Excretory organs of different organism Questions in English

(C) $Amoeba$ is a unicellular organism that lacks a specialized excretory system.
Excretion of metabolic waste products occurs primarily through the cell membrane,known as the plasmalemma,via the process of simple diffusion.
While the contractile vacuole is involved in osmoregulation (water balance),the primary route for the excretion of nitrogenous waste is the plasmalemma.

(A) The excretory system of some arthropods,specifically crustaceans,consists of green glands and maxillary glands.
These green glands are responsible for removing harmful nitrogenous waste substances from the blood,thus performing the function of excretion.

(B) The kidneys in fishes and amphibians are of the $Mesonephros$ type.
$Pronephros$ is the most primitive type of kidney found in the embryonic stages of higher vertebrates and in some primitive fishes like hagfish.
$Metanephros$ is the advanced type of kidney found in reptiles,birds,and mammals.
Therefore,the correct answer is $Mesonephros$.

(A) The functional kidney of a frog tadpole is the pronephros (also known as the head kidney).
It develops from the nephrostomes located in the anterior region of the embryo.
As the tadpole undergoes metamorphosis into an adult frog,the pronephros is replaced by the mesonephros.

(D) Metanephric kidneys are the most advanced type of kidneys found in adult amniotes,which include $Reptilia$,$Aves$ (Birds),and $Mammalia$ (Mammals). These kidneys develop from the posterior part of the nephrogenic cord and are characterized by the presence of a ureter for the drainage of urine.

(A) When a marine fish is placed in fresh water,the concentration of solutes in the surrounding fresh water is much lower than the concentration of solutes in the fish's body fluids (cytoplasm).
Due to this concentration gradient,water molecules move from the surrounding environment into the fish's cells through the process of endosmosis.
This influx of water causes the cells to swell and eventually burst,leading to the death of the fish.

(D) . In crustaceans,the antennary gland or green gland is the primary excretory organ that eliminates ammonia from the animal body.

(B) The correct answer is $B$. The contractile vacuole in $Amoeba$ performs the function of osmoregulation,which is the maintenance of water balance within the cell. Similarly,the human kidney is the primary organ responsible for osmoregulation and excretion in the human body. Therefore,both structures serve a similar physiological role in maintaining homeostasis.

(C) The nephrostomes are ciliated,funnel-like structures that serve as the internal openings of the excretory system in certain organisms.
In the larval stage of frogs,known as the tadpole,the kidneys are of the pronephric type,which possess functional nephrostomes that open into the coelom to collect waste.
As the tadpole undergoes metamorphosis into an adult frog,the pronephric kidneys are replaced by mesonephric kidneys,which lack these nephrostomes.
Therefore,nephrostomes are functional in the tadpole stage.

(D) The urinary bladder is a sac-like organ that stores urine before it is excreted from the body.
In many reptiles,such as snakes and certain lizards (like some species of the suborder $Lacertilia$),the urinary bladder is absent.
Crocodiles also lack a urinary bladder.
Therefore,the urinary bladder is absent in all the organisms mentioned in the options.
Thus,the correct answer is $D$.

(A) The contractile vacuole is a specialized organelle found in protozoans (like Amoeba) that functions primarily in osmoregulation by collecting and expelling excess water from the cell.
Similarly,one of the primary functions of the kidneys in higher animals is the regulation of water balance (osmoregulation) by excreting excess water from the body.
Therefore,both structures share the common function of maintaining water homeostasis.

(D) Kidneys are the primary excretory organs in all vertebrates.
While the complexity and efficiency of the kidney vary across different classes (such as pronephric,mesonephric,and metanephric kidneys),the fundamental function of filtration and excretion of nitrogenous wastes is performed by kidneys in all vertebrates,including fish,amphibians,reptiles,birds,and mammals.

(D) . Solenocytes,also known as flame cells,are specialized excretory cells found in flatworms $(Platyhelminthes)$. They function primarily in osmoregulation and excretion by filtering waste products from the body fluids.

