Environment (Abiotic and Biotic factors) Questions in English

(B) Organisms that can tolerate and thrive in a wide range of temperatures are called eurythermal,whereas those that are restricted to a narrow range of temperatures are called stenothermal.
Mango trees cannot grow in temperate countries like Canada or Germany because they require a specific tropical climate.
Tuna fish and snow leopards also have specific temperature requirements and cannot survive in extreme fluctuations.
Therefore,mango,tuna fish,and snow leopards are classified as stenothermal organisms.

(C) The salinity of water is measured in parts per thousand $(ppt)$.
Inland water (freshwater) has a salinity of $< 5$ $ppt$.
Sea water has a salinity ranging between $30-35$ $ppt$.
Hyper saline lagoons have a salinity of $> 100$ $ppt$.
Therefore,the correct match is Hyper saline lagoons $= > 100$ $ppt$.

(C) The two most important abiotic factors that influence the life of organisms are water and temperature.
Temperature affects the kinetics of enzymes and basal metabolism of organisms.
Water is essential for all physiological processes,as life on Earth originated in water and is unsustainable without it.

(B) The temperature and humidity generally increase as one moves from the poles towards the equator due to the latitudinal gradient of solar radiation. At the equator,the sun's rays are more direct,leading to higher temperatures and increased evaporation,which results in higher air humidity. Conversely,moving from the equator to the poles,or from plains to mountain tops (altitudinal movement),results in a decrease in temperature.

(D) The correct sequence of terms is:
$(i)$ Aestivation: Snails undergo summer sleep to avoid heat and desiccation.
$(ii)$ Summer: The season associated with heat-related stress.
$(iii)$ Larger: Small animals have a larger surface area relative to their volume,leading to rapid heat loss.
$(iv)$ Very fast: Due to the high surface-area-to-volume ratio,they lose heat rapidly in cold environments.
$(v)$ Water: After temperature,water is the most critical factor influencing the distribution of organisms.
$(vi)$ Winter: Migratory birds visit Keoladeo National Park during the winter season.

(A) The statement in option $A$ is incorrect because organisms living in aquatic environments face water-related challenges,such as the chemical composition of water,$pH$,and specifically salinity. Based on their tolerance to salinity,aquatic organisms are classified as either $Euryhaline$ (can tolerate a wide range of salinities) or $Stenohaline$ (restricted to a narrow range of salinities).

(C) Phytoplanktons are found in the littoral zone,which is a shallow water region.
Lakes are subdivided into zones based on light penetration.
The littoral zone is the near-shore area where sunlight penetrates all the way to the sediment,allowing aquatic plants (macrophytes) and phytoplanktons to grow.
The limnetic (pelagic) zone is the open water area where light does not penetrate to the bottom.
The benthic zone is the bottom area covered by layers of mud in which various organisms live.
The profundal zone is the deepest part of a lake,relevant only in extremely deep lakes where light is absent.

(A) Abiotic components include the non-living physico-chemical factors of the environment.
These components not only affect the distribution and structure of organisms but also their behavior and inter-relationships.
Abiotic factors include inorganic substances,organic compounds,climatic factors,and edaphic factors.

(D) Halophytes ($i.e.$,plants growing in saline soils) exhibit the characteristics of xerophytes,such as $Sueda$,$Tamarix$,and $Atriplex$.
These adaptations include succulence,a thick cuticle,sunken stomata,high osmotic pressure,the presence of anthocyanin,tannins,proline,and other organic solutes,as well as a well-developed root system to manage physiological drought.

(D) Tropical rain forests,also known as tropical dense forests,are primarily found near the equator.
These regions are characterized by high annual rainfall and consistently high temperatures throughout the year.
These environmental conditions support high biodiversity and dense vegetation growth.

(C) The Earth's heat balance is maintained by the distribution of energy.
At latitudes near the equator,there is a surplus of heat because insolation exceeds terrestrial radiation.
Conversely,at higher latitudes,there is a deficit.
The transition point where the heat gain through insolation approximately equals the heat loss through terrestrial radiation occurs at approximately $40^{\circ}$ North and South latitudes.

