NCERT Solutions For Class 7 Science Chapter 1: Nutrition In Plants

NCERT Solutions Class 7 Science Chapter 1 – Free PDF Download

NCERT Solutions for Class 7 Science Chapter 1 Nutrition in Plants is provided below to help Class 7 students understand the concepts more effectively. The NCERT Solutions for Class 7 Science are prepared by expert teachers according to the latest syllabus of CBSE Class 7 Science. Students should practise regularly to excel in their Class 7 examinations. Practising these NCERT Solutions is the ultimate need for students who aspire to score good marks in the upcoming Science board examination.

Download Exclusively Curated Chapter Notes for Class 7 Science Chapter – 1 Nutrition In Plants

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Download Most Important Questions for Class 7 Science Chapter – 1 Nutrition In Plants

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The NCERT Solutions for Class 7 Science provided here help you understand the important topics thoroughly. The solutions are prepared by our panel of experts to assist you in understanding the plant nutrition topic in-depth. These solved NCERT Solutions for Class 7 will help students score good marks and also help them remember the topic for a longer period.

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Access answers of NCERT Solutions for Class 7 Science Chapter 1 – Nutrition in Plants

Exercise Questions

1. Why do organisms take food?

Solution:

All organisms require energy for their life processes. Plants prepare their food and acquire nutrients from abiotic components like soil, air, water and sunlight. On the other hand, animals need to get food from either plants or other animals to obtain nutrients; hence, animals need to take food to acquire nutrients and energy.

2. Distinguish between a parasite and a saprophyte.

Solution:

3. How would you test the presence of starch in leaves?

Solution:

Take two potted plants of the same kind. Keep one in the dark for 72 hours and the other in the sunlight. Perform the iodine test with the leaves of both plants as given below. Now, leave the pot, which was earlier kept in the dark, undisturbed for 3–4 days and perform the iodine test again on its leaves.

Iodine test:

Put iodine solution on the leaf.

Observation:

Blue-black colour will be observed on the leaves of the plant kept in sunlight, which indicates the presence of starch.

Blue-black colour will not be observed on the leaves of plants kept in the darkroom. This indicates the absence of starch.

4. Give a brief description of the process of synthesis of food in green plants.

Solution:

Green plants use a process called photosynthesis to prepare their food. The process is as follows

• Water is taken from the roots of the plant, and it is transported to the leaves of the plant.
• Carbon dioxide from the air enters the leaves through pores called stomata. This diffuses the cell containing chlorophyll.
• Water molecule is broken down into Hydrogen and Oxygen with the help of sunlight.
• Hydrogen combines with Oxygen and Hydrogen to form carbohydrates.
• Photosynthesis is represented by the following equation.

5. Show with the help of a sketch that plants are the ultimate source of food.

Solution:

6. Fill in the blanks.

(a) Green plants are called _________________ since they synthesise their own food.

(b) The food synthesised 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.

Solution:

(a) Green plants are called autotrophs since they synthesise their food.

(b) The food synthesised by plants is stored as starch.

(c) In photosynthesis, solar energy is absorbed by the pigment called chlorophyll.

(d) During photosynthesis, plants take in carbon dioxide and release oxygen gas.

7. Name the following.

i) A parasitic plant with a yellow, slender and branched stem.

ii) A plant that is partially autotrophic.

iii) The pores through which leaves exchange gases.

Solution:

i) Cuscuta

ii) Pitcher plant

iii) Stomata

8. Tick the correct answer.

(a) Cuscuta is an example of:

(i) autotroph

(ii) parasite

(iii) saprotroph
(iv) host

(b) The plant which traps and feeds on insects is:

(i) Cuscuta

(ii) China rose

(iii) pitcher plant

(iv) rose

Solution:

(a) (ii) Parasite

(b) (iii) pitcher plant

9. Match the items given in Column I with those in Column II.

Solution:

10. 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 synthesise 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)

Solution:

1. False
2. False
3. True
4. True

11. 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

Solution:

The answer is (ii) Stomata

12. 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

Solution:

The answer is (iv) leaves

13. Why do farmers grow many fruits and vegetable crops inside large greenhouses? What are the advantages to the farmers?

Solution:

Fruits and vegetable crops are grown in large greenhouses because it protects crops from external climatic conditions and provides 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.
• It protects crops from wind and rodents

Important topics covered in NCERT Solutions for Class 7 Science Chapter 1 – Nutrition in Plants

1. Mode of Nutrition in Plants
2. Photosynthesis – the food-making process in Plants
3. The alternative mode of nutrition in Plants
4. Saprophytes
5. Nutrient replenishment in the soil

NCERT Class 7 Science Chapter 1 is colourful as it introduces you to the world of plants around you. The curriculum has a variety of projects that will make students enjoy the learning process. The curriculum introduces you to new terminology and concepts, which will make students look forward to studying this Chapter.

In Class 7 Nutrition in Plants Chapter, students will be introduced to many new concepts related to plants and how they get nutrition for themselves; they will also get to know about photosynthesis-process of preparation of food in plants, chlorophyll, and stomata. Various other modes of nutrition in plants, like insectivorous plants. This chapter will teach about the basics of plant nutrients and how plants make their food, but reading this chapter carefully will further help the students to understand the concepts of botany in higher standards. Therefore, it is highly recommended to prepare notes so that students can go through the notes while revising the Chapter for the exams. Students can utilise the NCERT Solutions for Class 7 Science Chapter 1 for any quick references to comprehend complex topics.

Apart from this, by referring to these NCERT Solutions, students will also get to know about how nutrients are replenished in the soil, as we all know that nitrogen content is very much high in the air, but plants cannot take nitrogen through the air, and they need nitrogen in a soluble form. The bacterium called Rhizobium can take atmospheric nitrogen and can convert it to a usable form.

Students are also advised to solve the previous years’ questions as well as the sample papers. Solving the sample papers and previous years’ papers will also help them to know the exam pattern as well as the marking scheme.