(A) The correct matching is as follows:
$A$. Nephridia are the excretory organs found in annelids like Leech $(q)$.
$B$. Malpighian tubules are the excretory organs found in insects like Cockroach $(t)$.
$C$. Protonephridia (flame cells) are the excretory structures found in Platyhelminthes like flatworms (often represented by round worms in simplified contexts,though technically distinct,$s$ is the intended match here).
$D$. Kidneys are the complex excretory organs found in vertebrates like Shark $(r)$.
Thus,the correct combination is $A-q, B-t, C-s, D-r$.

(A) Fresh water bony fishes live in a medium that is hypotonic to their body fluids,causing water to constantly enter their bodies through osmosis,primarily across the gills.
To maintain osmotic balance and prevent water overload,these fishes excrete large volumes of highly dilute or hypotonic urine.
Therefore,the correct mechanism is excreting a hypotonic urine.

(A) The loop of Henle is a characteristic feature of the nephrons in mammals and birds,which allows for the concentration of urine.
In amphibians like frogs,the nephrons lack a loop of Henle.
Therefore,frogs cannot produce hypertonic (concentrated) urine compared to their blood plasma.
Thus,the correct option is $A$.

(A) In crustaceans like prawns,the primary excretory organs are known as green glands or antennary glands.
These glands are located in the head region and are responsible for the filtration of hemolymph and the excretion of nitrogenous wastes.
Malpighian tubules are found in insects,kidneys are the primary excretory organs in vertebrates,and nephridia are found in annelids like earthworms.
Therefore,the correct option is $A$.

(A) Freshwater bony fishes live in a medium that is hypotonic to their body fluids. Consequently,water tends to enter their bodies through osmosis,primarily across the gills. To maintain osmotic balance,these fishes:
$1$. Excrete large volumes of very dilute (hypotonic) urine to remove excess water.
$2$. Actively absorb salts from the surrounding water through their gills to compensate for salt loss.
$3$. They do not drink water,as they already have an excess of it.
Therefore,the correct mechanism for maintaining water balance is the excretion of hypotonic urine.

(D) Coxal glands are specialized excretory organs found in certain arthropods,specifically in the class Arachnida.
Scorpions belong to the class Arachnida and possess coxal glands located at the base of their walking legs.
Crayfish typically use antennal glands (green glands) for excretion.
Silverfish are insects and use Malpighian tubules.
Jellyfish are cnidarians and do not have specialized excretory organs; they excrete waste via diffusion through their body surface.
Therefore,the correct answer is $D$ (Scorpion).

(B) $1$. In cockroach $(Periplaneta \text{ } americana)$, excretion is performed by Malpighian tubules.
$2$. In earthworm $(Pheretima \text{ } posthuma)$, excretion is performed by segmentally arranged tubular structures called nephridia.
$3$. In rabbit $(Oryctolagus \text{ } cuniculus)$, excretion is performed by a pair of kidneys.
Therefore, the correct sequence is Malpighian tubules, Nephridia, and Kidneys.

(A) In flatworms (Phylum Platyhelminthes),such as $Taenia$ (tapeworm),the specialized cells used for excretion and osmoregulation are known as flame cells or protonephridia.
Flame cells function by filtering metabolic waste from the body fluids and propelling it through the excretory duct system to the outside environment.
Therefore,the correct option is $A$.

(B) The renal portal system is a venous system that carries blood from the posterior part of the body directly to the kidneys before it returns to the heart.
In many vertebrates,such as amphibians,reptiles,and birds,this system ensures that blood from the hind limbs and tail region passes through the renal capillaries.
This allows the kidneys to filter nitrogenous waste products directly from this blood,thereby assisting in the excretion process.
Therefore,the primary significance of the renal portal system is to facilitate the removal of nitrogenous waste by the kidneys.

(D) The question asks for an invertebrate that excretes through kidneys.
$1$. King crab (Limulus) is an arthropod that excretes via coxal glands.
$2$. Frog is a vertebrate (Amphibian) that excretes via kidneys.
$3$. Lizard is a vertebrate (Reptile) that excretes via kidneys.
$4$. Octopus is a mollusc (invertebrate) that possesses kidneys (nephridia) for excretion.
Therefore,the correct answer is Octopus.

