NCERT Solutions for Class 7 Science Chapter 1 - Nutrition In Plants

The first chapter of NCERT Class 7 Science is colourful as it introduces students to the world of plants around them. The curriculum has numerous projects that will make the learning process enjoyable for students. It also introduces new terminology and concepts, which will stimulate students' interest in this Chapter.

Students will learn a lot about plants and how they obtain nutrition for themselves in the Class 7 Nutrition in Plants Chapter. They will also learn about chlorophyll, stomata, and photosynthesis—the process by which plants prepare food. Other plant nutrition strategies, such as those used by insectivorous plants. 

These NCERT Solutions provide a range of practice questions, including multiple-choice questions (MCQs) and short answers, that correspond with the most recent CBSE syllabus for students who want to do well on their exams. Students who use these resources will be able to gain a firm grasp of the chapter and be well-prepared for their Class 7 Science exams. To improve your academic performance and gain a deeper understanding of these concepts, download the NCERT Solutions for Class 7 Science Chapter 1 PDF.

1.0Download Class 7 Science Chapter 1 NCERT Solutions PDF Online

Students can download NCERT Solutions for Class 7 Science Chapter 1 and practice it from anywhere anytime.

2.0NCERT Solutions for Class 7 Science Chapter 1 Overview

The "Nutrition in Plants" chapter will teach students about plants and how they utilize their food. It is well known that while humans and other animals cannot produce their own food, plants can. The main essential components of nutrients or food are carbohydrates, proteins, fats, minerals, and vitamins; these are the only nutrients for plants. For plants to produce nutrients, they require the presence of carbon dioxide, water, and minerals. Nutrition is the process through which plants use their food to produce energy. Understanding the processes that take place in plants to produce oxygen—a vital component for the survival of all living things—is important. This chapter explains these processes.

Although this chapter covers the fundamentals of plant nutrition and how plants make food, students will benefit from reading it closely, as it will help them comprehend higher-level botany concepts. It is, therefore, strongly recommended that students make notes so they can revisit all the important concepts in this chapter for the exams while going over the notes.

3.0Important Topics of Class 7 Science Chapter 1 Nutrition In Plants 

• Mode of Nutrition in Plants
• Photosynthesis – the food-making process in Plants
• The alternative mode of nutrition in Plants
• Saprophytes
• Nutrient replenishment in the soil

4.0NCERT Questions with Solutions for Class 7 Science Chapter 1 - Detailed Solutions

• Why do organisms take food? Ans. All living organisms require food to survive. It gives them energy to perform various activities. All activities such as playing, running, walking, studying, etc. require energy. The nutrients present in our food provide energy to our body. These are also important for growth and development of the body.
• How would you test the presence of starch in leaves? Ans. Aim To demonstrate that sunlight is essential for photosynthesis. Method (1) Destarch the plant by placing it in a dark corner for 3 days. (Destarching is done by leaving the plant in a dark place for two or three days leading to consumption of starch by the plant as it would not be able to perform photosynthesis in dark.) (2) Pick any leaf from the destarched plant and test it for starch to confirm whether it is fully starch-free. (3) Cover the leaf partly by black paper or Ganong's light screen. (4) Now place the plant in strong sunlight for at least 6 hours. (5) Pick the leaf covered by the strip of black paper, remove the strip and test the leaf for starch using iodine solution. Observation The covered portion of the leaf does not show blue-black colour. Conclusion There was no starch formation in the covered part, so this part did not turn blue-black. This shows that light is necessary for photosynthesis.
• Give a brief description of the process of synthesis of food in green plants. Ans. Photosynthesis is defined as the process in which the chlorophyll containing plant cells synthesize food in the form of carbohydrates, using carbon dioxide and water in the presence of solar energy.
  
• Sources of raw materials required for photosynthesis: (a) Water is taken in from the roots of the plant and is transported to the leaves. (b) Carbon dioxide from the air enters the leaves through the tiny pores called stomata and diffuses to the cells containing chlorophyll. (c) Solar energy is used to break water into hydrogen and oxygen. This hydrogen is combined with carbon dioxide to form food for the plants, which is ultimately used by the animals as well. Thus, photosynthesis can be represented by the following equation. ${\mathrm{CO}}_2+$ Water $\underset{\text{ Chlorophyll }}{\overset{\text{ Suligt }}{\to }}$ Glucose + Oxygen
• Show with the help of a sketch that the plants are the ultimate source of food. Ans.

• Fill in the blanks: (a) Green plants are called since they synthesize their own food. (b) The food synthesized by plants is stored as _. (c) In photosynthesis solar energy is absorbed by the pigment called _. (d) During photosynthesis plants take in and release gas. Ans. (a) autotrophs (b) starch (c) chlorophyll (d) carbon dioxide, oxygen
• Name the following - (i) A parasitic plant with yellow, slender, and branched stem. (ii) A plant that is partially autotrophic. (iii) The pores through which leaves exchange gases. Ans. (i) Cuscuta (ii) Pitcher plant (iii) Stomata
• Tick the correct answer: (a) Cuscuta is an example of - (i) Autotroph (ii) Parasite (iii) Saprotroph (iv) Host Ans. (ii) Parasite (b) The plant which traps and feeds on insects is - (i) Cuscuta (ii) China rose (iii) Pitcher plant (iv) Rose Ans. (iii) Pitcher plant
• Match the items given in Column - I with those in Column - II.

Ans.

• Mark ' T ' if the statement is true and ' F ' if it is false: (i) Carbon dioxide is released during photosynthesis. (T/F) (ii) Plants which synthesize their food are called saprotrophs. (T/F) (iii) The product of photosynthesis is not a protein. (T/F) (iv) Solar energy is converted into chemical energy during photosynthesis. (T/F) Ans. (i) False (ii) False (iii) True (iv) True
• Choose the correct option from the following: Which part of the plant takes in carbon dioxide from the air for photosynthesis? (i) Root hair (ii) Stomata (iii) Leaf veins (iv) Petals Ans. (ii) Stomata
• Choose the correct option from the following - Plants take carbon dioxide from the atmosphere mainly through their - (i) roots (ii) stem (iii) flowers (iv) leaves Ans. (iv) leaves
• Why do farmers grow many fruits and vegetable crops inside large green houses? What are the advantages to the farmers? Ans. Fruits and vegetable crops are grown in large greenhouses because it protects crops from external climatic condition and to provide suitable temperature for the growth of crops. Advantages to farmers while growing fruits and vegetable crops inside greenhouses are It protects crops from diseases and adverse climatic conditions.