Special modes of nutrition Questions in English

(B) Mycorrhizae represent a symbiotic association between fungi and the roots of higher plants.
In this association,the fungal hyphae have a very large surface area,which helps in the absorption of essential nutrients,particularly phosphorus,from the soil.
The plant,in turn,provides carbohydrates and other organic nutrients to the fungi.
Therefore,the primary benefit to the plant is the enhanced absorption of nutrients from the soil.

(B) Mycorrhiza is a symbiotic association between a fungus and the roots of a higher plant. In this relationship,the fungus helps the plant in the absorption of water and minerals (especially phosphorus) from the soil,while the plant provides carbohydrates to the fungus. Therefore,the correct option is $B$.

(B) In mycorrhiza,the fungal hyphae form a symbiotic association with the roots of higher plants. In the case of ectomycorrhiza,the fungal hyphae form a mantle on the root surface and penetrate between the cells of the epidermis and the cortex,but they do not enter the cells themselves. Thus,they remain restricted to the root cortex.

(A) The symbiotic association between fungi and the roots of higher plants (tracheophytes) is called $Mycorrhiza$.
In this relationship,the fungus helps the plant in the absorption of water and minerals (especially phosphorus) from the soil,while the plant provides carbohydrates and other organic nutrients to the fungus.
This is a mutualistic relationship where both partners benefit.

(D) $Mycorrhiza$ is a symbiotic association between a fungus and the roots of higher plants. In this relationship,both organisms benefit: the fungus helps the plant in the absorption of water and minerals (especially phosphorus) from the soil,while the plant provides the fungus with carbohydrates and shelter. Therefore,it is a classic example of symbiosis (mutualism).

(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 the 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, $VAM$ represents symbiotic fungi.

(B) $Drosera$ is an insectivorous plant.
Insectivorous plants are autotrophic because they perform photosynthesis,but they are also heterotrophic because they capture insects to fulfill their nitrogen requirements in nitrogen-deficient soils.
Therefore,$Drosera$ exhibits heterotrophic nutrition.

(A) Insectivorous plants are considered $Heterotrophic$ because they derive nutrients,specifically nitrogen,by trapping and digesting insects.
Although they perform $Photosynthesis$ to produce carbohydrates,they grow in nitrogen-deficient soils,necessitating the consumption of insects to meet their nitrogen requirements.
Therefore,they exhibit a specialized form of heterotrophy.

(D) $Utricularia$ (bladderwort) is an insectivorous plant.
It possesses specialized structures called bladders to trap insects.
These bladders contain two types of glands:
$1$. External glands: These are $2$-celled and secrete mucilage and sugar to attract insects.
$2$. Internal glands: These are $4$-celled and secrete acidic digestive juices rich in proteases and $HCl$ to digest the trapped insects.
Therefore,the digestive glands responsible for secreting digestive juice are $4$-celled.

(A) $Pinguicula$ (butterwort) is an insectivorous plant. The upper surface of its leaves is covered with two types of glands:
$1$. Stalked mucilage glands: These secrete a sticky substance (mucilage) that traps small insects.
$2$. Sessile digestive glands: These secrete enzymes that digest the trapped insect to absorb nutrients.
When an insect lands on the leaf,it gets stuck in the mucilage,and the leaf margins curl inward to facilitate digestion.

(A) Mycorrhiza is a symbiotic association between a fungus and the roots of higher plants.
In this association,the fungal hyphae have a very large surface area that helps in the absorption of water and mineral salts from the soil,which are then provided to the plant.
In return,the plant provides the fungus with sugars and other organic nutrients.
Therefore,the correct option is $A$.

(B) Plants that cannot synthesize their own food,either entirely or partially,are known as $Heterophytes$ or heterotrophic plants.
These plants depend on external sources for organic and inorganic substances to meet their nutritional requirements.
Examples include non-green plants like parasitic plants (e.g.,$Cuscuta$) and saprophytic plants,which obtain nutrients from other living organisms or decaying organic matter.

(A) Plants that grow on other plants but do not derive nutrients from them are called $Epiphytes$.
They use the host plant only for physical support to reach sunlight.
They do not have any contact with the soil and obtain moisture and nutrients from the atmosphere and rain.
Therefore,the correct option is $A$.

(D) Partial parasites possess chlorophyll and are capable of performing photosynthesis to synthesize their own organic food. However,they lack a developed root system to absorb water and essential nutrients from the soil. Therefore,they rely on their host plants to obtain water and minerals. $A$ classic example of a partial parasite is $Viscum$ (mistletoe).

(A) Insectivorous plants typically inhabit waterlogged and swampy soils that are deficient in nitrogen compounds.
To compensate for this lack of nitrogen,these plants have evolved specialized leaves that trap and digest insects and other small animals,allowing them to absorb the necessary nitrogen for their growth and survival.

(B) $Viscum$ (commonly known as mistletoe) is a hemiparasite or partial stem parasite.
It possesses chlorophyll and can perform photosynthesis to produce its own food.
However,it derives water and mineral nutrients from the host plant's xylem by attaching itself to the host's stem using specialized structures called haustoria.
Therefore,it is classified as a partial stem parasite.

