Recent questions tagged ch4

1. Vertebrata includes Divisions Agnatha and Gnathostomata. 2. Gnathostomata includes Super Classes Pisces and Tetrapoda. 3. Divisions Agnatha includes Class Cyclostomata. Regarding 1,2 and 3:

asked Mar 20, 2014 by pady_1

1 answer

Regarding vertebrates : 1. They have a ventral muscular heart with two, three or four chambers. 2. They have kidneys for excretion and osmoregulation 3. They have paired appendages which may be limbs but never fins.

asked Mar 20, 2014 by pady_1

1 answer

1. In Urochordata, notochord is present only in larval tail. 2. In Cephalochordata,notochord extends from head to tail region 3. In Cephalochordata,notochord is persistent throughout their life. Regarding 1,2 and 3:

asked Mar 20, 2014 by pady_1

1 answer

Phylum – Hemichordata : 1. Sexes are separate. 2. Fertilisation is internal. 3. Development is direct . Regarding 1,2 and 3:

asked Mar 20, 2014 by pady_1

1 answer

Phylum – Hemichordata : 1. Circulatory system is of closed type. 2. Respiration takes place through gills. 3. Excretory organ is proboscis gland. Regarding 1,2 and 3:

asked Mar 20, 2014 by pady_1

1 answer

1. Hemichordata was considered as a sub-phylum under phylum Chordata earlier. 2. Now it is placed as a separate phylum under non-chordata. 3. This phylum consists of a small group of worm-like marine animals. Regarding 1,2 and 3 :

asked Mar 20, 2014 by pady_1

1 answer

Phylum Echinodermata : 1. Digestive system is complete 2. They have mouth on the upper (dorsal) side 3. Anus is on the lower (ventral) side. Regarding 1,2 and 3:

asked Mar 20, 2014 by pady_1

1 answer

In Mollusca : 1. The posterior head region has sensory tentacles. 2. The mouth contains a file-like rasping organ for feeding 3. The file-like rasping organ for feeding is called morula Regarding 1,2 and 3:

asked Mar 20, 2014 by pady_1

1 answer

In Mollusca : 1. A soft and spongy layer of skin forms a mantle over the calcarious hump. 2. The space between the hump and the mantle is called the mantle cavity 3. In mantle cavityfeather like gills are present. Regarding 1,2 and 3:

asked Mar 20, 2014 by pady_1

1 answer

Regarding Molluscs : 1. Body is covered by a calcareous shell 2. Body is unsegmented 3. They have a distinct head, muscular foot and visceral hump Regarding 1,2 and 3:

asked Mar 20, 2014 by pady_1

1 answer

Regarding Arthropoda : 1. They are mostly ovoviviparous. 2. Development is direct. 3. Development is indirect. Regarding 1,2 and 3:

asked Mar 20, 2014 by pady_1

1 answer

Regarding Arthropoda : 1. It is the second largest phylum of Animalia 2. It includes insects. 3. Over one-thirds of all named species on earth are arthropods Regarding 1,2 and 3:

asked Mar 20, 2014 by pady_1

1 answer

In Annelida : 1. Members of phylum Annelida are dioecious. 2. Members of phylum Annelida are monoecious 3. Reproduction is sexual. Regarding 1,2 and 3:

asked Mar 20, 2014 by pady_1

1 answer

In Annelida : 1. A closed circulatory system is present. 2. Neural system consists of paired ganglia 3. Paired ganglia connected by lateral nerves to a single ventral nerve cord. Regarding 1,2 and 3:

asked Mar 20, 2014 by pady_1

1 answer

Regarding Aschelminthes: 1. Fertilisation is internal 2. Development is direct. 3. Development is indirect. Regarding 1,2 and 3:

asked Mar 20, 2014 by pady_1

1 answer

Regarding Aschelminthes: 1. Sexes are separate 2. They are monoecious. 3. Often females are longer than males. Regarding 1,2 and 3:

asked Mar 20, 2014 by pady_1

1 answer

Regarding Aschelminthes: 1. Alimentary canal is incomplete 2. They a well- developed muscular pharynx. 3. An excretory tube removes body wastes from the body cavity through the excretory pore. Regarding 1,2 and 3:

asked Mar 20, 2014 by pady_1

1 answer

Regarding Platyhelminthes : 1. Planaria possess high regeneration capacity. 2. Tapeworm is Taenia and it is an intestinal parasite. 3. Fasciola hepatica is Liver fluke Regarding 1,2 and 3:

asked Mar 20, 2014 by pady_1

1 answer

Regarding Platyhelminthes : 1. Sexes are separate. 2. Fertilisation is internal. 3. Development is through many larval stages Regarding 1,2 and 3:

asked Mar 20, 2014 by pady_1

1 answer

Regarding Platyhelminthes : 1. They are mostly endoparasites found in animals including human beings. 2. Hooks and suckers are present in the parasitic forms. 3. Some of them absorb nutrients from the host directly through their body surface. Regarding 1,2 and 3:

asked Mar 20, 2014 by pady_1

1 answer

In Ctenophores: 1. Sexes are separate. 2. Reproduction takes place only by sexual means. 3. Fertilisation is internal. 4. Development is direct Regarding 1,2,3 and 4:

asked Mar 20, 2014 by pady_1

1 answer

1. Cnidarians exhibit one of two basic body forms called polyp and medusa. 2. Some cnidarians which exist in both forms exhibit alternation of generation. 3. Alternation of generation is Metagenesis. 4. Polyps produce medusae sexually 5. Medusae form the polyps asexually Regarding 1,2,3,4 and 5:

asked Mar 20, 2014 by pady_1

1 answer

1. Cnidarians exhibit two basic body forms called polyp and medusa. 2. Polyp is a sessile and spherical form 3. Medusa is umbrella-shaped and free-swimming Regarding 1,2 and 3:

asked Mar 20, 2014 by pady_1

1 answer

1. Cnidarians have a central gastro-vascular cavity 2. They have a single opening, mouth or hypostome. 3. Digestion is extracellular 4. Digestion is intracellular. Regarding 1,2,3 and 4:

asked Mar 20, 2014 by pady_1

1 answer

In Sponges : 1. Eggs and sperms are produced by different individual. 2. Fertilisation is external 3. Development is indirect having a larval stage which is morphologically similar to the adult. Regarding 1,2 and 3:

asked Mar 20, 2014 by pady_1

1 answer

In Sponges : 1. Digestion is extracellular. 2. The body is supported by a skeleton made up of spicules or spongin fibres. 3. Sexes are separate Regarding 1,2 and 3:

asked Mar 20, 2014 by pady_1

1 answer

1. Sponges have a water transport or canal system. 2. Water enters through minute pores (osculum) in the body wall into a central cavity, spongocoel, from where it goes out through the ostia. 3. This pathway of water transport is helpful in food gathering, respiratory exchange and removal of waste. Regarding 1,2 and 3:

asked Mar 20, 2014 by pady_1

1 answer

1. Members of phylum - porifera are commonly known as sponges. 2. Sponges are generally marine and mostly symmetrical animals. 3. Sponges are primitive multicellular animals and have tissue level of organisation. Regarding 1,2 and 3:

asked Mar 20, 2014 by pady_1

1 answer

Segmentation: 1. In some animals the body is externally, but not internally divided into segments with a serial repetition. 2. The phenomenon is known as metamerism. 3. Earthworm shows this pattern called metameric segmentation. Regarding 1,2 and 3:

asked Mar 20, 2014 by pady_1

1 answer

Find the magnetic field at point P in the figure below, where I = 15 A and R = 20 cm.

asked Mar 14, 2014 by balaji.thirumalai

1 answer

A solenoid is 2.7-m long, has a radius of 0.85 cm, and has 600 turns. It carries a current I of 2.5 A. What is the magnitude of the magnetic field B inside the solenoid and far from either end?

asked Mar 14, 2014 by balaji.thirumalai

1 answer

An aircraft having a wingspan of $20.48\; m$ flies due north at aspeed of $40 ms^{−1}$. If the vertical component of earth’s magneticfield at the place is $2 × 10^{−5}\; T$, Calculate the emf induced betweenthe ends of the wings.

asked Mar 12, 2014 by balaji.thirumalai

1 answer

If an electron and a proton having same momentums enter perpendicularly to a magnetic field, then

asked Mar 3, 2014 by thanvigandhi_1

1 answer

An uniform electric field and an uniform magnetic field are acting along the same direction in a certain region. If an electron is projected along the direction of the fields with a certain velocity, then

asked Feb 28, 2014 by thanvigandhi_1

1 answer

In a region, steady and uniform electric and magnetic fields are present. These two fields are parallel to each other. A charged particle is released from rest in this region. The path of the particle will be a

asked Feb 28, 2014 by thanvigandhi_1

1 answer

Mark the correct option

asked Feb 27, 2014 by thanvigandhi_1

1 answer

Consider the following statements \[\] Statement 1: A proton enters a strong magnetic field along the field direction. Its path and velocity remain the same\[\] Statement 2: The field exerts no force on the particle

asked Feb 25, 2014 by thanvigandhi_1

1 answer

Consider the following statements \[\] Statement 1: A magnetic field interacts with a moving charge and not with a stationary charge \[\] Statement 2: A moving charge produces a magnetic field

asked Feb 25, 2014 by thanvigandhi_1

1 answer

Consider the following statements \[\] Statement 1: The energy of a charged particle cannot change in magnetic field \[\] Statement 2: If the magnetic field does not change with time, there is no induced electric

asked Feb 25, 2014 by thanvigandhi_1

1 answer

Consider the following statements \[\] Statement 1: The energy of a charged particle does not change in spatially varying magnetic field \[\] Statement 2: The instantaneous work done by magnetic field is zero

asked Feb 25, 2014 by thanvigandhi_1

1 answer

Consider the following statements \[\] Statement 1: The energy of a charged particle in a uniform magnetic field does not change \[\] Statement 2: Magnetic field does no work

asked Feb 25, 2014 by thanvigandhi_1

1 answer

Infinitely long wires parallel to the $y$ - axis are present in the $x-y$ plane at $x = 1, x = 2, x = 4$, and so on. The currents in all the wires with odd serial no is $1A $ in the $+y$ direction while it is $1A$ in the $–y$ direction for all the wires with even serial no. The magnetic field at the origin would be

asked Feb 25, 2014 by thanvigandhi_1

1 answer