Class 7 Science Chapter 1 Nutrition in Plants
NCERT Solutions for Class 7 Science Chapter 1 Nutrition in Plants are given below to help class 7 students to understand the concepts more effectively. NCERT Solutions for Class 7 Science Chapter 1 has been prepared by expert teachers as per the latest syllabus of CBSE Class 7 Science. Students must practice regularly to excel in their class 7 exams. NCERT Solutions for Class 7 Science Chapter 1 Nutrition in Plants.
Class 7 Science Chapter 1, The NCERT solutions provided here help you to understand the topic well. The solutions have been created by our panel of experts to help you understand the subject of plant nutrition in depth. These solved solutions help you to score good marks and also help you to remember the topic for a longer duration.
Class 7 Science Chapter 1 Exercise Questions
Q1. Why do organisms take food?
Answer- All organisms require energy for their life processes. Plants prepare their own food and obtain nutrients from abiotic components such as soil, air, water, and sunlight. On the other hand, animals need to obtain food from plants or other animals to obtain nutrients; So animals need to take food to get nutrients and energy.
Q2. Distinguish between a parasite and a saprophyte.
Answer:
Saprophytes
Acquire nutrients from dead and decaying matter
Example: Fungi
Parasite
Parasites live on or in a host and obtain their food at the expense of their host
Example: roundworm
Q3. How will you test the presence of starch in the leaves?
Answer- Take two potted plants of the same type. Keep one in the dark and the other in the sun for 72 hours. Perform iodine test from the leaves of both the plants as given below. Now leave the vessel which was kept in the dark for 3 – 4 days without stopping and do the iodine test again on its leaves. NCERT Solutions for Class 7 Science Chapter 1 Nutrition in Plants.
Iodine Test:
Apply iodine solution to the leaves
Overview:
A bluish-black colour will appear on the leaves of the plant exposed to sunlight, indicating the presence of starch.
Blue-black colour will not be visible on the leaves of plants kept in the darkroom. This indicates the absence of starch.
Q4. Give a brief description of the process of synthesis of food in green plants.
Answer- 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 carried to the leaves of the plant.
- Carbon dioxide from the air enters the leaves through pores called stomata. It diffuses the cell containing chlorophyll.
- Water molecules break 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.
Class 7 Science Chapter 1 Fill in the blanks :
(a) Green plants are called _________ because they synthesize their own food.
(b) Food synthesized by plants is stored as _________.
(c) In photosynthesis solar energy is absorbed by a pigment called ___________.
(d) During photosynthesis plants take in ___________ and release ___________ gas.
Answer:
(a) Green plants are called autotrophs because they synthesize their own food.
(b) Food synthesized by plants is stored as starch.
(c) In photosynthesis, solar energy is absorbed by a pigment called chlorophyll.
(d) During photosynthesis, plants take in carbon dioxide and release oxygen gas.
Read Also https://ncertbookspdf.in/ncert-solutions-of-class-7-english/
Name the following Class 7 Science Chapter 1:
i) A parasitic plant with yellow, thin, and branched stems.
ii) A plant that is partially autotrophic.
iii) The pores through which the leaves exchange gases.
Answer:
i) Cuscuta
ii) Pitcher plant
iii) Stomata
Tick the correct Answer:
(a) Cuscuta is an example of:
(i) autotrophs
(ii) Parasites
(iii) dead body
(iv) Host
(b) The plant which traps and feeds on insects:
(i) Cuscuta
(ii) China Rose
(iii) Pitcher Plant
(iv) Rose
Answer:
(a) (ii) parasite
(b) (iii) Pitcher Plant
Match the items given in Column I with those in Column II Class 7 Science Chapter 1:
Answer:
Column- I Column-II
Chlorophyll Leaf
Nitrogen Rhizobium
Cuscuta Parasite
Animals Heterotrophs
Insects Pitcher plant
Mark ‘T’ if the statement is true and ‘F’ if it is false Class 7 Science Chapter 1:
(i) Carbon dioxide is released during photosynthesis. (t/f)
(ii) Plants that synthesize their own food are called dead-trophy. (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)
Answer:
false
false
True
True
Choose the correct option from the following:
Which part of the plant takes up carbon dioxide from the air for photosynthesis?
