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In some animal groups, the body is found divided into compartments with serial repitition of at least some organs. This characteristic feature is called
(b) The serial repetition of organs when the body is divided into compartments is called metamerism because metamerism is the phenomenon of having a linear series of body segments fundamentally similar in structure. It is mainly seen in phylum annelida.
So, the correct answer is Metamerism.
Which one of the following sets of animals share a four-chambered heart?
(b) Crocodiles, birds, and mammals have a four-chambered hearts.
The heart is usually three-chambered in reptiles with the exception of crocodiles, which possess a four-chambered heart. The division in their heart is due to the incomplete interventricular septum, in the ventricles.
Heart in birds and mammals is four-chambered and there is a complete division of interventricular septum in ventricles. Whereas, amphibians possess a three-chambered heart in which the ventricle is not divided hence, 2 atria and one ventricle is present.
Which of the following pairs of animals has non glandular skin
(b) Chameleon and turtle belong to class-Reptilia and possess dry and non-glandular skin with scales, Frog, pigeon, and tiger possess modifications in their skin according to adaptations in their respective habitats.
Birds and mammals share one of the following characteristics as a common feature.
(d) Birds and mammals regulate their metabolic processes to maintain a constant body temperature. Thus, both are homoiothermic (warm-blooded) organisms found in nature. They are the only known living homeotherms.
Characteristics of Aves include pneumatic bones, feather-covered bodies, and oviparity.
Whereas, mammals have solid bones and melanocytes producing melanin in the skin and they are viviparous. Hence, Option d – warm-blooded is the correct option because both mammals and birds perform homeostasis.
Which one of the following sets of animals belong to a single taxonomic group?
(c) Monkey, chimpanzee, and man are primates belonging to Class Mammalia.
Which one of the following statements is incorrect?
(c) Fasciola belongs to the phylum Platyhelminthes. The organisms of this phylum are acoelomates and not pseudocoelomates. So, the incorrect statement is, Fasciola is a pseudocoelomate animal.
Which one of the following statements is incorrect?
(a) The statement (a) is incorrect because Malpighian tubules are excretory structures in most of the insects, including cockroaches, but green glands perform excretory functions in crustaceans like prawns, whereas all the other statements are true.
Which one of the following is oviparous?
(a) Platypus, bat, elephant, and whale, all belong to a Class Mammalia of subphylum Vertebrata. Out of the four, the only platypus is oviparous (egg-laying), rest are viviparous (glib birth to young ones).
Which one of the following is a non-poisonous snake?
(c) Python is a large and non-poisonous snake. It kills its prey by coiling around and crushing it before swallowing it.
Match the following list of animals with their level of organisation.
Division of Labour Animal
Column I Column II
A. Organ level i. Pheretima
B. Cellular aggregate level ii. Fasciola
C. Tissue level iii. Spongilla
D. Organ system level iv. Obelia
Choose the correct match showing the division of labour with an animal example.
(c) (i)-D, (ii) – A, (iii)-B, (iv) – C
Pheretima possesses an organ system level of organisation. Fasciola possesses organ-level organisation. Spongilla possesses cellular aggregate level organisation. Obelia possesses tissue-level organisation.
The body cavity is the cavity present between the body wall and gut wall. In some animals, the body cavity is not lined by mesoderm. Such animals are called
(b) Acoelomates are characterised by the absence of a coelom or body cavity while coelomates are those organisms where mesoderm lines the coelom. Pseudocoelomates are those, which have a body cavity (derived from blastocoel of the embryo) but are not lined with mesoderm, e.g., roundworms.
Match the column A with column B and choose the correct option
Column I Column II
A. Porifera i. Canalsystem
B. Aschelminthes ii. Water-vascular system
C. Annelida iii. Muscular pharynx
D. Arthropoda iv. Jointed appendages
E. Echinodermata v. Metameres
(c) The body of Porifera (sponges) is organized in such a way so that they form a complex system of pores and canals called the canal system. This system helps in regulating the flow of water within them, e.g., Sycon.
Aschelminthes possess a muscular pharynx. e.g., Ascaris.
Annelids possess metameric segmentation in the body, e.g., the earthworm.
Arthropods possess jointed appendages in each segment of their body, e.g., Cockroaches.
Echinodermata possess a water vascular system or ambulacral system, e.g., Starfish.
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