12 Questions
Division I - Thallophyta plants mainly grow in ______
water
Algae do not have specific parts like root, stem, leaves, and flowers but are autotrophic due to the presence of ______
chlorophyll
Examples of algae include Spirogyra, Ulothrix, Ulva, Sargassum, etc. Some are found in fresh water while some are found in ______ water
saline
Plants of the Thallophyta division usually have a soft and ______-like body
fibre
Division II - Bryophyta plants are called the 'amphibians' of the plant kingdom because they grow in moist soil but need ______ for reproduction
water
Bryophytes reproduce by ______ formation
spore
Put a cover-slip over the slide and observe under a compound microscope. Do you see the spirally arranged green thread-like chloroplasts in the cells in that straight fibre? This plant is known as ______. Observe Observe and discuss.
Spirogyra
What is the similarity between the plants of the groups Thallophyta, Bryophyta and Pteridophyta irrespective of differences in their body structure? They are all called ______.
cryptogams
Plants from the Pteridophyta division have well-developed roots, stem, and leaves and separate tissues for conduction of food and water. They reproduce with the help of ______ formed along the back or posterior surface of their leaves.
spores
Examples of plants that reproduce asexually by spore-formation and sexually by zygote formation include ferns like Nephrolepis, Marsilea, Pteris, Adiantum, Equisetum, ______, ______, etc.
Lycopodium
All plants of the Bryophyta division reproduce by ______ formation.
spore
Plants of the Bryophyta division have ______, ______, and stalk as their main parts.
leaf-like parts
Study Notes
Observing Spirogyra
- Spirogyra is a plant with spirally arranged green thread-like chloroplasts in its cells.
- It can be observed under a compound microscope.
Plants of the Pteridophyta Division
- They have well-developed roots, stem, and leaves, and separate tissues for conduction of food and water.
- They do not bear flowers and fruits.
- They reproduce with the help of spores formed along the back or posterior surface of their leaves.
- Examples include ferns like Nephrolepis, Marsilea, Pteris, Adiantum, Equisetum, Selaginella, and Lycopodium.
- They reproduce asexually by spore-formation and sexually by zygote formation.
- They have a well-developed conducting system.
Plants of the Bryophyta Division
- They reproduce by spore formation.
- They are called cryptogams as their reproductive organs cannot be seen.
- They grow in moist soil but need water for reproduction.
- They are thalloid, multicellular, and autotrophic.
- The structure of the plant body is flat, ribbon-like, and long, without true roots, stem, and leaves.
- Instead, they have stem-like or leaf-like parts and root-like rhizoids.
- They do not have specific tissues for conduction of food and water.
- Examples include Moss (Funaria), Marchantia, Anthoceros, and Riccia.
Plants of the Thallophyta Division
- They grow mainly in water.
- They do not have specific parts like root-stem-leaves-flowers but are autotrophic due to the presence of chlorophyll.
- They are called algae.
- They show great diversity, and may be unicellular or multicellular, and microscopic or large.
- Examples of algae include Spirogyra, Ulothrix, Ulva, Sargassum, etc.
- They usually have a soft and fibre-like body.
- Various types of fungi like yeasts and moulds which do not have chlorophyll are also included in this group.
Test your knowledge on Thallophyta, a group of plants that mainly grow in water and do not have specific parts like root, stem, leaves, and flowers. Learn about algae, including examples like Spirogyra, Ulothrix, Ulva, and Sargassum.
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