IGCSE Biology Paper-3: Specimen Questions with Answers 319 - 321 of 358

Passage

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

Type of Tissue

Question 319 (4 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)

Passage

Leaves are made of tissues.

Question 320 (1 of 6 Based on Passage)

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One Liner▾

Explain the importance of increasing humidity near the leaf surface.

Explanation

Relative Humidity

As the relative humidity of the air surrounding the plant rises the transpiration rate falls. It is easier for water to evaporate into dryer air than into more saturated air. Wind and air movement: Increased movement of the air around a plant will result in a higher transpiration rate.

Graph of Humidity

Question 321 (2 of 6 Based on Passage)

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Short Answer▾

Define the term tissue.

Explanation

Tissue

A group of structurally similar or dissimilar cells that perform a common function and have a common origin is called a tissue. A plant is made up of different kinds of tissues. The complex tissues are, however, composed of different kinds of cells and they perform different types of functions. Each tissue has a specific function to perform and different types of tissues of a plant body function in co-ordination with one another.

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