Special modes of nutrition Questions in English

(B) $VAM$ stands for Vesicular-Arbuscular Mycorrhiza.
It is a type of mycorrhiza in which the fungus penetrates the cortical cells of the roots of a vascular plant.
These fungi form a symbiotic association with plant roots, where the fungus helps in the absorption of phosphorus and other nutrients from the soil, while the plant provides carbohydrates to the fungus.
Therefore, $VAM$ is a symbiotic fungus.

(C) Mycorrhiza is a symbiotic association between a fungus and the roots of higher plants. The fungal hyphae form a network around the root or penetrate the root cells. These hyphae increase the surface area for the absorption of water and minerals (especially phosphorus) from the soil,effectively acting as root hairs,especially in nutrient-poor or adverse soil conditions.

(B) Mycorrhiza is a symbiotic association between a fungus and the roots of higher plants.
In this association,the fungal symbiont absorbs phosphorus from the soil and passes it to the plant.
In return,the plant provides the fungus with carbohydrates and a protected environment.
Therefore,the correct answer is Phosphorus.

(C) Mycorrhiza is a symbiotic association between a fungus and the roots of higher plants. In this relationship,the fungal hyphae absorb phosphorus from the soil and pass it to the plant,while the plant provides the fungus with carbohydrates and shelter. This association is a classic example of mutualism,where both partners benefit.

(A) $VAM$ stands for Vesicular-Arbuscular Mycorrhiza. It is a type of symbiotic association between certain fungi and plant roots. These fungi help the plant in the absorption of nutrients,especially phosphorus,from the soil. Therefore,$VAM$ is primarily useful for phosphate nutrition in plants.

(A) Mycorrhiza is a symbiotic association between a fungus and the roots of higher plants. The fungal hyphae absorb essential nutrients,particularly phosphorus,from the soil and pass them to the plant. In return,the plant provides the fungus with carbohydrates. Therefore,the primary function of mycorrhiza is the absorption of nutrients from the soil.

(D) Insectivorous plants,such as $Nepenthes$ (pitcher plant) and $Drosera$ (sundew),typically grow in swampy or boggy areas where the soil is acidic and deficient in nitrogen $(N)$.
To compensate for this lack of nitrogen,these plants have evolved to trap and digest insects,which provide the necessary nitrogenous compounds for their growth and development.

(C) Nepenthes is a green plant that performs photosynthesis,making it a producer.
However,it also traps insects to supplement its nitrogen requirements in nutrient-poor soils,which classifies it as a consumer (carnivore) as well.
Therefore,it acts as both a producer and a consumer in the ecosystem.

(A) $Cuscuta$ (commonly known as dodder) is a parasitic plant.
It lacks chlorophyll and cannot perform photosynthesis.
It derives its nutrition by developing haustoria,which penetrate the host plant's tissues to absorb water and nutrients.
Therefore,it is classified as a parasitic plant.

(A) $VAM$ stands for $Vesicular-Arbuscular Mycorrhiza$. It is a type of symbiotic association between certain fungi and plant roots. The fungal hyphae penetrate the root cortex and help the plant in the absorption of nutrients,especially phosphorus,from the soil. Therefore,$VAM$ is primarily useful for phosphate nutrition in plants.

(A) Mycorrhiza is a symbiotic association between a fungus and the roots of higher plants. The fungal hyphae have a very large surface area,which helps in the absorption of inorganic nutrients,particularly phosphorus,from the soil. This increased nutrient uptake directly stimulates the growth of the plant.

(A) Mycorrhiza is a symbiotic association between a fungus and the roots of higher plants. The fungal hyphae absorb essential nutrients like phosphorus from the soil and transfer them to the plant,while the plant provides carbohydrates to the fungus. Thus,the primary function of mycorrhiza is the absorption of nutrients from the soil.

(D) Mycorrhiza is a symbiotic association between a fungus and the roots of higher plants.
$1$. The fungal hyphae absorb phosphorus from the soil and pass it to the plant,which is a primary function.
$2$. They provide resistance to root-borne pathogens.
$3$. They also provide tolerance to salinity and drought.
$4$. They do not fix phosphorus into organic form in the soil; rather,they facilitate the uptake of inorganic phosphorus $(PO_4^{3-})$ from the soil into the plant roots. Therefore,option $D$ is the correct answer.

