Science Practical (C10)

Name the process by which an amoeba reproduces

Name the process by which an amoeba reproduces. Draw the various stages of its reproduction in a proper sequence.

A student observed a permanent slide showing asexual reproduction in yeast

A student observed a permanent slide showing asexual reproduction in yeast. Draw diagrams of the observations he must have made from the slide. Name the process also.

A teacher provided acetic acid, water, lemon juice, aqueous solution

A teacher provided acetic acid, water, lemon juice, aqueous solution of sodium hydrogen carbonate and sodium hydroxide to students in the school laboratory to determine the pH values of these substances using pH papers. One of the students reported the pH values of the given substances as 3, 12, 4, 8 and 14 respectively. Which one of these values is not correct ? Write its correct value stating the reason.

Placing duly cleaned strips of aluminium, copper, iron and zinc

What would a student report nearly after 30 minutes of placing duly cleaned strips of aluminium, copper, iron and zinc in freshly prepared iron sulphate solution taken in four beakers ?

What is observed when a pinch of sodium hydrogen carbonate

What is observed when a pinch of sodium hydrogen carbonate is added to 2 mL of acetic acid taken in a test tube ? Write chemical equation for the reaction involved in this case.

After examining a prepared slide under the high power

After examining a prepared slide under the high power of a compound microscope, a student concludes that the given slide shows the various stages of binary fission in a unicellular organism. Write two observations on the basis of which such a conclusion may be drawn.

List four steps of obtaining germinating dicot seeds

List in proper sequence four steps of obtaining germinating dicot seeds.

List four precautions while preparing a temporary mount of a leaf peel

List four precautions which a student should observe while preparing a temporary mount of a leaf peel to show stomata in his school laboratory.

The current flowing through a resistor connected in a circuit

The current flowing through a resistor connected in a circuit and the potential difference developed across its ends are as shown in the diagram by milliammeter and voltmeter readings respectively:

1. What are the least counts of these meters ?
2. What is the resistance of the resistor ?

Draw a path of light ray passing through a prism

Draw a path of light ray passing through a prism. Label angle of incidence and angle of deviation in the ray diagram.