(B) The major biomes are formed based on annual variations in temperature and precipitation.
Coniferous forests (also known as taiga or boreal forests) are characterized by evergreen,cone-bearing trees such as spruce and pine.
These biomes typically experience annual temperature variations ranging from $-1^{\circ}C$ to $13^{\circ}C$ and annual precipitation variations between $50 \; cm$ and $250 \; cm$.
Therefore,the given climatic conditions correspond to the formation of a Coniferous forest.

(N/A)

Heliophytes	Sciophytes
$(1)$ They are adapted to bright light.	$(1)$ They are adapted to low light intensities.
$(2)$ Stems are hard,thick with small internodes.	$(2)$ Stems are soft,slender with large internodes.
$(3)$ Thick cuticle on leaves.	$(3)$ Thin cuticle on leaves.
$(4)$ Root system is extensively developed.	$(4)$ Root system is less extensively developed.
$(5)$ There is a good amount of flowering and fruiting.	$(5)$ Vegetative growth is more as compared to flowering and fruiting.
$(6)$ Sunken stomata are generally present on the lower surface of the leaf.	$(6)$ Stomata are at the level of the surface and present on both surfaces.

(A) Based on the provided images:
$I$ represents a coastal area with palm trees.
$II$ represents a dense tropical rain forest.
$III$ represents a desert landscape.
$IV$ represents a deciduous forest.
Matching these with the given options:
$P$ (Deciduous forest) matches with $IV$.
$Q$ (Desert) matches with $III$.
$R$ (Tropical rain forest) matches with $II$.
$S$ (Coastal area) matches with $I$.
Therefore,the correct sequence is $(P-IV), (Q-III), (R-II), (S-I)$.

(A) Temperature is considered the most ecologically relevant environmental factor because it significantly affects the kinetics of enzymes and through them,the metabolic activity and other physiological functions of the organism. While water,light,and soil are also crucial,temperature has a direct and profound impact on the survival and distribution of organisms across different biomes.

(D) Temperature varies significantly across different biomes.
$1$. As we move from plains to mountain tops (increase in altitude),the temperature decreases.
$2$. As we move from the equator towards the poles (increase in latitude),the temperature decreases.
Therefore,both cases $A$ and $C$ result in a decrease in temperature.

(A) The distribution of organisms is significantly influenced by temperature, which varies across different habitats:
$1$. $P$. Sub-zero levels: These temperatures are characteristic of $II$ (Polar regions) and $III$ (High altitude areas).
$2$. $Q$. Can exceed $50^{\circ}C$: These high temperatures are typically found in $V$ (Tropical deserts).
$3$. $R$. Can even exceed $100^{\circ}C$: These extreme temperatures are found in $I$ (Thermal springs) and $IV$ (Deep-sea hydrothermal vents).
Therefore, the correct matching is $(P - II, III), (Q - V), (R - I, IV)$.

(C) $1$. Organisms that can tolerate and thrive in a wide range of temperatures are called $Eurythermal$ organisms.
$2$. Organisms that are restricted to a narrow range of temperatures are called $Stenothermal$ organisms.
$3$. The terms $Euryhaline$ and $Stenohaline$ refer to the tolerance of organisms to a wide or narrow range of salinities,respectively.
$4$. Therefore,$P$ is $Eurythermal$ and $Q$ is $Stenothermal$.

(A) Temperature is considered the most ecologically relevant environmental factor. It varies significantly from the equator towards the poles and from plains to mountain tops. The kinetics of enzymes and other metabolic activities of organisms are highly dependent on the ambient temperature of their environment.

(A) The salt concentration (salinity) measured in parts per thousand $(ppt)$ varies across different aquatic environments:
$1$. Inland waters (freshwater) have a very low salt concentration,typically less than $5\%$ $(P-I)$.
$2$. The sea (marine water) has a salt concentration ranging between $30-35\%$ $(Q-III)$.
$3$. Hypersaline lagoons (or hypersaline waters) have a very high salt concentration,often exceeding $100\%$ $(R-II)$.
Therefore,the correct matching is $P-I, Q-III, R-II$.

