IGCSE Biology Paper-3: Specimen Questions with Answers 315 - 316 of 358

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Passage

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

Cross Section of a Root

Question 315 (3 of 3 Based on Passage)

Write in Short

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

Passage

Fig. is a drawing of a piece of plant tissue.

Type of Tissue

Question 316 (1 of 4 Based on Passage)

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Short Answer▾

What name is given to this type of tissue?

Choose your answer from the list.

Explanation

  • Xylem: The term xylem was first used by Nageli (1858) . Xylem is a conducting tissue which conducts water and mineral nutrients & is composed following:
  • Tracheid՚s: Term given by Sanio (1863) . They are elongated tubelike cells with tapering or rounded or oval ends and with hard and lignified walls. The cells are without protoplast and are dead on maturity. Tracheid՚s possess bordered pits. Maximum bordered pits are formed in gymnospermous tracheid՚s They also possess various kinds of thickenings, e. g. annular, spiral, scalariform, reticulate or pitted tracheid՚s.
  • Tracheae or Vessels: Vessels are rows of elongated tube-like cells, placed end to end with their end walls dissolved. Vessels usually do not occur in Pteridophyta and Gymnospermous xylems but in Pteridium, Selaginella (both Pteridophytes) and in Ephedra, Gnetum (Gymnosperms) vessels are present. In Angiosperms vessels are always present (Except Lotus, Wintera, Trochodendron)
  • Wood fibers: The long, slender, pointed, dead and sclerenchymatous cells. They possess mostly thickened walls and few small pits. They said the mechanical strength.
  • Wood (Xylem) parenchyma: The parenchyma cells which very frequently occur in xylem are termed wood parenchyma.

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