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c. Answer the following questions in very short :-
21. Why do bees store flower nectar?
22. From which parts of the plant cotton and jute are obtained
23. What is retting?
24. What are the parts of a flower?
os 25. What are the five categories of plants?
26. Give two examples of reversible change.
27. What is winnowing?
28. Name two water soluble and water insoluble materials.
29. Name five objects which can be made from wood.
Answers
Answer:
Here is the answers...
Explanation:
21.Honey bees collect nectar as food. Nectar stored within their stomachs is passed from one worker to the next until the water within it diminishes. At this point, the nectar becomes honey and they store it in their honeycomb.
22.Cotton is obtained from the fruit part of plant and Jute is obtained from the stem of the plant.
23.Retting is a process employing the action of micro-organisms and moisture on plants to dissolve or rot away much of the cellular tissues and pectins surrounding bast-fibre bundles, and so facilitating separation of the fibre from the stem.
24.The main flower parts are the male part called the stamen and the female part called the pistil. The stamen has two parts: anthers and filaments. The anthers carry the pollen.
25.Plants are classified into 5 groups known as seed plants, ferns, lycophytes, horsetails, and bryophytes. Seed plants consist of a wide variety of plants that bear seeds to reproduce.
26. Melting and freezing.
27. Winnowing is an agricultural method developed by ancient cultures for separating grain from chaff. It can also be used to remove pests from stored grain.
28.Sugar and salt are examples of soluble substances.
Sand and flour are insoluble substances.
29. chair, sofa,almirah,table,Chairs,window,door,pencil.
Explanation:
21)Honey bees collect pollen and nectar as food for the entire colony, and as they do, they pollinate plants. Nectar stored within their stomachs is passed from one worker to the next until the water within it diminishes. At this point, the nectar becomes honey, which workers store in the cells of the honeycomb .
22) Cotton is obtained from the fruit part of plant and Jute is obtained from the stem of the plant.
23)Retting is a process employing the action of micro-organisms and moisture on plants to dissolve or rot away much of the cellular tissues and pectins surrounding bast-fibre bundles, and so facilitating separation of the fibre from the stem.
24)The main flower parts are the male part called the stamen and the female part called the pistil. The stamen has two parts: anthers and filaments. The anthers carry the pollen. These are generally yellow in color.
25)Based on these similarities, scientists are able to classify distinct plants into 5 groups known as seed plants, ferns, lycophytes, horsetails, and bryophytes. Seed plants consist of a wide variety of plants that bear seeds to reproduce.
26)Examples of reversible changes: Melting is when a solid converts into a liquid after heating. An example of melting is turning ice into water. Freezing is when a liquid converts into a solid.
27)Winnowing is an agricultural method developed by ancient cultures for separating grain from chaff. It can also be used to remove pests from stored grain. Winnowing usually follows threshing in grain preparation.
28)sand, fats, wood, metals, and plastic are water insoluble materials Salt, sugar are water soluble materials
29)chair , sofa , almira ,Table,Chairs,window,door,pencil.
Hope these answers are helpful