1. Define Geotropism and phototropism. Give one example of each of a plant and an animal for the same.
2. The camel survives in deserts. Imagine a camel being left in a polar region. What would happen to the camel?
3. What is activation energy? Give an example.
4. Why do desert animals live in burrows? Give a reason for your answer.
5. Sarah and Siya are discussing different living things. Sarah says that all the living things have skin, muscles, bones and cells. Do you agree with Sarah?
6. 100 kg = 1 quintal
7. Standard unit of :
Time:
Distance:
Mass:
Answers
Answer:
Ans1
The movement of plant parts in response to gravity is known as geotropism. The growth of plant roots is an example of geotropism.
Phototropism is the growth of plant parts in response to a light stimulus. During phototropism, the cells on the plant that are farthest from the light contain a chemical called auxin reacts, which causes the plant to have elongated cells on the furthest side from the light. Hence, shows the growth and movement toward light.
An example of phototropism is the growth of plant stem in the direction of sunlight (upward).
Ans2
Both of the animals are die because polar bear can't resist the heat in desert and camel can't any food for eat.
Ans3
They require a certain amount of energy just to get started. This energy is called activation energy. For example, activation energy is needed to start a car engine. Turning the key causes a spark that activates the burning of gasoline in the engine.
Ans4
Desert animals stay in burrows during day time because as the sand gets heated very quickly in the presence of sun. The animals stay inside the burrows to protect them from the excessive heat on the sand and keep themselves cool in the day time.
Ans5
The short answer is yes
Bones provide support for our bodies and help form our shape. Although they're very light, bones are strong enough to support our entire weight.
Ans6
To convert quintal into kilogram we multiply the magnitude by 100. Thus, one Quintal is equal to 100 kilograms
Ans7
Time: Second
Distance: Metre
Mass: Kilograms