Question

7. Which of the followin-metal is good conductor of electricity
a) Aluminum
b) silicon
c) graphite d) gold
8. Sieve tubes and companion cells are present in
a) Xylem b) Phloem
c) cork
d) cambium
QII. Answer the following question 1-2 sentences
8x1=8
1. What are the two components of colloidal solution ?
2. Define the term sublimation.
3. Name the process which occurs when drops of dettol added to water.
4. What is isotonic solution ?
5. Name the protein responsible for contraction and relaxation in muscles.
6. What do you understand by motion of an object?
7.Name the metal which exist in liquid state at room temperature.
8. Give few examples of homogeneous mixture (solution).
8x2=16
QIII.Answer the following questions in 3-4 sentences (any 8)
1. Write the difference between mixtures and compounds.
2. Describe the properties of colloidal solution.
3. What are involuntary muscles? Where are they found?​

Answer 1

7) a)

8) b

1. dispersed phase and dispersing
2. is the translation of substance directly from the solid to the gas state without passing to the liquid state .
3. when a drop of dettol is added in water diffusion takes place
4. isotonic solution contains equal concentrations of impermeable solubles on Ada side of the membrane and so the cells nature swells aand. sinks .
5. actin filaments , usually in Association with myosin , a respnsible for many types of cell moments .
6. motion is the phenomena in which an object changes its position over time .
7. mercury
8. examples are oil and water

.

1.

compound

• compound a substance which can be formed by chemically combining two or more elements .
• examples of water ,salt ,baking soda

mixture

• mixtures are substance that are formed by physically mixing to or more substance .examples are oil and water, sand and water

2) I'd know sorry

3 ) involuntary muscles are the muscles which contract with without conscious control the concentration is controlled by the automatic nervous system they are present in the walls of digestive system blood vessels bronchial uterus and bladder .

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