B. Answer the following questions in detail:
1. How are roots, stems and leaves of different plants modified for providing additional support? Give examples
2. Discuss the various functions carried out by the roots and stem of a typical plant.
3. Explain the structure of a typical flower.
4. Describe the ways in which different flowers vary from each other.
5. How does a seed develop into a plant? What are the functions of its parts? .
Answers
Explanation:
Cartography, the art and science of graphically representing a geographical area, usually on a flat surface such as a map or chart. It may involve the superimposition of political, cultural, or other nongeographical divisions onto the representation of a geographical area.
Answer:
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Explanation:
Stilt roots - are adventitious roots arise from around the base of the main stem of a plant and help in the mechanical support.-Zea mais .and in pandanaceae and in Rhizophoraceae.
Prop roots are aerial roots arise from the branches of huge branches to give additional support .
Clasping roots in epiyphytes for fixing the plant to the supporting plants .
The functions of root are as follows:
Anchoring of the plant to the soil
Absorption of water and nutrients from the soil
Conduction of absorbed water and nutrients to stem
Storage of food
Vegetative reproduction and competition with other plants
The primary functions of the stem are to support the leaves; to conduct water and minerals to the leaves, where they can be converted into usable products by photosynthesis; and to transport these products from the leaves to other parts of the plant, including the roots.
A flower is the reproductive structure found in flowering plants. A typical flower contains the following parts:
(1) Stalk- The part by which a flower is attached to the branch is called stalk.
(2) Sepals- The small, green colored, leaf shaped structures found on the outermost part of the flower are called sepals. They are considered to be modified leaves. They protect the flower when they are in the stage of bud and support the petals when in bloom.
(3) Petals- Petals are colored, modified leaves that surround the reproductive parts of flowers. They are brightly colored or unusually shaped to attract insects for pollination.
(4) Stamen- Stamen is the pollen- producing, male reproductive organ of a flower. Stamen usually consists of a long slender stalk, the filament, with the anthers at the tip.
(5) Pistil - Pistil is the ovule producing, female reproductive part of a flower. It is the innermost part of a flower. The pistil consists of three parts: stigma, style, ovary
Some flowers have both male stamens and female pistils within the same flower and it is possible for self-pollination to occur. Other flowers are either male with only stamens, or females, with only pistils.
The seed in a plant is the part that develops from the ovules after fertilization. They are enclosed in the fruit which develops from the fertilized ovary. The seeds are formed as a result of sexual reproduction and contain the young embryo which can develop into a new plant.