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CBSE Class 7 Science Nutrition in Plants Worksheets

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Vedantu’s Class 7 Science Nutrition in Plants Worksheets with Answers CBSE

CBSE Class 7 Science Nutrition in Plants Worksheets with Answers for Chapter 1 in PDF format to download prepared by expert Science teachers from the latest edition of CBSE(NCERT) books. Vedantu is a platform that provides free CBSE Solutions (NCERT) and other study materials for students. Maths Students who are looking for better solutions can download Class 7 Maths NCERT Solutions to help you to revise the complete syllabus and score more marks in your examinations. Register Online for NCERT Solutions Class 7 Science tuition on Vedantu.com to score more marks in the CBSE board examination. 

A nutritionist translates the word nutrition as "feeding or nourishing.". As such, nutrition is the process by which individuals use food to maintain their physical and mental health. Included in this process are ingestion, absorption, assimilation, biosynthesis, catabolism, and excretion.

An essential part of plant nutrition is the process of supplying chemical elements and compounds necessary for growth, metabolism, and external supply to the plant. A plant may not engage in a normal life cycle without the element, or it may be an essential component or metabolite of the plant

Students will read about the fields and concepts related to Nutrition in plants, how plants grow, their internal metabolism, and other important roles of plant nutrition. Nutrition in plants starts with the introduction, nutrition mode, and nutrient replenishment.

Sections of Nutrition in Plants include:

  1. Introduction

  2. Photosynthesis

  3. Other modes of nutrition in plants

  4. How nutrients are replenished in the soil

CBSE Class 7 Science Nutrition in Plants Worksheets with Answers - Chapter 1

Introduction

Plants and animals, for example, are all dependent on food. All living creatures require food to survive. We will deal with the nutritional needs of plants in this chapter. A nutrient is composed of carbohydrates, proteins, fats, vitamins, and minerals. Its major components are carbohydrates, protein, fat, vitamins, and minerals.


Mode of nutrition in plants

  • Plants make their food by the use of different materials that are raw for example water, carbon dioxide and minerals.

  • There are two modes of nutrition-

  1. Autotrophic

  2. Heterotrophic

1. Autotrophs or Autotrophic: - Plants that have chlorophyll trap the energy from the sun and prepare their own food. The nutrition that is there in the food which gets prepared by the other organisms is called autotrophic nutrition. An autotroph is a life form that has the capability of preparing its own food. Autotrophs are the form of plants that are green in color. Using a process called photosynthesis, they create their own food.

2. Heterotrophs or Heterophobic: - these kinds of substances are those that obtain their food from different organisms. As these kinds of organisms are dependent on other organisms for food, they are called consumers. Every animal and different non-green plants for example is fungi that come under the category in this form. Organisms that do follow the hetero module of nutrition are called heterotrophs.

  • Those organisms that consume other organisms are heterotrophic organisms, also known as heterophobic organisms. 

The organisms listed above are known as consumers because they consume food from other organisms. Organisms that follow a heterotrophic mode of nutrition are heterotrophs. This classification includes animals and non-green plants like fungi.

  • Photosynthesis

Chemical energy is produced by when light energy is converted by plants and other organisms via photosynthesis. Light energy is captured during photosynthesis, which is used to convert water, carbon dioxide, and minerals into oxygen and energy-rich organic molecules.

  1. Green leaves of plants undergo photosynthesis.

  2. Plant leaves are used to prepare a simple sugar called glucose which is extracted from the leaves of the plant.

  3. Starches are made from the glucose in the plant leaves. Starches are stored in leaves.

  4. Plants make carbohydrate energy from sunlight that causes them to be green.

 

Three Steps of Photosynthesis

There are three steps that are involved in photosynthesis. They are:

  • A chlorophyll molecule that absorbs solar energy.

  • Chemical energy is created by the conversion of light energy into chemical energy, and water is broken down into hydrogen and oxygen by light energy.

  • Chemical energy is utilized to reduce carbon dioxide into carbohydrates such as glucose through the use of hydrogen.

 

The Significance  of Photosynthesis

  • The parts of the plants that are green in color can also perform photosynthesis.