(C) $Drosera$ is an insectivorous plant. Its leaves possess numerous glandular hairs known as tentacles. These tentacles secrete a sticky,shining,mucilaginous fluid that attracts insects. When an insect lands on the leaf,it gets trapped in this sticky secretion,allowing the plant to digest it to obtain nitrogen.

(A) $Orobanche$ is a total root parasite that typically infects the roots of plants like brinjal and tobacco.
$Balanophora$ is also classified as a total root parasite that derives its nutrition from the roots of forest trees.
Therefore,both are examples of total root parasites.

(B) $Loranthus$ is a partial stem parasite.
It is a hemiparasite that grows on the branches of host trees such as $Acacia$,$Mango$,$Dalbergia$,and $Albizzia$.
It possesses chlorophyll and can perform photosynthesis,but it derives water and mineral nutrients from the host plant's xylem.

(D) Insectivorous plants are those that derive some or most of their nutrients from trapping and consuming insects and other arthropods.
$Drosera$,commonly known as the sundew,is a well-known genus of insectivorous plants.
$Balanophora$ and $Orobanche$ are parasitic plants,while $Rafflesia$ is a holoparasitic plant.
Therefore,the correct option is $D$.

(B) $Drosera$ and $Sarracenia$ are examples of carnivorous plants.
These plants grow in nitrogen-deficient soils.
To meet their nitrogen requirements,they trap and digest insects,which provides them with the necessary nitrogenous compounds.

(C) $Drosera$ plants are partly heterotrophic. These plants grow in nitrogen-deficient soils and obtain their nitrogen by trapping and digesting small insects. Therefore,they are classified as insectivorous plants.

(B) heterotrophic plant that obtains its food from another living organism (the host) without killing it is called a parasite.
The parasite extracts nutrients from the host using specialized absorbing organs known as haustoria.
These haustoria penetrate the host's tissues to reach the vascular system,allowing the parasite to draw water and nutrients.

(D) Carnivorous plants,such as $Nepenthes$ or $Drosera$,typically grow in marshy or boggy soils that are acidic and deficient in nitrogen. To compensate for this lack of nitrogen in the soil,these plants have evolved to capture and digest insects. The proteins from the insect bodies are broken down into amino acids,which provide the necessary nitrogen for the plant's growth and development.

(A) $Nepenthes$ (pitcher plant) is a green plant capable of photosynthesis,which makes it a producer.
However,it grows in nitrogen-deficient soil and traps insects to fulfill its nitrogen requirements,exhibiting a carnivorous mode of nutrition.
Therefore,it acts as both a producer and a primary carnivore.

(B) An $Endophyte$ is an organism,often a bacterium or fungus,but sometimes a plant,that lives within a plant for at least part of its life cycle without causing apparent disease. These organisms often exist in a symbiotic relationship with the host plant,providing benefits such as enhanced growth or protection against pathogens.

(B) $Dionaea$ (Venus flytrap),$Drosera$ (Sundew),and $Pinguicula$ (Butterwort) are all well-known insectivorous plants that trap insects to supplement their nitrogen requirements.
$Dischidia$ is an epiphytic plant that grows on trees. It is not insectivorous; instead,it often forms a symbiotic relationship with ants,where the ants live inside its modified pitcher-like leaves,providing nutrients to the plant in exchange for shelter.

(B) $Cuscuta$ (commonly known as dodder) is a total stem parasite. It lacks chlorophyll and cannot perform photosynthesis,so it derives its nutrition from the host plant using specialized structures called haustoria.
$Drosera$ (sundew),$Nepenthes$ (pitcher plant),and $Utricularia$ (bladderwort) are insectivorous plants that trap insects to fulfill their nitrogen requirements,but they are autotrophic as they possess chlorophyll.

(D) The correct answer is $D$.
$Utricularia$,commonly known as the bladderwort,is an insectivorous plant.
In this plant,portions of the leaves are modified into sac-like structures called bladders.
These bladders act as traps to capture small aquatic insects and microorganisms,which the plant digests to obtain nitrogenous nutrients in nitrogen-deficient environments.

(A) $Dionaea \ muscipula$ is the scientific name of the Venus fly trap.
It is a carnivorous plant that captures insects using a snap-trap mechanism formed by its modified leaves.
Therefore,the correct option is $A$.

(C) $Sarracenia$ is a well-known genus of pitcher plants.
In these plants,the leaves are modified into pitcher-like structures to trap insects.
Unlike some other carnivorous plants,the pitchers of $Sarracenia$ do not secrete their own digestive enzymes; instead,they rely on symbiotic bacteria to decompose the trapped insects and release nutrients for the plant.

(B) The Pitcher plant $(Nepenthes)$ is a green plant that performs photosynthesis to produce its own food,making it autotrophic.
However,it grows in nitrogen-deficient soil.
To compensate for this nitrogen deficiency,it traps and digests small insects.
Due to this unique mode of nutrition,it is classified as a carnivorous plant.

(A) Insectivorous plants,such as $Drosera$ and $Nepenthes$,typically grow in soil that is deficient in nitrogen.
To compensate for this lack of nitrogen in the soil,these plants have evolved to trap and digest insects.
The proteins from the insect bodies are broken down by enzymes,allowing the plants to absorb the necessary nitrogen compounds for their growth and development.

