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प्रश्न
Which part of the eye contains cells which are sensitive to light?
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उत्तर १
The retina of an eye contains light-sensitive cells.
उत्तर २
The retina is the part of the eye which contains cells that are sensitive to light.
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संबंधित प्रश्न
Which part of the brain maintains posture and equilibrium of the body?
When you smell a favourite food your mouth begins to water (that is, you secrete saliva). Write down what is the example of the gland which is stimulated to secrete saliva.
Cerbellum, medulla and pons are the parts of :
(a) mid-brain
(b) hind-brain
(c) forebrain
(d) spinal cord
The contraction of pupil of the eye in the presence of bright light is an example of :
(a) Voluntary reflex
(b) Spinal reflex
(c) Cerebral reflex
(d) Adrenal reflex
Your are driving your bicycle at a fast speed. Suddenly, a small boy comes in front of your cycle and, without wasting any time in thinking, you immediately apply the brakes and accident is avoided. What name is given to such an action?
State whether the following is simple reflex, conditioned reflex or neither of the two:
Lifting up a book: …………………..
Two hungry boys (A and B) enter a restaurant and find a table decorated as follows:
Boy B starts salivating but not A. Explain the reason for this difference.
List in tabular form three distinguishing features between cerebrum and cerebellum.
State whether the following is simple reflex, conditioned reflex or neither of the two.
Blushing
State whether the following is simple reflex, conditioned reflex or neither of the two.
Knitting without looking
State whether the following is
The sudden application of brakes without thinking
State whether the following is
Playing on the Keyboard
What type of reflex is the following?
Sweating in summer
Give Reason:
The hand automatically shows the direction to turn a cycle without thinking.
Complete the following sentence with appropriate Word
Which of the following is not a natural reflex action?
In reflex action, the reflex arc is formed by ______
Give an example for conditioned reflexes.
Categorise the following under stimulus and response.
Withdrawal of hand on touching a hot plate
The diagram given below shows the internal structure of a spinal cord depicting a phenomenon. Study the diagram and answer the following questions.
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- Name the phenomenon shown in the figure and define the same.
- Identify the parts labelled as 1 and 2. Write one functional difference between these two.
- Name the bony protective covering and the membranous protective covering of the spinal cord.
- Label the guidelines 3 and 4.
- How is the labelled part 3 different from part 4 with respect to its composition (part of neuron)?
- Give the technical term for the point of contact between the two nerve cells.
- Name the fluid filled inside the central canal of spinal cord.
- Name the term used for a small gap between two neurons.
- Give one example of a neurotransmitter.
- Draw a neat diagram of a nerve cell and label the parts: Perikaryon, Node of Ranvier, Myelin sheath and Axon terminals.