(D) The correct matching is as follows:
$(a)$ Platyhelminthes: Excretion occurs through flame cells (protonephridia). Thus, $(a-ii)$.
$(b)$ Aschelminthes: Excretion occurs through an excretory tube (renette cells). Thus, $(b-iv)$.
$(c)$ Protozoa: Excretion occurs through contractile vacuoles. Thus, $(c-v)$.
$(d)$ Arthropoda: Excretion occurs through green glands (antennary glands) in crustaceans. Thus, $(d-iii)$.
$(e)$ Mammalia: Excretion occurs through kidneys. Thus, $(e-i)$.
Therefore, the correct sequence is $(a-ii), (b-iv), (c-v), (d-iii), (e-i)$, which corresponds to option $D$.

(D) $1$. In $Paramecium$,the contractile vacuole is primarily involved in osmoregulation (water balance) rather than excretion of nitrogenous wastes. Excretion in $Paramecium$ occurs mainly through the general body surface by diffusion.
$2$. In $Planaria$ (a flatworm),specialized cells called flame cells (protonephridia) are responsible for osmoregulation and excretion.
$3$. Therefore,the statement $S$ is false because the primary function of the contractile vacuole is osmoregulation,not excretion. The statement $R$ is true as flame cells are indeed the excretory structures in $Planaria$.

(C) Crustaceans,such as prawns and crabs,belong to the phylum $Arthropoda$.
Their primary excretory organs are known as $Green$ $glands$ or $Antennary$ $glands$.
$Nephridia$ are found in $Annelida$,$Malpighian$ $tubules$ are found in $Insects$,and $Flame$ $cells$ are found in $Platyhelminthes$.

(A) The green gland,also known as the antennal gland,is the specialized excretory organ found in crustaceans like $Prawn$ (crustacean arthropods).
It functions to filter waste products from the hemolymph and maintain osmotic balance.
In contrast,butterflies use Malpighian tubules,snails use kidneys (metanephridia),and earthworms use nephridia for excretion.

(D) Excretion is the process of removing metabolic wastes from the body.
$A$. Flame cells (protonephridia) are the excretory structures found in Platyhelminthes (e.g.,flatworms).
$B$. Renette cells are specialized excretory cells found in Nematodes (roundworms).
$C$. Green glands (antennary glands) are the excretory organs found in Crustaceans (e.g.,prawns).
Since all these structures are involved in excretion in their respective animal groups,the correct answer is $D$.

$(A)$ The excretory structures for the given animals are as follows:
$A$. Flatworms (Platyhelminthes) possess flame cells (protonephridia) for excretion.
$B$. Earthworms (Annelida) possess nephridia as their primary excretory organs.
$C$. Cockroaches (Arthropoda) possess Malpighian tubules for excretion.
$D$. Roundworms (Aschelminthes) possess renette cells (or excretory canals) for excretion.
Therefore, the correct matching is $A-ii, B-i, C-iii, D-iv$.

(C) The excretory organ in prawns (which belong to the phylum $Arthropoda$,class $Crustacea$) is known as the green gland or antennary gland.
Flame cells are the excretory structures in $Platyhelminthes$.
Nephridia are the excretory structures in $Annelida$.
Solenocytes are specialized flame cells found in some invertebrates.

(A) Green glands,also known as antennary glands,are the specialized excretory organs found in crustaceans such as $Prawn$ (Palaemon).
They are located in the head region and help in the process of osmoregulation and excretion of nitrogenous wastes.
Butterflies belong to the phylum $Arthropoda$ but use Malpighian tubules for excretion.
Snails belong to the phylum $Mollusca$ and use metanephridia (kidneys) for excretion.
Earthworms belong to the phylum $Annelida$ and use nephridia for excretion.

