Question

E. Answer the following questions in brief.
What is nutrition?
2 Differentiate between autotrophs and heterotrophs.
they
What are the raw materials required for photosynthesis, and from where are
obtained?
4. Why should we destarch a leaf before conducting an experiment to show that light
is necessary for photosynthesis?
5. How are partial parasitic plants different from other parasitic plants?
What are saprophytes? Give an example.
7. Cuscuta plants cannot perform photosynthesis. How do they obtain their nutrition?
8. Deep in the ocean, sunlight can hardly reach, yet plants such as brown and red
alzae are found here. How do you think they are able to synthesise their food?
% Can plants use an artificial source of light (for example, tube light) for preparing
?​

Answer 1

Answer:

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Explanation:

1. Nutrition is the process by which an organism uses food to support its life. It includes ingestion, absorption, assimilation, biosynthesis, catabolism and excretion.
2. Autotrophs are organisms that prepare their own food through the process of photosynthesis, whereas heterotrophs are organisms that cannot prepare their own food and depend upon autotrophs for nutrition.
3. The raw materials for photosynthesis are carbon dioxide and water. The green plants take carbon dioxide from air for photosynthesis. ... The water required by the plants for photosynthesis is absorbed by the roots of the plants from the soil through the process of osmosis.
4. We should destarch a leaf before conducting any experipent to show that light is necessary for photosynthesis, because, if there is starch in the leaves of a plant, there is no need for photosynthesis. Thus, after destarching, with the help of light, we can again conduct photosynthesis and get starch.
5. Partial parasites are those which are partially dependent on their hosts. Partial parasitic plants are usually chlorophyllous therefore they are dependent on their hosts for water and nutrients only. ... Total parasitic plants are usually achlorophyllous. Cuscuta reflexa, Orobanche aegyptiaca, Striga asiatica etc
6. Organisms who live and feed on dead organic materials and obtain nutrition for their growth are known as saprophytes. Example – Mucor, yeast. Saprophytes are mostly fungus and/or bacteria.
7. Cuscuta is a parasitic plant. It has no chlorophyll and cannot make its own food by photosynthesis. Instead, it grows on other plants, using their nutrients for its growth and weakening the host plant
8. deep in the ocean light can hardly reach, yet there are plants like brown and red algae found here. ... They receive oxygen from water and at this depth algae can access sunlight. All algae contain chlorophyll. The pigments of red and brown algae mask the predominant green photosynthetic pigments.
9. No, plant does not use any artificial source of light for preparing food they use sun's source of light for preparing food.

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