Nutrition in Plants Class 7 | worksheet & Printable

Nutrition in Plants Class 7 | worksheet & Printable
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Nutrition in Plants Class 7 | worksheet & Printable

Nutrition in plants for class 7. Download nutrition in plants for class 7 worksheet based on the latest CBSE syllabus including MCQ type questions, fill in the blanks, define, long questions, and more on nutrition in plants for class 7 students. 

Nutrition in Plants (Points to remember)

Chlorophyll: Chlorophyll is a green coloured pigment present in the leaves that traps solar (sun) energy

Insectivorous plants: Plants that feed on insects

Nutrition: Nutrition is the process of intake of food and its utilisation by the body of an organism.

Parasite: Are organisms that live and feeds on other living organisms. Examples of parasite plants are Cuscuta and Rafflesia.

PhotosynthesisThe process by which green plants make their own food with the help of carbon dioxide, water, and minerals in the presence of sunlight.

Saprophytes: An organisms that feed on dead and decaying organic matter, examples of saprophytes are Monotropa, Mushrooms and bread moulds.

Armillaria melllea: Is a kind of mushroom, is bioluminescent as it can emit light.

Stomata: Tiny openings on the lower surface of the leaf that allow the exchange of gases.

The mode of nutrition in which organisms make food themselves from simple substances is called autotrophic (auto = self; trophos = nourishment) nutrition. Therefore, plants are called autotrophs. Animals and most other organisms take in food prepared by plants. They are called heterotrophs (heteros = other).

Leaves are the food factories of plants. Therefore, all the raw materials must reach the leaf. Water and minerals present in the soil are absorbed by the roots and transported to the leaves. Carbon dioxide from air is taken in through the tiny pores present on the surface of leaves. These pores are surrounded by ‘guard cells’. Such pores are called stomata.

Water and minerals are transported to the leaves by the vessels which run like pipes throughout the root, the stem, the branches and the leaves. They form a continuous path or passage for the nutrients to reach the leaf. They are called vessels The leaves have a green pigment called chlorophyll. It helps leaves to capture the energy of the sunlight. This energy is used to synthesise (prepare) food from carbon dioxide and water. Since the synthesis of food occurs in the presence of sunlight, it is called photosynthesis (Photo: light; synthesis : to combine). So we find that chlorophyll, sunlight, carbon dioxide and water are necessary to carry out the process of photosynthesis. The solar energy is captured by the leaves and stored in the plant in the form of food. Thus, sun is the ultimate source of energy for all living organisms. In the absence of photosynthesis there would not be any food. The survival of almost all living organisms directly or indirectly depends upon the food made by the plants. Besides, oxygen which is essential for the survival.

There are some plants which do not have chlorophyll. They cannot synthesise food. Like humans and animals, such plants depend on the food produced by other plants. They use the heterotrophic mode of nutrition. Cuscuta (Amarbel). It does not have chlorophyll. It takes readymade food from the plant on which it is climbing. The plant on which it climbs is called the host.Cuscuta is called the parasite.

Fungi absorb the nutrients from the bread. This mode of nutrition in which organisms take in nutrients from dead and decaying matter is called saprotrophic nutrition. Such organisms with saprotrophic mode of nutrition are called saprotrophs.

Some organisms live together and share both shelter and nutrients. This relationship is called symbiosis. For example, certain fungi live inside the roots of plants. The plants provide nutrients to the fungus and, in return, the fungus provides water and certain nutrients. In organisms called lichens, a chlorophyll-containing partner, which is an alga, and a fungus live together. The fungus provides shelter, water and minerals to the alga and, in return, the alga prepares and provides food to the fungus.

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