  • Sugar, also known as glucose, is the simplest form of food produced by plants. By converting glucose into a complex carbohydrate called starch, plants produce complex carbohydrates.

  • Simple carbohydrates are used for the synthesis of other components into the food like proteins and fats.

  • Proteins can be categorized as nitrogenous compounds. Proteins are prepared by plants using soil nitrogen. 

  • Water contains minerals that plants use to convert glucose (simple carbohydrates) into carbohydrates, proteins, and fats.

  • Photosynthetic processes are important because they-

  1. Sustain life on Earth and provide food for other organisms, including humans.

  2. Humans, as well as other animals, need oxygen for breathing and respiration.

 

Heterotrophic Nutrition in Plants (Alternative forms of nutrition)

  • The majority of plants produce their own food and contain chlorophyll as a pigment.

  • They are known as heterotrophic plants because they lack chlorophyll and cannot create their own food.

  • There are four types of heterotrophic nutrition.

    1. A parasitic form of nutrition.

    2. An insectivorous mode of nutrition.

    3. Saprophyte mode of nutrition.

    4. The symbiotic mode of nutrition.

 

Nutrient Replenishment in Soil

  • The soil provides nutrients to plants as they synthesize food. This results in an overall reduction of nutrients in the soil.

  • In soils, nutrients are replenished by adding manures and fertilizers.

  • Fertilizers and manures do contain various plant nutrients and a decent amount of minerals like nitrogen, phosphorus and potassium.

  • A Different method for the replenishment of soil is to grow leguminous crops (for example grams, peas, pulses etc.) within the soil.

FAQs on CBSE Class 7 Science Nutrition in Plants Worksheets

1. According to CBSE class 7 chapter 1 of Science, where do the plants obtain nitrogen?

Several bacteria in the soil convert gaseous nitrogen into a usable form and make it available to the plant. As the nitrogen is absorbed by the plants, it is converted into soluble forms. The fertilizers added by farmers also provide nitrogen to plants. 

2. What are the differences between autotrophic and heterotrophic modes of nutrition with reference to concepts taught in class 7 Chapter 1 Science?

Autotrophic:

  • The type of nutrition is found in many green plants.

  • Autotrophic organisms can prepare their own food.

  • In this type of nutrition, carbon dioxide is used for food preparation in the presence of sunlight.

Heterotrophic:

  • The type of this nutrition is there within a few plants and every animal.

  • Heterotrophic organisms cannot prepare their own food.

  • Plants can never make use of carbon dioxide for the preparation of food in sunlight. 

3. Following the concepts discussed in chapter 1 of Class 7 CBSE Science, what is saprotrophic nutrition? Define the term saprotrophs?

The organisms that secrete digestive juices on the dead and decaying matter, convert it into a solution. Then the nutrients are absorbed from it by them. This mode of nutrition is called saprotrophic nutrition. Plants that use a saprotrophic mode of nutrition are called saprotrophs. 

4. Describe the function of stomata as described in the CBSE Science Chapter 1 of class 7.

Stomata (singular: stoma) is the process in which the leaves take in carbon dioxide from the air through the small openings present on the surface of the leaf. A particular stoma is bound by two crescent-shaped guard cells. Water is drawn by these cells from the neighboring cells and swell up allowing the stomata to open. Thus, carbon dioxide can enter the cells of the leaf through the stomata. Students can access free chapter-wise solutions and online learning materials free of cost. 

5. With reference to what has been discussed in Chapter 1 of Class 7 Science, answer:
  1. Why are most of the things spoiled by fungi during the rainy season only?

  2. If the plant is kept in the dark, photosynthesis will not take place. Then in what time will the plant take to make use of all the starch present in them?

The answers are as follows:

  1. Spores of fungi germinate and grow gradually when they get wet and in warm weather conditions. Rainy season gives them a hostile kind of condition, so they can grow and destroy many things in the rainy season only.

  2. Without sunlight, the plant will not be able to prepare its food and so will use the starch already stored in the leaves of plants during respiration in about three days' time.