Gr 3rd Sub: EVS Ch 5 and Ch 18 Revision - Give Reasons and Name the following

                                                         Give Reasons

a) Leaves are green in colour.

Ans: Because of the presence of chlorophyll

 

b) Climbers grow along nearby trees, fences or buildings.

Ans: Climbers have tender and weak stems and cannot stand on their own. So they need support to grow.

c) Leaves are called food factory.

Ans: The leaf prepares food for the whole plant so they are called as food factory.

d) The stem supports the plant above the ground. Give reasons

Ans: As it connects the roots to the other parts of plants such as leaves, flowers, leaves, buds and fruits.

e) Historians use timelines. Give reason

Ans: Historians use timelines to display different events.

 

f) Is a timeline important. Explain

Ans: A timeline is important to draw a complete picture of history. It also helps us to understand time lapses between events.

 

g) Explain who is historian.

Ans: A person who studies history or the past is called historian.

 

                                            Name the following

a)    An event that may happen in time to come is – Future event

b)    An event that is happening now is called – Present event

c)     An event that has already taken place in our life is – Past event

d)    It is a representation of events over a period of time – timeline

e)    BC stands for – Before Christ

f)      BCE stands for – Before Common Era or Before Christian Era

g)    Here the years are counted forward – Anno Domini

h)    Here the years are counted backward – Before Christ

i)       The leaf is used to serve food – Banana Leaf

j)       It contains baby plant in them - Seed

k)    It protects the seed inside it – Fruit

l)       They are colourful and have sweet smell to attract insects, animals and birds – Flowers

m) It have tender and weak stem – Climbers

          n) It supports the plant above the ground – Stem