(i) root hairs (ii) stomata (iii) leaf veins (iv) petals
Answer is (ii) Stomata
Choose the correct option from the following:
Plants mainly take up carbon dioxide from the atmosphere:
(i) Roots (ii) Stem (iii) Flowers (iv) Leaves
The answer is (iv) Leaves
Question: Why do farmers grow many fruit and vegetable crops inside large greenhouses? What are the benefits for farmers?
Answer: Fruit and vegetable crops are grown in large greenhouses as it protects the crops from the external climatic conditions and provides suitable temperature for the growth of the crops.
The benefits to farmers by growing fruit and vegetable crops inside greenhouses are
- It protects the crops from diseases and adverse climatic conditions.
- It protects crops from wind and rodents
Class 7 Science Chapter 1 Extra Question Answer
Nutrition in Plants Class 7 Science Very Short Questions Answer.
Question 1. Potato and ginger are both underground parts that store food. Where is food made in these plants? [NCERT Example]
Answer: In both plants, the shoot system and leaves are above the ground. They prepare food through photosynthesis and take it underground for storage.
Question 2. Plants prepare their food using different types of nutrition from us. What is this?
Answer: The mode of nutrition in plants is autotrophic, that is, they synthesize their own food.
Question 3. Photosynthesis requires chlorophyll and some other raw materials. Add the missing raw materials to the list below:
Water, minerals, (a) …… (b) …….
Answer:
(a) sunlight
(b) carbon dioxide
Question 4. The small openings present on the leaf surface. What are they called?
Answer: Stomata are small pores present on the surface of leaves through which gaseous exchange takes place in plants.
Question 5. What is the function of the guard cells of stomata?
Answer: Guard cells help control the opening and closing of stomata for gaseous exchange.
Question 6. Which part of the plant is called the food factory of the plant?
Answer: Leaves are called the food factories of plants. This is because leaves synthesize food by the process of photosynthesis.
Question 7. Carbohydrates are produced by plants as a food source. What molecule is it made of?
Answer: Carbohydrates are made up of carbon, hydrogen, and oxygen.
Question 8. Why do some plants eat insects?
Answer: Insectivorous plants grow in soil that lacks nitrogen, so they eat insects to meet the nitrogen requirement.
Question 9. Define parasite.
Answer: Parasites are organisms that eat other plants or animals, eg. Cuscuta.
Question 10. Name the bacteria which can fix atmospheric nitrogen.
Answer: Rhizobium is a bacterium that can fix atmospheric nitrogen.
Important Class 7 Science Chapter 1 Extra Question Answer
Question 11. Why can’t living organisms other than plants make their own food using CO2, water, and minerals? [HOTS]
Answer: Our body does not have chlorophyll to absorb solar energy which is required to prepare food using wind, water, etc.
Question 12. A leguminous plant can restore the soil concentration of mineral nutrients. Can you give some examples of such plants?
Answer: Plants such as gram, pulses, and beans are leguminous.
Question 13. Algae are green in colour. Why?
Answer: Algae contain chlorophyll which gives them their green colour.
Question 14. What do you think about nutrition?
Answer: The process of using nutrients like carbohydrates, proteins, fats, etc. to produce energy is called nutrition.
Question 15. Fungi can be harmful and useful. Give an example showing these two characteristics of fungi.
Answer: The fungus produces antibiotics like penicillin used to treat diseases and the fungus can also harm us by causing fungal infections on the skin and hair.
Question 16. A unique feature in leaves allows them to prepare food while other parts of the plant cannot. Write the possible reason for this. [hots]
Answer: The leaves contain chlorophyll which is essential for food preparation and is absent in other parts of the plant.
Question 17. Algae and fungi form a unique association, sharing benefits from each other. What is the name of the relationship between them?
Answer: Lichen.
Question 18. Photosynthesis in a plant occurs in any part other than the leaf. Name the plant and the part where photosynthesis takes place.
Answer: The stem and branches of the cactus, the part where photosynthesis takes place, are green in colour.
Question 19. Why is Cuscuta classified as a parasite?
Answer: Cuscuta obtains its nutrition using a union where it deprives its host of all valuable nutrients and absorbs them on its own. That’s why it is called a parasitic plant.
Question 20. The plant cannot directly use the nitrogen present in the soil. Why?
Answer: Plants can utilize nitrogen only in insoluble form whereas nitrogen is present in the soil in inorganic form.
