IGCSE Biology Paper-3: Specimen Questions with Answers 318 - 320 of 358

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Passage

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

Type of Tissue

Question 318 (3 of 4 Based on Passage)

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Short Answer▾

Name the part labelled A in Fig. 13.1.

Explanation

Vessel Element of Xylem

Structure of Vessel Elements

Xylem 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)

Question 319 (4 of 4 Based on Passage)

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Short Answer▾

The cells in this tissue do not contain some of the structures found in most plant cells.

State one structure that is missing from the tissue shown in Fig.

Explanation

Xylem sap consists mainly of water and inorganic ions, although it can also contain a few organic chemicals as well. The transport is passive, not powered by energy spent by the tracheary elements themselves, which are dead by maturity and no longer have living contents.

Passage

Leaves are made of tissues.

Question 320 (1 of 6 Based on Passage)

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One Liner▾

Describe the functions performed by root hair cells?

Explanation

The main function of root hair is to find the gap between soil particles and facilitate the process of water absorption and nutrient minerals. Water and nutrients that have been absorbed are then taken to other parts of the plant roots. Acid is secreted by this root hair. Acid will help dissolve nutrient minerals in the form of ions so that nutrient minerals are more easily transported and transported within the roots.

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