10 Questions
Which organisms are classified as heterotrophs?
Animals
What is the primary mode of nutrition for green plants?
Autotrophic
Which plants take food from host plants?
Cuscuta (parasitic plants)
What are the essential requirements for photosynthesis in plants?
Chlorophyll, water, carbon dioxide, sunlight
Which type of plants produce simple chemical substances like carbohydrates through photosynthesis?
Green plants
In what way do insectivorous plants obtain their nutrition?
By trapping insects
Which of the following is a characteristic of all animals?
'Other animals as food' dependency
'Solar energy is absorbed by the chlorophylls present in leaves/plants.' What process does this statement describe?
Photosynthesis
'Plants like Cuscuta are parasites.' Based on this information, what is the nutrition mode of Cuscuta?
Parasitic
'They can reduce the use of nitrogenous fertiliser where leguminous plants are grown.' Why can farmers reduce the use of nitrogenous fertilizers for leguminous plants?
Leguminous plants fix atmospheric nitrogen
Study Notes
Modes of Nutrition
- Plants like Cuscuta (Amarbel) use heterotrophic mode of nutrition, relying on readymade food from other plants (hosts) as they lack chlorophyll.
- Insectivorous plants, like the pitcher plant, obtain nutrients by digesting insects that enter their structures.
- Saprotrophic nutrition involves absorbing nutrients from dead and decaying matter, exhibited by organisms like fungi.
Fungi
- Fungi can grow on various substrates, including pickles, leather, clothes, and other articles, especially in hot and humid weather.
- Fungal spores are present in the air and can germinate on wet and warm surfaces.
- Fungi can cause diseases in plants, animals, and humans, but some species, like yeast and mushrooms, are useful.
- Some fungi are used as medicines.
Symbiotic Relationships
- Symbiosis involves organisms living together and sharing shelter and nutrients.
- An example of symbiosis is certain fungi living inside the roots of plants, providing mutual benefits.
Explore the concept of plant nutrition and the unique case of Cuscuta (Amarbel) which relies on a host plant for its nutrition. Identify the characteristics and behavior of Cuscuta and understand its mode of obtaining food.
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