(B) $Aldrovanda$ (water flea trap) is an aquatic,free-floating,rootless,insectivorous plant. It possesses leaves that are similar to those of $Dionaea$ (Venus flytrap) and is specifically adapted to capture small aquatic organisms like water fleas.

(B) $Dischidia$ is a genus of plants where the pitcher-like structures are modified leaves that lack a lid. These pitchers are primarily used for storing rainwater and debris,which provides nutrients and moisture to the plant.

(C) Mycorrhiza is a symbiotic,mutually beneficial association between fungi and the roots of higher plants. In this relationship,the fungal hyphae help the plant in the absorption of essential nutrients like phosphorus from the soil,while the plant provides the fungus with carbohydrates and a protected environment.

(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 nutrients,especially phosphorus,from the soil,and in return,the plant provides carbohydrates to the fungus.
Therefore,$VAM$ represents symbiotic fungi.

(B) $VAM$ (Vesicular-Arbuscular Mycorrhiza) is a type of symbiotic association between fungi and plant roots. The fungal hyphae absorb phosphorus from the soil and pass it to the plant,playing a significant role in the phosphate nutrition of plants.

(B) Mycorrhiza is a symbiotic association between a fungus and the roots of higher plants.
In this association,the fungal hyphae absorb essential nutrients,particularly phosphorus,from the soil and provide them to the plant.
In return,the plant provides the fungus with carbohydrates and a protected environment.
Therefore,it is primarily helpful in the absorption of nutrients from the soil.

(A) Insectivorous plants are autotrophic in their mode of nutrition,meaning they can perform photosynthesis.
However,they typically grow in marshy or boggy soils that are severely deficient in nitrogen.
To compensate for this lack of nitrogen in the soil,these plants have evolved to trap and digest insects,which serve as a supplemental source of nitrogen.

(C) $Mycorrhiza$ is a mutualistic association between fungi and the roots of higher plants.
In this relationship, both organisms derive benefits from each other.
The fungi help the plant in the absorption of essential nutrients like phosphorus from the soil, while the plant provides carbohydrates and shelter to the fungi.
Since both partners benefit from this interaction, it is classified as a symbiotic relationship (mutualism).

(C) $Nepenthes$ is a chlorophyll-containing plant,so it synthesizes food by the process of photosynthesis; thus,it is a primary producer.
Because it is an insectivorous plant,it consumes insects like grasshoppers and other small insects,so it is also a consumer.

(B) In a symbiotic relationship known as mycorrhiza,fungi associate with the root systems of higher plants.
Plants provide the fungi with organic nutrients,primarily sugars (carbohydrates) produced through photosynthesis.
In exchange,the fungal hyphae increase the surface area for the absorption of water and mineral nutrients (like phosphorus) from the soil for the plant.
Therefore,the correct answer is sugars.

(B) Mycorrhiza is a symbiotic association between the roots of higher plants and fungi.
In this relationship,the fungus helps the plant in the absorption of essential nutrients,particularly phosphorus,from the soil.
In return,the plant provides the fungus with carbohydrates and other organic nutrients produced through photosynthesis.
This association is mutually beneficial for both organisms.

(B) $Drosera$ (sundew) is an insectivorous plant. Although it is photosynthetic and can produce its own carbohydrates,it grows in soil that is deficient in nitrogen $(N_2)$. To compensate for this lack of nitrogen,it traps and digests insects to obtain the necessary nitrogenous compounds for its growth and development.

(C) The common names correspond to the following scientific names:
$1$. Bladderwort is the common name for $Utricularia$.
$2$. Sundew is the common name for $Drosera$.
$3$. Venus flytrap is the common name for $Dionaea$.
Therefore,the correct sequence is $Utricularia, Drosera, Dionaea$.

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

(A) Insectivorous plants,such as $Nepenthes$ (pitcher plant) or $Drosera$ (sundew),typically grow in marshy or boggy areas where the soil is acidic and lacks essential nutrients,particularly nitrogen.
To compensate for this deficiency,these plants have evolved to trap and digest insects,which serve as a supplemental source of nitrogen for their growth and development.

(B) Insectivorous plants,such as $Nepenthes$ (pitcher plant) or $Drosera$ (sundew),typically grow in swampy or boggy areas where the soil is acidic and lacks essential nutrients,particularly nitrogen.
To compensate for this deficiency,these plants have evolved specialized leaves to trap and digest insects.
The proteins from the insect bodies are broken down into amino acids,which provide the necessary nitrogen for the plant's growth and development.

(D) Insectivorous plants are specialized plants that derive some or most of their nutrients from trapping and consuming insects and other arthropods.
$1$. Bladderwort $(Utricularia)$ is a well-known aquatic insectivorous plant.
$2$. Venus flytrap $(Dionaea muscipula)$ is a terrestrial insectivorous plant.
$3$. Cuscuta is a parasitic plant,not an insectivorous one.
Therefore,both Bladderwort and Venus flytrap are examples of insectivorous plants.