IGCSE Biology Paper-3: Specimen Questions with Answers 313 - 314 of 358

Passage

Fig. is a drawing of a cross-section of a root.

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

T. S. Of Root
  • 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.

Phloem Tissue

Explanation

Multicellular Organism

In order of increasing complexity, multicellular organisms like plants consist of:

In Order of Increasing Complexity, Multicellular Organisms like Plants Consist Of
StructureDescription
OrganelleCell structure that is specialized to carry out a particular function or job
CellBasic structural and functional unit of a living organism
TissueGroup of cells with similar structures, working together to perform a shared function
OrganStructure made up of a group of tissues, working together to perform specific functions
Organ systemGroup of organs with related functions, working together to perform body functions