There is a mutual attraction between ___________ poles of magnet.
Q.2 A magnet always has ____________poles.
Q.3 The nucleus at the centre of the atom has__________ and_______.
Q.4 A High energy electric discharge in the atmosphere is_____________.
Q.5 _________ is the property of a material that alloys it to shine .
Q.6________ is used in the laboratory to detect starch.
Q.7 Flowers that bear both the stamen and the pistil are called_____________ flowers.
Q.8 The male gamete is called _________
Q.9 The reaction of an organism to a stimulus is called a ___________
Q.10 Every organism begins its life from a single cell called the __________
Name the following
Q.11 The hormone secreted by the thyroid gland_________
Q.12 The swollen stem of ginger _________
Q.13 The process of economically extracting metal from its ore____________
Q.14 The method of charging an uncharged object by bringing it closer to a charged object__________
Q.15 A device that converts mechanical energy into electrical energy____________
Very short answer
Q.16 What is magnet?
Q.17 Where are the poles of a bar magnet located ?
Q.18 Define electroscope ?
Q.19 What is Static electricity?
Q.20 Define alloy?
Q.21 Name the ores of a
a. iron b. silver c. zinc
Q.22 Define reflec action?
Q.23 Define nervous system ?
Q.24 What is reproduction?
Q.25 Define seed dispersal?
Answers
Explanation:
ANSWER
Sometimes, we suddenly withdraw our body part when it comes in contact with objects which are very hot, cold, pointed or animals that are poisonous.
This entire process of response to the peripheral nerve stimulation, that occurs involuntarily is called reflex action.
It has the following five components :
1) Receptor - It is a cell/tissue/organ which receives a stimulus.
2) Sensory/Afferent Nerve Fibres - These take the sensory impulses generated by the receptor to the central nervous system.
3) Part of Central Nervous System - It may be spinal cord or brain.
4) Motor/ Efferent Nerve Fibres - These carry the motor impulse generated in the CNS to specific effectors.
5) Effector Organ - It may be an organ/ muscle/ gland which on being activated by a motor impulse help to deal with the stimulus.