Natural Resources — Science STD 9 — Question

Amoeba has a contractile vacuole for:

1. Osmoregulation.
2. Storage.
3. Turgidity.
4. Gaseous exchange.

Harelip is a:

1. Acquired disease.
2. Infectious disease.
3. Metabolic disease.
4. Congenital disease.

Name the non-nucleated blood cells.

The speed of highly penetrating ultrasonic waves is:

1. Lower than those of audible sound waves.
2. Higher than those of audible sound waves.
3. Much higher than those of audible sound waves.
4. Same as those of audible sound waves.

Four students A, B, C and D verified the law of conservation of mass by performing chemical reaction between barium chloride and sodium sulphate. All of them took 107.2g barium chloride solution and 116.1g of sodium sulphate solution and mixed them in the beaker of mass 150g. They reported their results as follows:

Students	Colour of reaction mixture after mixing	Mass of reation mixture in the beaker including mass of beaker
A	White Precipitate	383.3g
B	Brown Precipitate	393.3g
C	White Precipitate	373.3g
D	Brown Precipitate	363.3g

The correct observation is that of student.

Name the property of matter due to which a body continues to be in its state of rest or uniform motion unless an external force acts on it:

Find out the correct sentence about manure.

1. Manure contains large quantities of organic matter and small quantities of nutrients.
2. It increases the water holding capacity of sandy soil.
3. It helps in draining out of excess of water from clayey soil.
4. Its excessive use pollutes environment because it is made of animal excretory waste.

1. (i) and (iii)
2. (i) and (iii)
3. (ii) and (iii)
4. (iii) and (iv)

Trapped dust particles are pushed out of respiratory tract by:

1. Ciliated epithelium.
2. Stratified epithelium.
3. Sensory epithelium.
4. Glandular epithelium.

In poultry farms, broilers are raised for their:

The mass of object A is 5kg, that of object B is 40kg, that of object C is 38kg, and that of object Dis 56kg. Which object has the greatest inertia?