Introduction to Angiosperm
Angiosperm are well developed and highly evolved group of plants in which there is seeds enclosed within the fruit. This note contains detail information of angiosperm along with its characters.
Summary
Angiosperm are well developed and highly evolved group of plants in which there is seeds enclosed within the fruit. This note contains detail information of angiosperm along with its characters.
Things to Remember
- Angiosperm are well developed and highly evolved group of plants in which there is seeds enclosed within the fruit.
- They have well differentiated root, stem and leaves and also have well developed vascular tissue.
- Angiosperm are autotrophic in nature, but there are some angiosperms which show heterotrophic nature with either parasitic or saprophytic mode of nutrition.Eg; Parasitic; Cuscuta, Saprophytic; Neottia.
- Angiosperm shows a distinct alternation of generation with dominating saprophytic phase.
- Those plants which flower many times in a lifetime is polycarpic and those which flowers once in a lifetime is monocarpic.
MCQs
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Subjective Questions
Q1:
Define climate change.
Type: Very_short Difficulty: Easy
Q2:
Mention the causes of climate change and global warming.
Type: Short Difficulty: Easy
<ul>
<li>Green house gases and their sources.</li>
<li>Volcanic eruption.</li>
<li>Increase of carbon dioxide emission.</li>
<li>Depletion of ozone layer in the atmosphere.</li>
<li>Rapid population growth.</li>
<li>Rising of sea level.</li>
</ul>
Q3:
What are green house effects?
Type: Very_short Difficulty: Easy
Q4:
How can climate change be controlled? Mention some of its controlling measures.
Type: Short Difficulty: Easy
<ul>
<li>Reduction of consumption of fossils fuels such as petroleum and coal.</li>
<li>Increasing forests or afforestation in the country.</li>
<li>Conducting public awareness programs.</li>
<li>Use of bio-gas plants.</li>
</ul>
Q5:
Mention some of the adverse effects of climate change.
Type: Short Difficulty: Easy
<ul>
<li>Rising of sea-level which can drown coastal areas.</li>
<li>Imbalance in natural biodiversity</li>
<li>Change in weather pattern and climatic temperature of the world.</li>
</ul>
<p> </p>
<p> </p>
<p> </p>
Q6:
What do you mean by global warming?
Type: Short Difficulty: Easy
Q7:
What suffer the adverse effects of climate change?
Type: Short Difficulty: Easy
Q8:
Write any two controlling measures of climate changes.
Type: Short Difficulty: Easy
<p>Reduction of greenhouse gases likes carbon dioxide and methane.</p>
<p>Afforestation and control over deforestation.</p>
Q9:
What do you mean by biodiversity?
Type: Short Difficulty: Easy
Q10:
Write any two measurable effects of climate change.
Type: Short Difficulty: Easy
<ul>
<li>Icecaps has started to melt.</li>
<li>Sea-level is rising which can drown coastal areas.</li>
</ul>
Q11:
Define climate.
Type: Very_short Difficulty: Easy
Q12:
Write down some of effects of climate change?
Type: Very_short Difficulty: Easy
<ul>
<li>Icecaps has started to melt.</li>
<li>There are frequent storms and irregular rainfalls.</li>
<li>Natural balance is damaged destroying biodiversity.</li>
</ul>
Videos
Causes and Consequences of Climate Change
Greenhouse effect, the carbon cycle and climate change
Climate change causes
What is climate change? - Met Office climate change guide
Climate Change Impacts - Global Warming - The Trend Is Blue
Introduction to Angiosperm
Angios: Enclosed
Sperma: Seeds
Angiosperm is well developed and highly evolved group of plants in which there are seeds enclosed within the fruit. They have well-differentiated root, stem, and leaves and also have well developed vascular tissue.
General characters of Angiosperm
- Smallest Angiosperm: Wolffia (0.1 mm)
- Tallest Angiosperm: Eucalyptus regnans (130.5m-435 ft)
- Largest: Ficus benghalennsis
- Angiosperm is autotrophic in nature, but there are some angiosperms which show heterotrophic nature with either parasitic or saprophytic mode of nutrition. Eg; Parasitic; Cuscuta, Saprophytic, Neottia.
- Angiosperm shows a distinct alternation of a generation with dominating saprophytic phase.
source:biologicalexceptions.blogspot.com
fig: Wolffia,Parasitic,Neotia
Angiosperms show three different forms and habit i.e herb, shrub, and tree.
- Herbs are the small sized plant with soft, weak and pliable stems having less or no branches. Eg; Mustard, Bamboo etc
- Shrubs are medium sized woody bushy plants having branches arising near the base. Eg; Rose, Marigold etc
- Trees are large sized hardly woody plants with distinct trunk having branches arising near the apex.
On the basis of lifespan, angiosperms are of three types:
- Annual: They complete their life within few weeks to one year.
- Biennal: They complete their life within 2 years.
- Perennial: They can survive for more than two years. It is of two types. Those plants which flower many times in a lifetime is polycarpic and those which flowers once in a lifetime is monocarpic.
On the basis of water requirements, angiosperms are of three types:
- Hydrophytes: Hydron means water and phyton mean plants. So, literally, we can say the plant that hydrophytes are the plants that grow the well insufficient supply of water. Eg: Lotus
- Mesophytes: Meson means moderate and phyton means plants. So, plants that grow well in a moderate or normal supply of water is called mesophyte. Eg: Maize
- Xerophytes: Xerox means dry or arid. So, those plants which grow well in dry or arid habitat is Xerophytes. Eg: Cactus
source:www.shutterstock.com
fig:lotus,Maize,Cactus
Lesson
Angiosperm
Subject
Biology
Grade
Grade 11
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