate of formation of new organic matter by consumers.
Primary production
Primary production is defined as the amount of biomass or organic matter produced per unit area over a time period by plants during photosynthesis.
detritus
waste or debris of any kind
fragmentation.
Detritivores (e.g., earthworm) break down detritus into smaller particles. This process is called fragmentation.
catabolism.
Bacterial and fungal enzymes degrade detritus into simpler inorganic substances.
Humification
leads to accumulation of a dark coloured amorphous substance called humus that is highly resistant to microbial action and undergoes decomposition at an extremely slow rate
Being colloidal in nature it serves as a reservoir of nutrients
Hummus
The humus is further degraded by some microbes and release of inorganic nutrients occur by the process known as
mineralisation