Tag: option a: neurobiology and behaviour
Questions Related to option a: neurobiology and behaviour
Bat can travel with
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Eyes open
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Eyes plugged and ears open
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Ears plugged and eyes open
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Ears closed and eyes plugged
Biosonar or sonar system helps bats to detect distant objects by echolocation. These organisms emit high-pitched sounds that bounce off objects in its path and produce an echo back. They respond rapidly to the echo and skillfully avoid obstacles and captures prey. Since they use only sonar system, not the vision, bats can travel with eyes plugged and ears open.
Otolith (otoconia) are CaCO$ _3$ particles found in the
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Perilymph
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Endolymph
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Bones
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Vitreous humour
An otolith, also called statoconium or otoconium, is a structure in the saccule or utricle of the inner ear, specifically in the vestibular labyrinth of vertebrates. They are sensitive to gravity and linear acceleration. In mammals, otoliths are small particles, composed of a combination of a gelatinous matrix and calcium carbonate in the endolymph of the saccule and utricle. The inertia of these small particles causes them to stimulate hair cells, when the head moves.
Eye and ear are the examples of
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Telereceptors
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Gustatory receptors
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Exteroreceptors
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Interoreceptors
A sensory receptor such as a visual receptor or an auditory receptor, that can be stimulated by distant stimuli and that mediates a far sense is called as telereceptor.
Ear dust is not situated in endolymph of
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Utriculus
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Ampulla
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Sacculus
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Endolymphatic sac
While semicircular canals respond to angular acceleration in specific directions, hair cells in the utricle and saccule respond to linear accelerations. The utricle and saccule are sac-like structures, that contain a patch of sensory hair cells called as the macula. The hair cells in the macula, which are similar to those in the cristae, are embedded in the otolith (ear stone) membrane, a gelatinous structure, that contains a large number of hexagonal prisms of calcium carbonate called as otoconia (ear dust).
Which part of the human ear converts pressure variations into electrical signals?
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Eustachian tube
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Auditory nerve
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Ear drum
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Cochlea
When the pressure variations strike the ear, they find their way through the external auditory canal to the tympanic membrane, setting it into vibration. The signal is thus converted to mechanical vibrations in solid matter. These vibrations of the tympanic membrane are transmitted to the ossicles, which in turn transmit them to the cochlea. Here, the signal undergoes a second change of nature, being converted into pressure variations within the liquid. These are then transformed again by specialised hair cells, which convert the liquid waves into nervous signals. Inside the cochlea, the tectorial membrane moves along with the pressure variations of the cochlear fluid. This membrane is in contact with the cilia on the top of the hair cells. There are two kinds of hair cells. The outer hair cells are the actual receptors. When the tectorial membrane moves, so does the hair on the outer cells. This movement is then encoded into electrical signals and goes to the brain through the cochlear nerve.
How many coils are present in cochlear duct of rabbit?
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$\displaystyle 2 \frac{1}{2}$
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$\displaystyle 2 \frac{3}{4}$
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$\displaystyle 1 \frac{1}{2}$
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$\displaystyle 1 \frac{1}{4}$
The cochlea is the auditory portion of the inner ear. It is a spiral-shaped cavity in the bony labyrinth, in rabbit making 2.5 turns around its axis, the modiolus. A core component of the cochlea is the organ of Corti, the sensory organ of hearing.
An instinct is
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Caring for offspring
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Habituation
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Operant conditioning
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Associative behavior
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Observational learning
- Instinct is the natural force that causes a person or animal to behave in a particular way without thinking or learning about it.
- In almost every species of animals, caring for offsprings until they are mature enough is seen.
Which of the following is the most simplest form of learned behaviour?
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Dominance
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Reflex
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Instinct
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Imprinting
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Habituation
Instinct is an innate, typically fixed pattern of behaviour in animals in response to certain stimuli. An instinct is something that doesn't need to learn and it happens naturally, without even thinking about it and so is the simplest form of learned behaviour.
Colostrum, the first milk secretion of mammary gland of cow, is rich in immunoglobin
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IgE
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IgM
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IgA
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IgG
Colostrum is produced in the initial secretions of the mammary gland following the birth of offspring. Colostrum is most commonly distinguished from whole milk because it contains high concentrations of immunoglobulins (Ig), otherwise known as antibodies. Antibodies are proteins which function to identify and destroy disease-causing pathogens in livestock. The primary immunoglobulin in cow colostrum and milk is IgG, whereas the primary immunoglobulin in human milk is IgA. Colostrum is also a vital source of growth factors and nutritional elements such as protein, fat, milk sugar, vitamins and minerals.
Raj was swimming in a pond. When he walked back to his car, he noticed that several newly hatched ducklings were following his moves. Which among the following explains it correctly?
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Tropism
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Conditioning
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Sympathetic nervous system
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Associative learning
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Imprinting
- Tropism is referred to as the response to a stimulus.
- Conditioning is a behavior where the response comes from frequent predictable consequences.
- The sympathetic nervous system regulates the unconscious actions.
- Associative learning is when a new response becomes associated with a particular stimulus.
- Imprinting is a way of learning at a certain phase of life in which the organism follows the surrounding environment. It is generally seen at the early hours of a newborn. It helps in the vocational development of organisms.