IGCSE Biology Paper-3: Specimen Questions with Answers 313 - 314 of 358
Passage
Fig. is a drawing of a cross-section of a root.
Question 313 (1 of 3 Based on Passage)
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Short Answer▾Identify and label the structures on Fig. 28.1 using label lines and the labels:
- root hair
- phloem
- xylem.
Explanation
- Root hair cells are adapted for taking up water and mineral ions by having a large surface area to increase the rate of absorption.
- Xylem is the specialized tissue of vascular plants that transports water and nutrients from the plant – soil interface to stems and leaves, and provides mechanical support and storage. The water-conducting function of xylem is one of the major distinguishing features of vascular plants.
- Phloem is the vascular tissue in charge of transport and distribution of the organic nutrients. The phloem is also a pathway to signaling molecules and has a structural function in the plant body.
Question 314 (2 of 3 Based on Passage)
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Short Answer▾The list shows some of the structures in a plant.
Write the structures in order of size from smallest to largest.
Explanation
In order of increasing complexity, multicellular organisms like plants consist of:
Structure | Description |
Organelle | Cell structure that is specialized to carry out a particular function or job |
Cell | Basic structural and functional unit of a living organism |
Tissue | Group of cells with similar structures, working together to perform a shared function |
Organ | Structure made up of a group of tissues, working together to perform specific functions |
Organ system | Group of organs with related functions, working together to perform body functions |