What is the difference between a reflex action and walking?
Reflex action:- reflex action is a involuntary mechanism, spontaneous, automatic, rapid and mechanical response to the external stimuli on specific receptor without the will of an organism. eg. beating of heart, blinking of eyes, upward and downward movement of diaphragm during respiration.
Walking:- walking is a voluntary mechanism, slower than involuntary mechanism, occurs with the will of an organism. It requires brain involvement which sends the electrical signals to various body parts for the movement.
When a 12 V battery is connected across an unknown resistor, there is a current of 2.5 mA in the circuit. Find the value of the resistance of the resistor.
Outline a project which aims to find the dominant coat colour in dogs.
Draw the structure for the following compounds.
(i) Ethanoic acid (ii) Bromopentane*
(iii) Butanone (iv) Hexanal.
*Are structural isomers possible for bromopentane?
A hot plate of an electric oven connected to a 220 V line has two resistance coils A and B, each of 24 Ω resistance, which may be used separately, in series, or in parallel. What are the currents in the three cases?
How is the sex of the child determined in human beings?
(a) What property do all elements in the same column of the Periodic Table as boron have in common?
(b) What property do all elements in the same column of the Periodic Table as fluorine have in common?
Calculate the number of electrons constituting one coulomb of charge.
What is an homologous series? Explain with an example.
Why is variation beneficial to the species but not necessarily for the individual?
A man with blood group A marries a woman with blood group O and their daughter has blood group O. Is this information enough to tell you which of the traits – blood group A or O – is dominant? Why or why not?
How do we detect the smell of an agarbatti (incense stick)?
Outline a project which aims to find the dominant coat colour in dogs.
Why are some substances biodegradable and some non-biodegradable?
What will be the formula and electron dot structure of cyclopentane?
A positively-charged particle (alpha-particle) projected towards west is deflected towards north by a magnetic field. The direction of magnetic field is
(a) towards south (b) towards east
(c) downward (d) upward
Did Döbereiner’s triads also exist in the columns of Newlands’ Octaves? Compare and find out.
What processes would you consider essential for maintaining life?
What happens to the image distance in the eye when we increase the distance of an object from the eye?
Find out the source of water in your region/locality. Is water from this source available to all people living in that area?
Compounds such as alcohols and glucose also contain hydrogen but are not categorised as acids. Describe an Activity to prove it.