which was one of the first animals to develop a true body cavity? -General Knowledge

which was one of the first animals to develop a true body cavity? -General Knowledge
by

1 Answer

Answer :

The answer is mollusks and annelids.
by

Related questions

In gymnosperms, the pollen chamber represents (a) a cavity in the ovule in which pollen grains are stored after pollination (b) an opening in the megagametophyte through which the pollen tube approaches the egg(c) the microsporangium in which pollen grains develop (d) a cell in the pollen grain in which the sperms are formed.

Description : In gymnosperms, the pollen chamber represents (a) a cavity in the ovule in which pollen grains are stored after pollination (b) an opening in the megagametophyte through which the pollen tube approaches the ... pollen grains develop (d) a cell in the pollen grain in which the sperms are formed.

Last Answer : (c) the microsporangium in which pollen grains develop

Body cavity is the cavity present between body wall and gut wall. In some animals the body cavity is not lined by mesoderm. Such animals are called

Description : Body cavity is the cavity present between body wall and gut wall. In some animals the body cavity is not lined by mesoderm. Such animals are called

Last Answer : Body cavity is the cavity present between body wall and gut wall. In some animals the ... Acoelomate B. Pseudocoelomate C. Coelomate D. Haemocoelomate

How are the animals classified based on body cavity?

Description : How are the animals classified based on body cavity?

Last Answer : How are the animals classified based on body cavity?

Sycon belongs to a group of animals, which are best described as (a) unicellular or acellular (b) multicellular without any tissue organization (c) multicellular with a gastrovascular system (d) multicellular having tissue organization, but no body cavity.

Description : Sycon belongs to a group of animals, which are best described as (a) unicellular or acellular (b) multicellular without any tissue organization (c) multicellular with a gastrovascular system (d) multicellular having tissue organization, but no body cavity.

Last Answer : (b) multicellular without any tissue organization

Give reasons for the following (i)The human testes are located outside the abdominal cavity. (ii)Some organisms like honeybees are called parthenogenetic animals -Biology

Description : Give reasons for the following (i)The human testes are located outside the abdominal cavity. (ii)Some organisms like honeybees are called parthenogenetic animals -Biology

Last Answer : Testes are located outside the abdominal cavity within a pouch called scrotum. Scrotum maintains low temperature of the testes (2-2.5°C lower than normal body temp­erature) ... from unfertilised diploid eggs (and do not undergo fertilisation) they are called parthenogenetic animals.

$ The first formed embryonic cavity is called blastocoel. ! Annelids have a segmented body.

Description : $ The first formed embryonic cavity is called blastocoel. ! Annelids have a segmented body.

Last Answer : $ The first formed embryonic cavity is called blastocoel. ! Annelids have a segmented body. A. If both As ... is wrong D. If both As and R are wrong.

What is the name of Hydra's body cavity ?

Description : What is the name of Hydra's body cavity ?

Last Answer : Answer : Hydra's body cavity is known as cilantro.

What is the body cavity surrounded by wall called ?

Description : What is the body cavity surrounded by wall called ?

Last Answer : : The body cavity surrounded by a wall is called cilantro.

Body cavity of arthropods is called

Description : Body cavity of arthropods is called

Last Answer : Body cavity of arthropods is called A. Coeleom B. Hemocoel C. Pseudocoel D. Gastrovascular cavity

The body cavity of cockroach is called :

Description : The body cavity of cockroach is called :

Last Answer : The body cavity of cockroach is called : A. Pseudocel B. Coelom C. Hydrocoel D. Haemocoel

Pituitary gland is lodge in a body cavity of which skull bone ?

Description : Pituitary gland is lodge in a body cavity of which skull bone ?

Last Answer : Pituitary gland is lodge in a body cavity of which skull bone ? A. Temporal B. Occipital C. Sphenoid D. Parietal

Why the body cavity of cockroach is called haemoceol?

Description : Why the body cavity of cockroach is called haemoceol?

Last Answer : the body cavity of cockroach is called heamoceol because their blood circulates in the body sinuses .these blood sinuses collectively known as haemoceol.

An invertebrate does not have – (1) Notochord (2) Body cavity (3) Haernocoel (4) Gills

Description : An invertebrate does not have – (1) Notochord (2) Body cavity (3) Haernocoel (4) Gills

Last Answer : (1) Notochord Explanation: An invertebrate does not have back bone and cell wall

Round worms are triploblastic. the body cavity of round worms are?

Description : Round worms are triploblastic. the body  cavity of round worms are?

Last Answer : Pseudocoel

The testes in humans are situated outside the abdominal cavity inside a pouch called scrotum. The purpose served is for (a) maintaining the scrotal temperature lower than the internal body temperature (b) escaping any possible compression by the visceral organs (c) providing more space for the growth of epididymis (d) providing a secondary sexual feature for exhibiting the male sex.

Description : The testes in humans are situated outside the abdominal cavity inside a pouch called scrotum. The purpose served is for (a) maintaining the scrotal temperature lower than the internal body ... growth of epididymis (d) providing a secondary sexual feature for exhibiting the male sex.

Last Answer : (a) maintaining the scrotal temperature lower than the internal body temperature

Which of the following features is not present in Periplaneta americana? (a) Exoskeleton composed of N-acetylglucosamine (b) Metamerically segmented body (c) Schizocoelom as body cavity (d) Indeterminate and radial cleavage during embryonic development

Description : Which of the following features is not present in Periplaneta americana? (a) Exoskeleton composed of N-acetylglucosamine (b) Metamerically segmented body (c) Schizocoelom as body cavity (d) Indeterminate and radial cleavage during embryonic development

Last Answer : (a) Exoskeleton composed of N-acetylglucosamine

In contrast to annelids the platyhelminthes show (a) absence of body cavity (b) bilateral symmetry (c) radial symmetry (d) presence of pseudocoel.

