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Introduction

Around 500 million years ago, small plants began to appear on land and provided ecological niches (habitats) for other lifeforms to survive on land. The first land plants did not produce seeds and spread only by spores. The most primitive did not even have vascular tissue (cells joined into tubes to transport water and nutrients throughout the plant body).

This practical is concerned with the seedless plants, many of which still common today. You will look at the basic types, how they follow alternation of generations and the significance they have for life on Earth. The relevant information is in eText Biology is in Chapter 29, though you may use other sources.



PART 1: TYPES OF SEEDLESS PLANT (20 MARKS)

Identify the following seedless plant specimens using a reference source such as your eText Biology. Complete the table below the pictures.


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Specimen 1                          





2.jpg

Specimen 2


3.jpg

Specimen 3


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Specimen 4


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Specimen 5



Complete the following table (20 marks). The example of the fern has been included.  Note: you can only get 2 marks for Vascular or Nonvascular if the corresponding Type of Plant is correct.

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Image transcriptions

Complete the following table (20 marks). The example of the fern has been included. Note: you can only get 2 marks for Vascular or Nonvascular if the corresponding Type of Plant is correct. Specimen Type of plant Vascular or number Nonvascular 1 3 marks 2 marks 2 3 marks 2 marks 3 3 marks 2 marks 4 3 marks 2 marks 5 Fern Vascular PART 2: ALTERNATION OF GENERATIONS (20 MARKS) Alternation of generations (below) is found in all the plants.

PART 2: ALTERNATION OF GENERATIONS (20 MARKS) Alternation of generations (below) is found in all the plants. 3. Mitosis sporangium (2n) zygote (2n) diploid (2n] 1. haploid (n) 2. sporo (n) gametes (n) Mitosis Mitosis 4. Figure 24.3 Alternation of generations.

Which process is represented by 1? (2 marks) Which process is represented by 2? (2 marks) Which plant generation is represented by 3? (2 marks) Which plant generation is represented by 4? (2 marks) In a few sentences, explain the lifecycle of the fern in such a way that you clearly demonstrate that is exhibits alternation of generations. (12 marks) PART 3: THE SIGNIFICANCE OF SEEDLESS PLANTS (20 MARKS) Both the seedless nonvascular and seedless vascular plants have economic and ecological importance to man. Using eText Biology (or hardcopy), summarize relevant information in the following table in this regard. An example of an important issue is included to help you get started. Seedless nonvascular plants (mosses) | Seedless vascular plants They can enrich soils with nutrients, such as nitrogen.

ecological importance to man. Using eText Biology (or hardcopy), summarize relevant information in the following table in this regard. An example of an important issue is included to help you get started. Seedless nonvascular plants (mosses) | Seedless vascular plants They can enrich soils with nutrients, such as nitrogen. TOTAL MARKS OUT OF 60 = PERCENTAGE (GRADE /100) = END

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Subject: Biology, Science
Introduction Around 500 million years ago, small plants began to appear on land and provided ecological niches (habitats) for other lifeforms to...
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