The mammalian heartis called myogenic (myo = muscle, genie = originating from). It means the heart beat or the activities of the heart are auto regulated which originates from a muscle called nodal tissue.In the human heart,heartbeat originates and contraction is initiated by a special modified heart muscle known as sinoatrial node. It is located in the right atrium; while the QRS waves are the depolarisation of the ventricles, which initiates the ventricular contraction.The T-wave represents the repolarisation,that is, the return of the ventricles from excited tonormal state.Hepatic portal system is the unique vascular connection that exists between the digestive tract and liver. This vein carries blood from intestine to the liver.
Which one of the following statements with regard to volcanoes is not correct?
A) Stratovolcanoes produce lava flows that initially follow valleys but are highly resistant to erosion.
B) The surrounding areas can remain highlands, lava ridges or mesas.
C) Hawaiian shield volcanoes are eroded by steams that form deeply carved valleys with steeply sloping heads.
D) The system of streams on a dissected volcano cone is not a radial drainage pattern.
A) Stratovolcanoes produce lava flows that initially follow valleys but are highly resistant to erosion.
B) The surrounding areas can remain highlands, lava ridges or mesas.
C) Hawaiian shield volcanoes are eroded by steams that form deeply carved valleys with steeply sloping heads.
D) The system of streams on a dissected volcano cone is not a radial drainage pattern.
Answer & ExplanationAnswer: D) The system of streams on a dissected volcano cone is not a radial drainage pattern.
Explanation:
Stratovolcano, also known as acomposite volcano, is aconical volcanobuilt up by many layers (strata) of hardened lava, tephra, pumice and ash. Because it is stratified, therefore it will definitely form a volcano cone.
Loktak Lake:the largest freshwater (sweet) lake in North -East India, also called the only Floating lake in the world due to the floating phumdis (heterogeneous mass of vegetation, soil, and organic matters at various stages of decomposition) on it, is located near Moirang in Manipur state, India. The etymology of Loktak is Lok = "stream" and tak = "the end"
The first model of atom was proposed by J. J. Thomson in 1898.According to this model, the positive charge of the atom is uniformly distributed throughout the volume of the atom and the negatively charged electrons are embedded in it like seeds in a watermelon. This model was picturesquely called plum pudding model of the atom
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