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Q35 - Identifying Unknown Plants from Vascular Tissue Traits

Theoretical 2 Real exam question - full text reproduced under IBO's CC BY-NC-SA 4.0 license
Xylem, Phloem & Vascular Tissue

In a scientific excursion the students found four plant specimens that they had never seen before. They studied the plant organs carefully and made a few sections from them to look for the plants transport systems. The following table was completed based on their observation. Plant 1: companion cell +, sieve cell -, sieve tube cell +, tracheid +, vessel elements +, pollen + Plant 2: companion cell -, sieve cell +, sieve tube cell -, tracheid +, vessel elements -, pollen + Plant 3: companion cell +, sieve cell -, sieve tube cell +, tracheid +, vessel elements +, pollen - Plant 4: companion cell -, sieve cell +, sieve tube cell -, tracheid +, vessel elements -, pollen -

Using the information and data, determine which of the statements are true or which are false.

A. Plant 1 has seeds with more than two cotyledons.
B. Plant 2 has winged pollen grain and double fertilization.
C. Plants 3 and 1 have smaller female gametophyte as compared to plants 2 and 4.
D. Plant 3 does not belong to the flowering plants, because it does not have pollen grain.
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Question reproduced from IBO 2018, Theoretical Paper 2, licensed under CC BY-NC-SA 4.0 - attributed to the International Biology Olympiad. Open the full exam PDF · Community solutions (unofficial)