Case Based Questions Test: Animal Kingdom - NEET MCQ

Amphibians are the first tetrapods to invade the land. The juvenile phase of the life cycle is dependent on water, where gas exchange occurs through gills. Amphibians have aquatic larval life and terrestrial adult life. Respiration is by gills, lungs and skin. Their body is divisible into head and trunk and skin is moist without scales. The two pairs of limbs are used for locomotion except for caecilians. They are cold blooded animals. Respiration is by gills (in larva), lungs and skin (in adults). Amphibians have a three-chambered heart. Fertilisation is external. However, in Salamander and Ichthyophis fertilization is internal. They are mostly oviparous, except for Salamander, which is viviparous. Development is indirect.

Q. In some amphibians even after attaining sexual maturity, larval characters are retained. It is known as _______.

Amphibians are the first tetrapods to invade the land. The juvenile phase of the life cycle is dependent on water, where gas exchange occurs through gills. Amphibians have aquatic larval life and terrestrial adult life. Respiration is by gills, lungs and skin. Their body is divisible into head and trunk and skin is moist without scales. The two pairs of limbs are used for locomotion except for caecilians. They are cold blooded animals. Respiration is by gills (in larva), lungs and skin (in adults). Amphibians have a three-chambered heart. Fertilisation is external. However, in Salamander and Ichthyophis fertilization is internal. They are mostly oviparous, except for Salamander, which is viviparous. Development is indirect.

Direction : In the following questions the Assertions (A) and Reasons (R) have been put forward. Read both the statements and choose the correct option from the following:

Assertion : Amphibians usually hibernate in winter and undergo aestivation in summer.

Reason : They are poikilothermic animals.

The members of phylum Annelida are known as “the segmented worms”. Their body is metamerically segmented. They are triploblastic and coelomate animals. The excretory units of these invertebrates are coiled tubules, the nephridia. They help in osmoregulation.

Example: Nereis, Pheretima and Hirudinaria. Body

Symmetry: Segmented worms have the typical metameric segmentation. Their body consists of segments called somites or metameres and ring like grooves known as annuli. They have bilateral symmetry.

Mode of Respiration: Respiration in annelids occurs through the skin. In some, gills are present.

Q. Which is false about annelids:

The members of phylum Annelida are known as “the segmented worms”. Their body is metamerically segmented. They are triploblastic and coelomate animals. The excretory units of these invertebrates are coiled tubules, the nephridia. They help in osmoregulation.

Example: Nereis, Pheretima and Hirudinaria. Body

Symmetry: Segmented worms have the typical metameric segmentation. Their body consists of segments called somites or metameres and ring like grooves known as annuli. They have bilateral symmetry.

Mode of Respiration: Respiration in annelids occurs through the skin. In some, gills are present.

Q. Nephridia of earthworm are analogous to _______.

The members of phylum Annelida are known as “the segmented worms”. Their body is metamerically segmented. They are triploblastic and coelomate animals. The excretory units of these invertebrates are coiled tubules, the nephridia. They help in osmoregulation.

Example: Nereis, Pheretima and Hirudinaria. Body

Symmetry: Segmented worms have the typical metameric segmentation. Their body consists of segments called somites or metameres and ring like grooves known as annuli. They have bilateral symmetry.

Mode of Respiration: Respiration in annelids occurs through the skin. In some, gills are present.

Q. Metamerism is characteristic of __________.

The members of phylum Annelida are known as “the segmented worms”. Their body is metamerically segmented. They are triploblastic and coelomate animals. The excretory units of these invertebrates are coiled tubules, the nephridia. They help in osmoregulation.

Example: Nereis, Pheretima and Hirudinaria. Body

Symmetry: Segmented worms have the typical metameric segmentation. Their body consists of segments called somites or metameres and ring like grooves known as annuli. They have bilateral symmetry.

Mode of Respiration: Respiration in annelids occurs through the skin. In some, gills are present.

Q. Earthworms have how many segments?

The members of phylum Annelida are known as “the segmented worms”. Their body is metamerically segmented. They are triploblastic and coelomate animals. The excretory units of these invertebrates are coiled tubules, the nephridia. They help in osmoregulation.

