Why do trees have bark?
What are the modifications of root ? give examples .
What are the functions of the shoot ?
Why do cactus plants have spines ?
What are non-flowering plants ?
Please answer all these questions in two sentences.
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Answers
1.
Bark is the outermost covering of a tree's trunk and branches, like a protective skin. Tree bark conserves water and also serves to protect the tree's essential living systems from environmental and situational dangers. These include temperature extremes, storms, attacks by animals, diseases, and insects.
2.
In some plants, the roots change their shape and get modified to absorb and transport water and minerals from the soil to different parts of the plant. They are also modified for support, food storage, and respiration.
3..
The shoot is the production center for a plant. It is the organ system that gives rise to stems, leaves, and flowers. Therefore, the shoot system is functionally responsible for food production (photosynthesis) and reproduction. Shoots can be classified as vegetative or floral.
4.
Over time, those leaves evolved into the spiky spines we see on cactuses today because they help the plants survive in hot, dry environments. "They can be a defense mechanism to discourage herbivores - animals that eat plants - from eating the cactus. But, also, spines create shade!" explains Kimberlie McCue.
5.
Non-flowering plants include mosses, liverworts, hornworts, lycophytes and ferns and reproduce by spores. Some non-flowering plants, called gymnosperms or conifers, still produce seeds.
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