Question 21. Why are insectivorous plants called partial heterotrophs?
Answer: The insectivorous plants are autotrophic, that is, they prepare their own food. They are partly heterotrophic because they eat insects to obtain nitrogen.
Question 22. What food is stored in sunflower seeds?
Answer: Glucose is stored as oil (fat) in sunflower seeds.
Question 23. What do you understand by autotrophic mode of nutrition?
Answer: The mode of nutrition in which organisms take their nutrients from dead and decaying matter is called the endotrophic mode of nutrition.
Question 24. There is a mutually beneficial relationship between the two plants. By what name is it known? give an example.
Answer: Symbiosis is a mutually beneficial relationship between two plants, e.g. moss
Nutrition in Plants Class 7 Science Questions Short Answer
Question 1. Various modes of nutrition have been observed in plants. What are they? Give an example of each.
Answer: Plants show two major modes of nutrition, viz.
(i) Autotrophs are those who can synthesize their own food.
(ii) Heterotrophs are those which depend on other plants and animals for their food. They are of the following types:
(a) Parasites, eg. Amarbel
(b) saprotrophs, e.g. Fungus.
Question 2. Sunlight, chlorophyll, carbon dioxide, water, and minerals are essential raw materials for photosynthesis. Do you know where they are available? Fill in the blanks with suitable raw materials.
(a) Available in the plant: ………
(b) Available in soil: ………
(c) Available in the air: ………
(d) Available during the day: ……… [NCERT Examples]
Answer:
(a) Available in plant : Chlorophyll
(b) Available in soil: water, minerals
(c) Available in the air: Carbon dioxide
(d) Available during the day: Sunlight
Question 3. Plants are considered to be an essential part of the earth as they keep watch on many processes that take place everywhere. What if all the green plants were wiped out from the earth? [HOTS]
Answer: Green plants are the source of energy for all living organisms to perform their normal functions. If all the green plants and trees disappear, all the organisms that depend on them for food and shelter will also die.
The lack of gaseous exchange will lead to an increase in the amount of CO2, which will also lead to the death of humans and other animals. The circle of life will gradually disappear.
Nutrition in Plants Class 7 Science Extra Long Questions Answer
Question 1. Describe the method used by farmers to replenish the soil with minerals and other essential components used by the plants growing in that soil.
Answer: supply of nutrients to the soil crops requires a lot of nitrogen to make proteins. Nitrogen deficiency occurs in the soil after harvesting. Plants cannot directly use the nitrogen gas available in the atmosphere.
The action of certain bacteria can convert this nitrogen into a form easily usable by plants. Rhizobium bacteria live in the root nodules of leguminous plants. These bacteria take nitrogen gas from the atmosphere and convert it into water-soluble nitrogen compounds, making it available to leguminous plants for their growth.
In turn, leguminous plants provide food and shelter to the bacteria as Rhizobium cannot prepare its own food. Thus, they have a symbiotic relationship. This association is very important for farmers, as they do not need to add nitrogen fertilizers to the soil in which leguminous plants are grown.
Question 2.
Harish went to visit his grandfather in the village where he saw that there was an outbreak of fungus in his grandfather’s field but no one knew about it. Harish ran to his grandfather and told him that there was mold in the field. He should use some antifungal agent in his fields to prevent this infection.
(a) What is fungus?
(b) Can fungus only cause disease or be helpful?
(c) What values did Harish depict? [value based question]
Answer:
(a) Fungi are saprophytic organisms that are usually present in the environment as spores that can germinate under optimum conditions on any substrate.
(b) Fungi are also useful in that they produce many antibiotics that can cure different types of infections like penicillin.
(c) Harish is honest, curious, and knowledgeable and has a keen understanding of how to apply it where necessary.
Read Also https://ncertbookspdf.in/ncert-solutions-for-class-7-hindi-chapter-3/
Question 3.
Wild animals like tigers, wolves, lions, and leopards do not eat plants. Does this mean that they can survive without plants? Can you provide a suitable explanation? [hot]
Answer:
Animals like tigers, wolves, lions, and leopards are carnivores and do not eat plants. They hunt and eat herbivorous animals like deer, gaur, bison, zebra, giraffe, etc., which depend on plants for food.
Without plants, herbivores would not survive and eventually, animals such as tigers, wolves, lions, and leopards would have nothing to eat.NCERT Solutions for Class 7 Science Chapter 1 Nutrition in Plants.