(D) Mycorrhiza is a symbiotic association between a fungus and the roots of higher plants. The fungal symbiont in these associations absorbs phosphorus from the soil and passes it to the plant. This association also provides other benefits such as resistance to root-borne pathogens,tolerance to salinity and drought,and an overall increase in plant growth and development.

(C) Mycorrhiza is a symbiotic association between a fungus and the roots of higher plants.
In this association,the fungal hyphae absorb phosphorus from the soil and pass it to the plant,while the plant provides the fungus with carbohydrates and shelter.
Therefore,it is a symbiotic relationship between fungi and plants.

(A) Mycorrhiza is a symbiotic association between a fungus and the roots of higher plants. The fungal symbiont in these associations absorbs phosphorus from the soil and passes it to the plant. This helps the plant in growth and development,especially in phosphorus-deficient soils.

(B) $Mycorrhiza$ is a symbiotic association between a fungus and the roots of higher plants. The fungal hyphae absorb essential nutrients,particularly phosphorus,from the soil and transfer them to the plant. In return,the plant provides the fungus with carbohydrates and other organic nutrients. Therefore,the correct answer is phosphorus.

(B) Mycorrhiza is a symbiotic association between a fungus and the root system of higher plants.
In this association,the fungal hyphae absorb minerals and water from the soil and provide them to the plant,while the plant provides sugars and nitrogenous compounds to the fungus.
Lichens represent a symbiotic association between algae and fungi,not involving a root system.
Therefore,the correct answer is Mycorrhiza.

(A) $Cuscuta$ is a well-known parasitic plant that lacks chlorophyll and derives its nutrition from the host plant using specialized structures called haustoria.
$Mango$ and $Neem$ are autotrophic trees.
$Bladderwort$ is an insectivorous plant.

(A) Mycorrhiza is a symbiotic association between a fungus and the roots of higher plants.
In this relationship,the fungus helps the plant in the absorption of essential nutrients like phosphorus from the soil,while the plant provides carbohydrates (food) to the fungus.
Since both organisms benefit from this association,it is classified as a symbiotic relationship (mutualism).

(B) Insectivorous plants are plants that derive some or most of their nutrients from trapping and consuming animals or protozoans,typically insects and other arthropods.
Common examples include $Nepenthes$ (Pitcher plant),$Utricularia$ (Bladderwort),and $Dionaea$ (Venus flytrap).
$Trapa$ is an aquatic plant,and $Vanda$ is an epiphytic orchid; neither of these are insectivorous.
$Cholera$ is a bacterial disease,not a plant.
Therefore,the correct set of insectivorous plants is $Nepenthes$,$Utricularia$,and $Dionaea$.

(D) The correct answer is $D$.
$Glomus$ is a genus of arbuscular mycorrhizal fungi.
These fungi form a symbiotic association with plant roots.
The fungal hyphae penetrate the root cells and extend into the soil,significantly increasing the surface area for the absorption of nutrients,especially phosphorus,from the soil.
$Rhizobium$ and $Frankia$ are involved in nitrogen fixation,while $Anabaena$ is a cyanobacterium also involved in nitrogen fixation.

(A) Insectivorous plants are plants that derive some or most of their nutrients from trapping and consuming animals or protozoans,typically insects and other arthropods.
$A$. Pitcher plant $(Nepenthes)$,Venus flytrap $(Dionaea)$,and Drosera $(Sundew)$ are all well-known examples of insectivorous plants.
$B$. Calotropis and Orchid are not insectivorous.
$C$. Calotropis is not insectivorous.
$D$. Trapa (water chestnut) and Orchid are not insectivorous.
Therefore,the correct set is Pitcher plant,Venus flytrap,and Drosera.

(D) The Assertion is incorrect because insectivorous plants grow in nitrogen-deficient soils,not oxygen-deficient environments. They trap insects to fulfill their nitrogen requirements.
The Reason is correct because these plants possess chlorophyll and perform photosynthesis (autotrophic),but they also consume insects to obtain essential nutrients like nitrogen (heterotrophic).
Therefore,the Assertion is incorrect,but the Reason is correct.

