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

NCERT Solutions Class 7 Science Chapter 1 Nutrition in Plants provided below to help 7th standard students understand the concepts more effectively. The NCERT Solutions for Class 7 Science Chapter 1 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.

The NCERT Solutions provided here help you in understanding the topic thoroughly. The solutions are prepared by our panel of experts to assist you in understanding the plant nutrition topic deeply. These solved solutions help you to score good marks and also help you in remembering the topic for a longer period.

Download PDF of NCERT Solutions for Class 7 Science Chapter 1 – Nutrition in Plants

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 sunlight. Perform the iodine test with the leaves of both the 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 plant 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 as photosynthesis to prepare their food. The process is as follows

• Water is taken from the roots of the plant, and it is transported to leaves of the plant.
• Carbon dioxide from air enter 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 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:

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 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.
• 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 – 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 you 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, stomata. Various other modes of nutrition in plants like insectivorous plants. This Chapter will teach about the basic of plants nutrients, 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 to note so that students can go through the notes while revising the Chapter for the exams.

Apart from this, 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 air and they need nitrogen in a soluble form. The bacterium called Rhizobium can take atmospheric nitrogen and can convert it to usable form.

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