Question 4.
Asha had gone to meet her grandfather in his village. He was having serious discussions with his fellow members regarding the productivity level of crops for the current year.
They were all concerned about how to increase the productivity of the crop, Asha listened to this and then suggested to the group that the reason could be a decrease in the level of minerals in the soil.
He asked his grandfather to plant crops like pulses, gram, legumes, etc. for a year, then regular crops. Will this increase crop productivity?
(a) What would you name the process suggested by ASHA? Why is there a decrease in crop productivity?
(b) What are the notable advantages of this process? Will the outcome be as Asha predicted?
(c) What values are shown by ASHA? [value based question]
Answer:
(a) This process is known as crop rotation. All the plants/crops that grow in the soil use the minerals present in the soil for their own use. This continued use reduces the concentration of minerals in the soil.
(b) After growing leguminous plants, the mineral content of the soil is restored and enriched to a new level. Yes, the benefit of leguminous plants is the re-enrichment of soil minerals.
(c) Asha is attentive, honest, and interested in applying her knowledge in situations.
Important Topics Covered in NCERT Solutions for Class 7 Science Chapter 1 – Nutrition in Plants
- mode of nutrition in plants
- Photosynthesis – the process of making food in plants
- An alternative mode of nutrition in plants
Mortal
Supply of nutrients to the soil
NCERT Book for Class 7 Science Chapter 1 is colourful as it introduces you to the plant world around you. The curriculum has a variety of projects that will make the students enjoy the learning process. The course introduces you to new terminology and concepts, which will make you eager to study this chapter.NCERT Solutions for Class 7 Science Chapter 1 Nutrition in Plants.
In the chapter on Nutrition in Plants of class 7, students will be introduced to many new concepts related to plants and how they obtain nutrition for themselves, photosynthesis – the process of preparing food in plants, chlorophyll, stomata. Many other modes of nutrition in plants such as insectivorous plants.
This chapter will teach the basics of plant nutrients and how plants make their food, but reading this chapter carefully will help students understand the concepts of botany to a higher level. Hence it is highly recommended to prepare notes so that students can go through the notes while revising the chapter for the exam.
Apart from this, students will also get to know how nutrients are replenished in the soil, as we all know that the amount of nitrogen in the air is very high, but plants cannot take up nitrogen through the air, and Nitrogen is required in soluble form. . . A bacterium called Rhizobium can take up atmospheric nitrogen and convert it into a useful form.
Students are advised to solve previous year’s questions as well as sample papers. Solving sample papers and previous year papers will help them to know the exam pattern as well as the marking scheme.
NCERT Solutions for Class 7 Science Chapter 1 Nutrition in Plants Frequently Asked Questions on NCERT SOLUTIONS Class 7 Science Chapter 1.
What are the important topics covered in Chapter 1 of NCERT Solutions for Class 7 Science?
- Method of Nutrition in Plants
- Photosynthesis – the process of making food in plants
- The alternative mode of nutrition in plants
- Saprophytes
- Nutrient Supplementation in the Soil
NCERT Solutions for Class 7 Science Chapter 1 What are the benefits to farmers by growing fruit and vegetable crops inside a greenhouse?
The benefits to farmers by growing fruit and vegetable crops inside greenhouses are –
- Crops are protected from diseases and adverse climatic conditions.
- The crops are protected from rodents and wind.
To know more about this concept, students can get NCERT Solutions from NCERT Books PDF Solutions. All the questions in the textbook have precise solutions which help the students to take the exam without any fear.NCERT Solutions for Class 7 Science Chapter 1 Nutrition in Plants.
Questions. What will I learn from Chapter 1 of NCERT Solutions for Class 7 Science?
Chapter 1 of NCERT Solutions for Class 7 Science will introduce you to the world of plants.NCERT Solutions for Class 7 Science Chapter 1 Nutrition in Plants.
Various projects are included in the curriculum for the students to enjoy the learning process. The solutions also include new vocabulary and concepts to boost the confidence in the students to face the exam.
The basics of plant nutrients and how plants make their food are other concepts discussed in this chapter. It will provide a strong foundation of fundamental concepts among the students which will help them in a higher level of education.NCERT Solutions for Class 7 Science Chapter 1 Nutrition in Plants.
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