(N/A) Mycorrhiza is a symbiotic association of fungi with the root systems of some plants.
The fungal hyphae form a dense network around the young roots or penetrate the root cells.
The large surface area of the fungal hyphae significantly increases the absorption of water and minerals from the soil.
In return,the fungi receive sugar and nitrogenous compounds from the host plants.
This association is often obligate; for example,$Pinus$ seeds cannot germinate or establish themselves in the absence of mycorrhiza.

(A) $Mycorrhiza$ is a symbiotic association between a fungus and the roots of higher plants.
In this relationship,the fungal hyphae absorb phosphorus from the soil and pass it to the plant,while the plant provides the fungus with carbohydrates and shelter.
This association is a classic example of mutualism,where both organisms benefit from the interaction.

(N/A) The pitcher plant $(Nepenthes)$ is considered a producer because it contains chlorophyll and performs photosynthesis to synthesize its own organic food from inorganic raw materials using sunlight as an energy source.
Although it is an insectivorous plant,it is not a consumer in the traditional sense regarding its carbon source. It grows in nitrogen-deficient soil and traps insects primarily to fulfill its nitrogen requirements,not to obtain energy or carbon. Since it produces its own carbohydrates through photosynthesis,it is classified as a producer.

(B) $\Rightarrow$ Mycorrhiza is a symbiotic association of a fungus with a root system.
$\Rightarrow$ The fungal filaments form a network around the young root or they penetrate the root cells. The hyphae have a very large surface area that absorbs mineral ions and water from the soil from a much larger volume of soil than a root alone could achieve.
$\Rightarrow$ The fungus provides minerals and water to the roots; in turn,the roots provide sugars and $N$-containing compounds to the mycorrhizae.

(B) Mycorrhiza represents a symbiotic association between a fungus and the roots of higher plants.
The fungal hyphae form a network around the young root or they penetrate the root cells.
The hyphae have a very large surface area that can absorb mineral ions and water from the soil much more efficiently than the roots alone.
In this association,the fungus provides minerals and water to the roots,while the roots,in turn,provide sugars and nitrogen-containing compounds to the fungus.

(N/A) Carnivorous (insectivorous) plants typically grow in soil that is deficient in nitrogen.
To compensate for this nitrogen deficiency,their leaves are modified into specialized structures,such as pitchers or traps.
These structures contain proteolytic enzymes that break down the captured insects.
By digesting the insects,the plants absorb the necessary nitrogen compounds to support their growth.
An example of such a plant is $Nepenthes$ (Pitcher plant).

(B) Mycorrhiza is a symbiotic association between a fungus and the roots of higher plants.
In this association,the fungal hyphae form a network that increases the surface area for the absorption of water and mineral nutrients (especially phosphorus) from the soil,which are then provided to the plant.
In return,the plant provides the fungus with organic nutrients,such as sugars (glucose and sucrose) and amino acids,which are products of photosynthesis.

(B) $\Rightarrow$ Carnivorous plants like $Nepenthes$ (pitcher plant) and Venus fly trap grow in soil that is deficient in nitrogen.
$\Rightarrow$ To compensate for this deficiency,these plants trap and digest insects.
$\Rightarrow$ By digesting the proteins present in the bodies of these insects,they obtain the essential nitrogen required for their growth and development.

(N/A) Plants that lack chlorophyll are heterotrophic in nature and cannot perform photosynthesis.
They obtain their nutrition from other sources such as decaying organic matter (saprophytes) or by parasitizing other living plants (parasites).
An example of such a plant is $Monotropa$ (also known as the ghost plant or Indian pipe),which is a myco-heterotroph that obtains nutrients from fungi associated with the roots of other plants.

(B) $\Rightarrow$ Mycorrhiza is a symbiotic association between a fungus and the roots of higher plants.
The fungus makes available water and minerals and provides protection against pathogens to the root of the higher plant.
In return,the root of the higher plant provides food (carbohydrates) and shelter to the fungi.

(C) Insectivorous plants (e.g., $Nepenthes$, $Drosera$) are green plants that possess chlorophyll and are capable of performing photosynthesis to produce their own food. Therefore, they are classified as $Producers$. However, they grow in nitrogen-deficient soils and consume insects to fulfill their nitrogen requirements, which makes them $Carnivores$ as well. Thus, they exhibit both characteristics.

