8. Answer the following question in short. (any 8)
i) How many whorls are commonly found in a flower ? Name them.
ii) What is the function of calyx ?
iii)Give two example of liquid-liquid solution.
iv) Why solids materials hard?
) Why are scavengers important?
vi) How do animals help plants ? List two ways.
vii) Name the four sounds that we make without speaking.
viii) What are warning sounds?
ix) Why is stigma sticky in nature?
9. Answer the following question in details.(any 6)
6X3=18
i) How does cross pollination happen?
ii) Name the part of the flower where pollen grains are stored? What is the role of pollen grains in plant
reproduction?
iii) What cause sea breeze?
iv) How are plants and animals interdependence?
v) What are the harms done by deforestation?
vi) What are the harms of noise pollution?
vii) In what ways can we reduce noise pollution?
5
10. Answer any one of the given question with diagram.
i) How does water change its state in three forms? Explain with the help of a diagram.
ii)Describe the structure of a pistil. Support your answer with a diagram,
Answers
Answer:
8i) Four types of whorls are commonly found in a flower, they are calyx, corolla, androecium, gynoecium.
ii) Calyx help to protect the plant reproductive organs.
iv) Because the molecules in the solid are closely fitted together.
v) Scavengers breakdown the organic material and hence plays an important role in the ecosystem.
ix) Stigma is the reproductive part of a flower, it is sticky in nature so that it can hold the pollen.
9 ii) Anther,
Pollen in plants are used for transferring haploid male genetic material.
iv) Plants and animals are interdependence on each other for many reasons
* Plants provide shelter for animals and also provide food for them.
* When animals die they decompose and become natural fertilizer for plants.
* Plants depend on animals for pollination, seed dispersal etc.
vii) By decreasing the sound of television
By talking slowly over the phone
By turning off appliances when not in use