Biology Times 07.2019
Which one of the following is incorrect about the characteristics of protobionts as envisaged in the abiogenic origin of life? ...
(d) A higher percentage of light and dark moths were recaptured in the country compared to light and dark moths recaptured in th ...
iii. The potato and sweet potato are the examples of homology (a) ii and iii correct (b) i and ii correct (c) i and iii correct ...
An Australian mole is actually a marsupial rather than a placental animal like the North American or European mole. The two ani ...
In a hypothetical human population in Hardy-Weinberg equilibrium, the frequencies of the alleles IA, IB and i are respectively ...
(b) The skull of modern human resembles more closely to baby chimpanzee (c) Homo erectus lived in east and central Asia and used ...
becomes thicker. (d) Sea weeds include multicellular algaes and they are too soft to fossilize. (a) (b) Gene pool is the set of ...
Introduction The nervous system is the part of an animal that coordinates its actions by transmitting signals by nerve impulses, ...
Nervous system in Nematodes: Four peripheral nerves run the length of the body on the dorsal, ventral and lateral surfaces. The ...
Nervous System in arthropoda: The arthropod nervous system consists of a dorsal brain and a ventral, ganglionated longitudinal ...
The central nervous system consists of brain and spinal cord. The peripheral nervous system consists of sensory and motor nerve ...
Dendrites: Short fibres which branch repeatedly and project out of the cell body also contain Nissl’s granules and are called de ...
and are also called motor neurons. (c) Interneurons connect neurons within specific regions of the central nervous system. Affer ...
Conduction of nerve impulse Across synapse In a synapse, there is a narrow fluid-filled gap of 10-20 nm, called synaptic cleft. ...
The Brain Brain is a highly specialised delicate organ located in skull or cranium. It is about 1.4 kg. Brain is covered by thre ...
These regions called as the association areas are responsible for complex functions like intercessory associations, memory and c ...
It does not initiate movement, but contributes to coordination, precision, and accurate timing. It receives input from sensory ...
ventricle in the pons and medulla. The fourth ventricle continues with the central canal of the spinal cord. Three openings in t ...
Peripheral Nervous System: The nervous system outside the brain and spinal cord.The PNS consists of the nerves and ganglia outsi ...
Autonomic Nervous System (ANS): Autonomic nervous system controls and co-ordinates the various activities of visceral organs. He ...
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