Plant Tissues, Organs And Systems
Overview
A leaf is a few tenths of a millimetre thick and has to do three incompatible things at once: catch as much light as possible, let carbon dioxide in, and avoid drying out in the sun that provides the light. The way it is layered is the compromise, and every layer is there for a reason you can work out rather than memorise.
In this lesson you will name the plant tissues this course asks for, slice through a leaf and account for each layer, and learn where the xylem and phloem sit in a root and in a stem. That last detail is small, easily forgotten and reliably examined. Along the way you will meet the pores in the lower surface of a leaf, which the specimen paper hands to you in a question stem and then asks you to count.
Objectives
- Examples of plant tissues include: epidermal tissues, which cover the plant; palisade mesophyll, which carries out photosynthesis; spongy mesophyll, which has air spaces to facilitate diffusion of gases; xylem and phloem, which transport substances around the plant.
- Plant organs include stems, roots and leaves. Details of the internal structure of these organs are limited to the leaf and to the position of the xylem and phloem in a dicotyledonous primary root and primary stem.
Mind map
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Lesson Note
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Lesson Evaluation
Congratulations on completing the lesson on Plant Tissues, Organs And Systems. Now that youve explored the key concepts and ideas, its time to put your knowledge to the test. This section offers a variety of practice questions designed to reinforce your understanding and help you gauge your grasp of the material.
You will encounter a mix of question types, including multiple-choice questions, short answer questions, and essay questions. Each question is thoughtfully crafted to assess different aspects of your knowledge and critical thinking skills.
Use this evaluation section as an opportunity to reinforce your understanding of the topic and to identify any areas where you may need additional study. Don't be discouraged by any challenges you encounter; instead, view them as opportunities for growth and improvement.
- Which plant tissue carries out most of the photosynthesis in a leaf? A. Epidermal tissue B. Palisade mesophyll C. Spongy mesophyll D. Phloem Answer: B
- What is the function of the air spaces in the spongy mesophyll? A. To store water B. To strengthen the leaf C. To facilitate the diffusion of gases D. To absorb light Answer: C
- Which plant tissue covers the plant? A. Phloem B. Xylem C. Palisade mesophyll D. Epidermal tissue Answer: D
- Where are the xylem and phloem found in a dicotyledonous primary root? A. In a ring near the outside B. In the centre C. Just below the epidermis D. Scattered evenly throughout Answer: B
- Which of these is a plant organ? A. Palisade mesophyll B. Xylem C. A leaf D. A chloroplast Answer: C
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