(A) The correct answer is $A$.
Organisms living in aquatic habitats do face water-related problems,such as osmotic stress,which depends on the salinity of the water.
Option $B$ is correct because desert organisms have specific adaptations (like succulent stems or nocturnal habits) to cope with water scarcity.
Option $C$ is correct as water is a critical limiting factor for plant growth and distribution.
Option $D$ is correct because marine organisms are adapted to high salinity environments and cannot maintain osmotic balance in freshwater,leading to cell lysis or death.

(D) Light is a crucial abiotic factor that influences various biological processes in organisms.
Many organisms use light as a cue to time their foraging,reproductive,and migratory activities.
This phenomenon is known as photoperiodism,where the duration of light exposure regulates physiological responses.
Therefore,all the listed activities are timed based on light cues.

(C) The nature and properties of soil in different places are determined by climate,the weathering process,whether the soil is transported or sedimentary,and how soil development occurred. Light is an abiotic factor that influences photosynthesis and biological rhythms but does not directly determine the physical or chemical properties of soil formation.

(B) The nature and properties of soil in different places vary; it is dependent on the climate,the weathering process,whether soil is transported or sedimentary,and how soil development occurred. Various characteristics of the soil such as soil composition,grain size,and aggregation determine the percolation and water-holding capacity of the soils. These characteristics along with parameters such as pH,mineral composition,and topography determine to a large extent the vegetation in any area. Temperature is an abiotic factor that influences the rate of biological processes and the distribution of organisms,but it does not directly determine the physical percolation or water-holding capacity of the soil itself.

(B) $P$. Thermoacidophiles are archaebacteria capable of surviving in extreme temperatures exceeding $100^{\circ}C$.
$Q$. The normal body temperature of a human is approximately $37^{\circ}C$.
$R$. Antarctic fish are adapted to survive in sub-zero temperatures (below $0^{\circ}C$) in polar waters.
Therefore, the correct matching is $(P-I), (Q-II), (R-III)$.

(A) Statement $A$ is correct: Even aquatic organisms face water-related challenges,such as osmotic balance,depending on the salinity of their environment.
Statement $B$ is correct: Euryhaline organisms are capable of tolerating a wide range of salinities.
Statement $C$ is correct: Stenohaline organisms are restricted to a narrow range of salinities.
Statement $D$ is correct: Freshwater animals are adapted to low salinity; if placed in sea water,they face severe osmotic stress due to water loss,which they cannot survive for long.
Statement $E$ is correct: The salinity levels provided are standard ecological measurements: $<5$ ppt for inland waters,$30-35$ ppt for the sea,and $>100$ ppt for hypersaline lagoons.
Since all statements $A, B, C, D,$ and $E$ are scientifically accurate,the correct option is that all are correct.

(A) The correct matches are as follows:
$i$. Eurythermal: Organisms that can tolerate a wide range of temperatures $(b)$.
$ii$. Stenothermal: Organisms that can tolerate only a narrow range of temperatures $(d)$.
$iii$. Euryhaline: Organisms that can tolerate a wide range of salinity $(c)$.
$iv$. Stenohaline: Organisms that can tolerate only a narrow range of salinity $(a)$.
Therefore,the correct matching is $i-b, ii-d, iii-c, iv-a$.

(A) Organisms are classified based on their ability to tolerate environmental conditions.
$1$. $Eurythermal$ organisms are those that can tolerate and thrive in a wide range of temperatures.
$2$. $Stenothermal$ organisms are those that are restricted to a narrow range of temperatures.
$3$. $Isothermal$ refers to a process or state where the temperature remains constant.
$4$. $Hydrothermal$ refers to the action of heated water,often associated with deep-sea vents.
Therefore,the correct term for an organism that can tolerate a wide range of temperature is $Eurythermal$.

(B) Based on the standard $NCERT$ diagram for biomes:
$A$ corresponds to Desert (low precipitation,variable temperature).
$B$ corresponds to Grassland (moderate precipitation,variable temperature).
$C$ corresponds to Tropical forest (high precipitation,high temperature).
$D$ corresponds to Temperate forest (moderate to high precipitation,moderate temperature).
$E$ corresponds to Coniferous forest (moderate precipitation,low temperature).
$F$ corresponds to Arctic and Alpine tundra (low precipitation,very low temperature).
Therefore,the correct sequence is $A-5, B-4, C-2, D-1, E-3, F-6$.