(B) Mycorrhizae represent a symbiotic association between fungi and the roots of higher plants,such as in the roots of $Pinus$.
In this association,the plant provides the fungus with carbohydrates (food).
In return,the fungal hyphae increase the surface area for the absorption of water and essential mineral nutrients,particularly phosphorus,from the soil.

(A) Bladderwort and Venus fly trap are partially autotrophic plants. They trap insects to fulfill their nitrogen requirements,as they grow in nitrogen-deficient soil. Therefore,they are classified as insectivorous plants. Other examples include the pitcher plant.

(A) Mycorrhiza is a symbiotic association between a fungus and the roots of higher plants. The fungal filaments (hyphae) have a very large surface area and extend far into the soil,which significantly increases the efficiency of water and mineral absorption for the plant.

(A) Insectivorous plants grow in soil that is deficient in nitrogen,specifically in the form of nitrates.
Nitrogen is an essential element for the synthesis of proteins,nucleic acids,and other metabolic compounds.
To compensate for this deficiency,these plants have evolved to trap and digest insects to obtain the necessary nitrogen.
An example of such a plant is $Nepenthes$ (pitcher plant).

(A) The plant $Nepenthes$ is commonly known as the pitcher plant. It is a carnivorous plant that grows in nitrogen-deficient soil. Other examples include: $Drosera$ (sundew),$Dionaea$ (Venus flytrap),$Aldrovanda$ (waterwheel plant),$Utricularia$ (bladderwort),$Sarracenia$ (trumpet pitcher),and $Pinguicula$ (butterwort).

(A) An insectivorous angiosperm is a plant that derives some or most of its nutrients from trapping and consuming insects.
Common examples include:
$(i)$ $Utricularia$ (Bladderwort)
$(ii)$ $Nepenthes$ (Pitcher plant)
$(iii)$ $Drosera$ (Sundew)
$(iv)$ $Dionaea$ (Venus flytrap)

(B) $\Rightarrow$ $Nepenthes$ (Pitcher plant),$Utricularia$ (Bladderwort),and $Drosera$ (Sundew) are all examples of insectivorous plants.
They grow in nitrogen-deficient soils and obtain nitrogen by trapping and digesting insects.
They secrete proteolytic enzymes to break down the proteins of the captured insects,thereby fulfilling their nitrogen requirements.

(B) The symbiotic association between fungi and the roots of higher plants is known as $Mycorrhiza$.
In this mutualistic relationship,the fungi help the plant in the absorption of essential nutrients like phosphorus from the soil,while the plant provides carbohydrates to the fungi.
Lichens represent a symbiotic association between algae and fungi,not roots and fungi.

(A) Mycorrhiza is a symbiotic association between the roots of higher plants and fungal hyphae.
In this association,the fungi help the plant in the absorption of essential nutrients like phosphorus from the soil,while the plant provides the fungi with carbohydrates and shelter.
This is a classic example of mutualism where both partners benefit.

(C) Drosera,commonly known as the sundew,is an insectivorous plant.
It possesses specialized glandular trichomes (tentacles) on its leaves.
These trichomes perform two main functions:
$1$. They secrete a sticky,mucilaginous substance that helps in trapping insects.
$2$. They secrete digestive enzymes to digest the trapped prey,allowing the plant to obtain nitrogen in nutrient-poor environments.
Therefore,the primary function of these glandular trichomes is secretory and to trap insects.

(C) Mycorrhiza is a symbiotic association between the roots of higher plants and fungi. In this relationship,the fungi help the plant in the absorption of water and minerals (especially phosphorus) from the soil,while the plant provides carbohydrates and shelter to the fungi.

(C) Statement $I$ is correct because arbuscular mycorrhizal fungi $(AMF)$,a type of endomycorrhiza,penetrate the cortical cells of plant roots to form specialized branched structures called arbuscules.
Statement $II$ is incorrect because arbuscules are formed intracellularly (inside the cell),not intercellularly (between the cells),within the cortical cells of the root to facilitate nutrient exchange.

(B) Mycorrhiza is a symbiotic association between a fungus and the roots of higher plants.
In this association,the fungus helps the plant in the absorption of essential nutrients like phosphorus from the soil,while the plant provides carbohydrates to the fungus.
Therefore,it is not a single organism like an alga,bacterium,or virus,but a mutualistic relationship involving fungi.