(D) : In $Paramecium$,the contractile vacuole is primarily involved in osmoregulation (water balance) rather than excretion of nitrogenous wastes. Excretion in $Paramecium$ occurs mainly through the general body surface via diffusion.
$R$: In $Planaria$ (flatworms),flame cells (protonephridia) are specialized excretory structures that perform osmoregulation and excretion.
Therefore,statement $A$ is false because the primary function of the contractile vacuole is osmoregulation,not excretion,and statement $R$ is true.

(A) The correct answer is $A$.
$1$. Green glands (antennary glands) are the excretory organs found in crustaceans like prawns,not in $Peripatus$. $Peripatus$ (an arthropod) uses nephridia for excretion.
$2$. Flame cells (protonephridia) are the excretory structures in Platyhelminthes (flatworms). Corals (Cnidarians) do not have specialized excretory organs; they excrete waste via diffusion through the body surface.
$3$. Protonephridia are the excretory organs in $Wuchereria$ (a nematode).
$4$. Nephridia are the excretory organs in annelids like the Leech $(Hirudinaria)$.
Since the question asks for the incorrect option,and both $A$ and $B$ contain inaccuracies,$A$ is the most commonly cited incorrect pairing in standard biology curricula regarding arthropod excretory systems.

(B) The correct option is $B$.
Nephridia are the primary excretory organs of the earthworm $(Pheretima)$.
Earthworms possess three types of nephridial structures based on their location: septal,integumentary,and pharyngeal nephridia.
These structures vary in their position and physiological function.
Septal and pharyngeal nephridia are enteronephric,meaning they discharge nitrogenous wastes into the alimentary canal.
Integumentary nephridia are exonephric,as they discharge nitrogenous wastes directly to the exterior of the body.

(A) : Nephridia are the excretory organs of earthworms,consisting of simple or branched tubes formed by the ingrowth of ectoderm with cilia at the inner end. Excretory products diffuse into the nephridium and are moved to the exterior by ciliary action.
Malpighian tubules are the organs involved in the excretion of nitrogenous wastes in cockroaches. They open into the intestine,selectively extract uric acid from the blood,which,together with water and salts,is deposited into the hindgut and excreted in the faeces.
Therefore,both are correctly categorized as excretory organs.

(B) is the correct option.
In salamanders (amphibians),kidneys are the primary excretory organs,and they are ureotelic,meaning they excrete urea.
In $Labeo$ (bony fish),the excretory organ is the mesonephric kidney,and they are ammonotelic,meaning they excrete ammonia.
In peacocks (birds),the excretory organ is the metanephric kidney,but they are uricotelic,meaning they excrete uric acid to conserve water.
In houseflies (insects),excretion occurs via Malpighian tubules,and the primary excretory product is uric acid,not renal tubules.

(B) The excretory organs in earthworms $(Pheretima)$ and other annelids are known as $Nephridia$.
$Flame$ $cells$ are the excretory structures in $Platyhelminthes$.
$Kidneys$ are the primary excretory organs in vertebrates.
$Malpighian$ $tubules$ are the excretory organs in most insects and other arthropods.

(D) Antennal glands,also known as green glands,are specialized excretory organs found in many crustaceans,such as prawns and crayfish.
These glands are located in the head region near the antennae,hence the name 'antennal glands'.
In contrast,annelids use nephridia for excretion,insects (like cockroaches) use Malpighian tubules,and cephalochordates use protonephridia.

(B) In crustaceans (such as prawns and crabs),the primary excretory organs are known as green glands or antennary glands.
Malpighian tubules are found in insects.
Nephridia are the excretory structures in annelids like earthworms.
Kidneys are the primary excretory organs in vertebrates.

(C) The correct matching of excretory organs with the organisms is as follows:
$(a)$ Protonephridia are primarily concerned with osmoregulation and excretion in Platyhelminthes (flatworms),rotifers,some annelids,and the cephalochordate amphioxus. Thus,$a-II$.
$(b)$ Nephridia are the tubular excretory structures of earthworms and other annelids. Thus,$b-IV$.
$(c)$ Malpighian tubules are the excretory organs of most insects,including cockroaches. Thus,$c-III$.
$(d)$ Green glands or antennal glands perform the excretory function in crustaceans like prawns. Thus,$d-I$.
Therefore,the correct sequence is $a-II, b-IV, c-III, d-I$.