Description : In contrast to annelids the platyhelminthes show (a) absence of body cavity (b) bilateral symmetry (c) radial symmetry (d) presence of pseudocoel.

Last Answer : (a) absence of body cavity

An animal kept in a jar has the following features. (I) It is bilaterally symmetrical. (II) It has coelomic cavity (Ill) The body is segmented (IV) It has jointed appendages. To which phylum does the animal belong to? (1) Arthropoda (2) Annelida (3) Platyhelminthes (4) Mollusca

Description : An animal kept in a jar has the following features. (I) It is bilaterally symmetrical. (II) It has coelomic cavity (Ill) The body is segmented (IV) It has jointed appendages. To which phylum does the animal belong to? (1) Arthropoda (2) Annelida (3) Platyhelminthes (4) Mollusca

Last Answer : I) It is bilaterally symmetrical.

13. The sequence of accessory ducts from the testis to the body cavity in Man is--------- (a) Rete testis,vasaefferentia, epididymis and vas deferens (b) Vasa efferentia, rete testis, vas deferns and epididymis (c) Vasa efferetia, vas deferens, epididymis and rete testis (d) Epididymis, vasa efferentia , rete testis and vas deferens

Description : 13. The sequence of accessory ducts from the testis to the body cavity in Man is--------- (a) Rete testis,vasaefferentia, epididymis and vas deferens (b) Vasa efferentia, rete testis, ... , vas deferens, epididymis and rete testis (d) Epididymis, vasa efferentia , rete testis and vas deferens

Last Answer : (a) Rete testis,vasaefferentia, epididymis and vas deferens

An invertebrate does not have (1) Notochord (2) Body cavity (3) Haemocoel (4) Gills

Description : An invertebrate does not have (1) Notochord (2) Body cavity (3) Haemocoel (4) Gills

Last Answer : Notochord

Is it true or false that The cochlea is a liquid-filled cavity in the inner ear.?

Description : Is it true or false that The cochlea is a liquid-filled cavity in the inner ear.?

Last Answer : true or falseThe cochlea is a liquid-filled cavity in the inner ear.

The following statement(s) is/are true concerning host defense mechanisms to intraabdominal infection. a. Bacterial clearance can occur via translymphatic absorption b. Phagocytic activity and bacterial killing can occur via resident phagocytic cells and an influx of PMNs c. A fibrinogen-rich inflammatory exudate is released into the peritoneal cavity, trapping large numbers of bacteria and other particulate matter d. Perforations of a bowel may be walled off but are seldom sealed by the omentum and other mobile viscera

Description : The following statement(s) is/are true concerning host defense mechanisms to intraabdominal infection. a. Bacterial clearance can occur via translymphatic absorption b. Phagocytic activity and bacterial killing can ... may be walled off but are seldom sealed by the omentum and other mobile viscera

Last Answer : Answer: a, b, c The introduction of microorganisms into the normally sterile peritoneal environment invoke several potent specialized host antimicrobial defense mechanisms. Bacterial clearance, ... the contaminated enteric contents walled off, preventing continued soilage of the peritoneal cavity

.Which of the following is true: A. Antibiotics are useful in the treatment of periodontitis B. Trauma from occlusion causes thickening of the marginal gingivae C. Periodontitis is the primary cause of teeth lost after the age of 35. D. All periodontal pockets can be identified by x-ray E. Periodontitis is the most common disease in the oral cavity

Description : .Which of the following is true:  A. Antibiotics are useful in the treatment of periodontitis   B. Trauma from occlusion causes thickening of the marginal gingivae  C. Periodontitis is the ... can be identified by x-ray  E. Periodontitis is the most common disease in the oral cavity

Last Answer : E. Periodontitis is the most common disease in the oral cavity

Is it morally acceptable to experiment on non-human animals to develop products and medicines that benefit human beings?

Description : Is it morally acceptable to experiment on non-human animals to develop products and medicines that benefit human beings?

Last Answer : Sure. Why not?

Bubonic plague occurs a) after the organism enters through the skin. Bubonic refers to enlarged lymph nodes that develop after the organism enters through the skin. Bubonic plague is the form seen most frequently, as the organism is transferred from rodents or other animals to humans by insect bite.

Description : Bubonic plague occurs a) after the organism enters through the skin. Bubonic refers to enlarged lymph nodes that develop after the organism enters through the skin. Bubonic plague is the form seen ... frequently, as the organism is transferred from rodents or other animals to humans by insect bite.

Last Answer : a) after the organism enters through the skin. Bubonic refers to enlarged lymph nodes that develop after the organism enters through the skin. Bubonic plague is the form seen most frequently, as the organism is transferred from rodents or other animals to humans by insect bite.

In general, chest drainage tubes are not used for the patient undergoing a) Pneumonectomy Usually, no drains are used for the pneumonectomy patient because the accumulation of fluid in the empty hemithorax prevents mediastinal shift. b) Lobectomy With lobectomy, two chest tubes are usually inserted for drainage, the upper for air and the lower for fluid c) Wedge resection With wedge resection, the pleural cavity usually is drained because of the possibility of an air or blood leak d) Segmentectomy With segmentectomy, drains are usually used because of the possibility of an air or blood leak.

Description : In general, chest drainage tubes are not used for the patient undergoing a) Pneumonectomy Usually, no drains are used for the pneumonectomy patient because the accumulation of fluid in the empty ... With segmentectomy, drains are usually used because of the possibility of an air or blood leak.

Last Answer : a) Pneumonectomy Usually, no drains are used for the pneumonectomy patient because the accumulation of fluid in the empty hemithorax prevents mediastinal shift.