Example: Nereis, Pheretima and Hirudinaria. Body

Symmetry: Segmented worms have the typical metameric segmentation. Their body consists of segments called somites or metameres and ring like grooves known as annuli. They have bilateral symmetry.

Mode of Respiration: Respiration in annelids occurs through the skin. In some, gills are present.

Direction : In the following questions the Assertions (A) and Reasons (R) have been put forward. Read both the statements and choose the correct option from the following:

Assertion : Earthworms are ammonotelic when plenty of water is available.

Reason : Main excretory product in earthworm is urea.

Members of this phylum porifera are commonly known as sponges. They are asymmetrical animals. They are primitive multicellular animals with cellular level of organisation. Body wall is two layered -outer dermal layer called pinacoderm and inner gastral layer called choanoderm. Pinacocytes cells are present in the pinacoderm and collar cells or choanocytes are present in the choanoderm. The body possess minute pores called ostia, a large cavity called spongocoel and a pore called osculum. They have a water canal system. Water enters through minute pores called ostia in the spongocoel and from the spongocoel goes out through the osculum. The body is supported by a skeleton. They are hermaphrodite and reproduce by asexual and sexual reproduction.

Q. Cells that line the inner chambers of sponges, helping water circulation to continue are ________.

Members of this phylum porifera are commonly known as sponges. They are asymmetrical animals. They are primitive multicellular animals with cellular level of organisation. Body wall is two layered -outer dermal layer called pinacoderm and inner gastral layer called choanoderm. Pinacocytes cells are present in the pinacoderm and collar cells or choanocytes are present in the choanoderm. The body possess minute pores called ostia, a large cavity called spongocoel and a pore called osculum. They have a water canal system. Water enters through minute pores called ostia in the spongocoel and from the spongocoel goes out through the osculum. The body is supported by a skeleton. They are hermaphrodite and reproduce by asexual and sexual reproduction.

Q. Sponges gather food particles with the help of specialised ______ collar cells.

Members of this phylum porifera are commonly known as sponges. They are asymmetrical animals. They are primitive multicellular animals with cellular level of organisation. Body wall is two layered -outer dermal layer called pinacoderm and inner gastral layer called choanoderm. Pinacocytes cells are present in the pinacoderm and collar cells or choanocytes are present in the choanoderm. The body possess minute pores called ostia, a large cavity called spongocoel and a pore called osculum. They have a water canal system. Water enters through minute pores called ostia in the spongocoel and from the spongocoel goes out through the osculum. The body is supported by a skeleton. They are hermaphrodite and reproduce by asexual and sexual reproduction.

Q. The skeleton of sponges are composed of _______ .

Members of this phylum porifera are commonly known as sponges. They are asymmetrical animals. They are primitive multicellular animals with cellular level of organisation. Body wall is two layered -outer dermal layer called pinacoderm and inner gastral layer called choanoderm. Pinacocytes cells are present in the pinacoderm and collar cells or choanocytes are present in the choanoderm. The body possess minute pores called ostia, a large cavity called spongocoel and a pore called osculum. They have a water canal system. Water enters through minute pores called ostia in the spongocoel and from the spongocoel goes out through the osculum. The body is supported by a skeleton. They are hermaphrodite and reproduce by asexual and sexual reproduction.

Q. Members of phylum Porifera are

Members of this phylum porifera are commonly known as sponges. They are asymmetrical animals. They are primitive multicellular animals with cellular level of organisation. Body wall is two layered -outer dermal layer called pinacoderm and inner gastral layer called choanoderm. Pinacocytes cells are present in the pinacoderm and collar cells or choanocytes are present in the choanoderm. The body possess minute pores called ostia, a large cavity called spongocoel and a pore called osculum. They have a water canal system. Water enters through minute pores called ostia in the spongocoel and from the spongocoel goes out through the osculum. The body is supported by a skeleton. They are hermaphrodite and reproduce by asexual and sexual reproduction.

Direction : In the following questions the Assertions (A) and Reasons (R) have been put forward. Read both the statements and choose the correct option from the following:

Assertion : Canal system of sponges helps in nutritions.

Reason : The current of water which flows through canal system brings food to sponges.

(A) and Reasons (R) have been put forward. Read both the statements and choose the correct option from the following: