Bridge course 8th science

Test number 1

Q1  write the answer to the following questions.

1)Complete the following chemical equations.

Answer:6co2+ 6H2o Sunlight  C6H12o6 +6o2

                                 Chlorophyll

2)Write the the two examples of chemical Preservatives

Answer: 1) acetic acid

              2) citric acid

3)Identify who I am? And what kind  of

Nutrition would you include me in?

 I live in the hair on my head and get my foot by

observing blood.

 answer: ecto parasite , lice.

Q2)Write the answer to the following questions.

1) what precautions should you take while buying

food in airtight containers/ bags? Why?

 Answer :check the packing of containers.

check the expiry date off containers
 check the time span to use the product
within the time.

 because sometimes  microbes  grow in it 

they cause Ham to use .

2)Divide the amount given in parentheses Into scalar and

Vectors quantity 

(Area, velocity,  weight ,Move, displacement, distance,

mass)

   Scalar  quantity :Distance,  mass, area.

Vectors quantity :Displacement, velocity, weight,

move

3)Why does this happen? If the cold water bottle is

taken Out of the fridge and kept outside, water

drops on the outer surface of the Bottle appear 

to  have accumulated.

Answer: the cold water bottle temperature is

  lower  than Room temperature when vapou

r in air come contact with the bottle surface

it gets  condense. due to Tu tu condensatron

of vapour water Drop accumulated On the

bottle surface. 

4)What is the property of water shown in the picture

called? How does it benefit aquatic animals?

 answer: the property is anomalous Behaviour

of water due to this property when temperature

of water fall down To  zero degree celsius it

become  ice, but water below the layer of ice

semaine  4 degree Celsius this 4 degree celsius

temperature help aquatic animals to

survive in cold segron.

Q3)Write the answer to the following questions.

1) identify the name of the plant in the picture.

explain what adaptations have been made

to the trunk, roots And leaves in order to

survive in a desert or low- water region.

Answer: The name of the plant in the picture  is cactus .

It is a desert plant.

 adaptation:  trunk is fleshy To  Store water

and food.

Roots penetrate Dip in soil in search of water.

 leave either  absent or needle like to

reduce evaporation.

2) write the answer to the question by

  observing the accompanying  picture.

i)Write the name of part A and part B

 Answer:  A- a leaf Apex

 B-  stipule

ii) what is the type of  leaf?

 Answer:  the type of leaf is a simple  leaf.

iii)What is the structure of leaf veins ?

Answer: the structure of leaf seticulate venation