(C) In $Amoeba$,the excretion of metabolic wastes (primarily ammonia) occurs through the general body surface,which is the plasma membrane,via the process of diffusion. While the contractile vacuole is primarily involved in osmoregulation (water balance),the plasma membrane serves as the site for the elimination of nitrogenous waste products.

(A) Malpighian tubules are the primary excretory organs found in insects and many other terrestrial arthropods.
They function by absorbing waste products from the hemolymph and discharging them into the digestive tract for excretion.
Therefore,the correct option is $A$.

(C) Nephridia are the excretory organs in earthworms $(Pheretima)$.
Flame cells (protonephridia) are the specialized excretory cells found in Platyhelminthes (e.g.,liver flukes like $Fasciola$ $hepatica$).
Both structures perform the function of excretion and osmoregulation.
Therefore,flame cells are functionally analogous to nephridia.

(D) The correct matching of organisms with their respective excretory structures is as follows:
$A$. Cockroach: Excretes through $II$. Malpighian tubules.
$B$. Cat fish: Being a vertebrate, it excretes through $III$. Kidneys.
$C$. Earthworm: Excretes through $I$. Nephridia.
$D$. Balanoglossus: Excretes through $V$. Proboscis gland.
$E$. Flatworm: Excretes through $IV$. Flame cells.
Thus, the correct sequence is $A-II, B-III, C-I, D-V, E-IV$.

(N/A) Various animal groups exhibit a wide range of excretory structures:
$1$. $Protonephridia$ (Flame cells): These are simple tubular structures found in $Platyhelminthes$ (e.g.,$Planaria$),rotifers,some annelids,and cephalochordates (e.g.,$Amphioxus$). They are primarily involved in osmoregulation (ionic and fluid volume regulation).
$2$. $Nephridia$: These are tubular excretory structures found in earthworms and other annelids. They help in the removal of nitrogenous wastes and maintain fluid and ionic balance.
$3$. $Malpighian$ $tubules$: These are the excretory structures of most insects,including cockroaches. They assist in the removal of nitrogenous wastes and osmoregulation.
$4$. $Antennal$ $glands$ (or $Green$ $glands$): These perform the excretory function in crustaceans like prawns.
$5$. $Kidneys$: In vertebrates,complex tubular organs called kidneys are the primary excretory structures responsible for filtration,reabsorption,and secretion to maintain homeostasis.

$(A-6, B-2, C-5, D-3, E-4, F-1)$ The correct matching is as follows:
$(a)$ Balanoglossus: $(6)$ Proboscis gland
$(b)$ Leech: $(2)$ Nephridia
$(c)$ Locust: $(5)$ Malpighian tubule
$(d)$ Liver fluke: $(3)$ Flame cells
$(e)$ Sea urchin: $(4)$ Absent (Excretion occurs via water vascular system)
$(f)$ Pila: $(1)$ Metanephridia (specifically, renal organ/Bojanus organ)
Therefore, the correct sequence is: $(a-6, b-2, c-5, d-3, e-4, f-1)$.

(B) Antennal glands,also known as green glands,are the specialized excretory organs found in crustaceans such as prawns.
These glands are responsible for the filtration of hemolymph and the excretion of nitrogenous waste,primarily in the form of ammonia.

(A) In $Amoeba$,the excretory structure is the contractile vacuole.
It primarily functions in osmoregulation by collecting excess water and waste products from the cytoplasm and expelling them out of the cell through the plasma membrane.

(A) $(1)$ Reptiles and birds are uricotelic animals,meaning they excrete nitrogenous waste in the form of uric acid to conserve water.
$(2)$ In Platyhelminthes (flatworms),the specialized excretory structures responsible for osmoregulation and excretion are known as flame cells (protonephridia).

(A) $(1)$ The excretory organ in prawns (crustaceans) is the green gland (also known as antennal gland).
$(2)$ Renin is a peptide hormone secreted by the juxtaglomerular apparatus $(JGA)$ in response to a decrease in glomerular blood pressure or flow.