What is the difference between the manner in which movement takes place in a sensitive plant and the movement in our legs?
sensitive plants- they are sensitive to touch, mostly their leaves like a plant chui mui (shows quick fold inward or droop when we touch their leaves). And they do not have special proteins for the movement they show only growth pattern.
Movement in our legs:- this is a voluntary action which depends on our willingness. They have special protein and muscles to contract by which they are able to walk or run. The nerve impulses sends to the brain and the brain sends signals the various body parts for the voluntary or as well as involuntary actions.
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 does the creation of variations in a species promote survival?
What is the role of the seminal vesicles and the prostate gland?
Why is the use of iodised salt advisable?
A student has difficulty reading the blackboard while sitting in the last row. What could be the defect the child is suffering from? How can it be corrected?
Which gas is usually liberated when an acid reacts with a metal? Illustrate with an example. How will you test for the presence of this gas?
Oil and fat containing food items are flushed with nitrogen. Why?
What type of oxides are formed when non-metals combine with oxygen?
Pratyush took sulphur powder on a spatula and heated it. He collected the gas evolved by inverting a test tube over it, as shown in figure below.
(a) What will be the action of gas on
(i) dry litmus paper?
(ii) moist litmus paper?
(b) Write a balanced chemical equation for the reaction taking place.
Why are coils of electric toasters and electric irons made of an alloy rather than a pure metal?
Food cans are coated with tin and not with zinc because
(a) zinc is costlier than tin.
(b) zinc has a higher melting point than tin.
(c) zinc is more reactive than tin.
(d) zinc is less reactive than tin.