MP Board Class 7 Science Chapter 1 Nutrition in Plants

In this article we have Share MP Board Solutions Class 7th Science Chapter 1 Nutrition in Plants Including Intext Questions, Objective Questions like Match The pair, Fill in the blanks and Important Questions and answers of Science Chapter 1 for Class 7.

Intext Questions

Question 1.
Boojho wants to know how plants prepare their own food?
Answer:
Plants are the only organisms that can produce their own food through the process of photosynthesis, which utilizes water, carbon dioxide, and minerals.

Question 2.
Paheli wants to know why our body cannot make food from carbon dioxde, water and minerals like plants do?
Answer:
The human body does not contain chlorophyll.

Question 3.
Boojho wants to know how water and minerals absorbed by roots reach the leaves?
Answer:
Plant’s nutrients such as water and minerals are transported to the leaves through the vessels running like pipes throughout its roots, stems, and leaves. These vessels create a continuous pathway for the nutrients to reach the leaves.

Question 4.
Paheli wants to know what is so special about the leaves that they can synthesize food but other parts of the plant cannot?
Answer:
Due to the presence of a green pigment called chlorophyll in the leaves.

Question 5. Boojho has observed some plants with deep red, violet or brown leaves. He wants to know whether these leaves also carry out photosynthesis?
Answer: No.

Question 6.
Paheli wants to know whether mosquitoes, bed bugs, lice and leeches that suck our blood are also parasites?
Answer:
Lice are considered as parasites, while mosquitoes are not classified as such because they use blood to incubate their eggs rather than for nourishment.

Question 7.
Boojho is confused. If the pitcher plant is green and carries out photosynthesis, then why does it feed on insects?
Answer:
Due to the fact that these plants do not receive sufficient nutrition from the soil as needed.

Question 8.
Boojho wants to know how these organisms acquire nutrients. They do not have mouths like animals do. They are not like green plants as they lack chlorophyll and cannot make foFungal spores are commonly found in the air, and when they land on moist and warm surfaces, they germinate and grow. During the rainy season, there is a higher likelihood of surfaces becoming wet, therefore increasing the chance of fungi causing spoilage.od by photosynthesis?
Answer:
These organisms acquire food from dead organisms.

Question 9.
Paheli is keen to know whether her beautiful shoes, which she wore on special occasions, were spoiled by fungi during the rainy season. She wants to know how fungi appear suddenly during the rainy season?
Answer:
Fungal spores are commonly found in the air, and when they land on moist and warm surfaces, they germinate and grow. During the rainy season, there is a higher likelihood of surfaces becoming wet, therefore increasing the chance of fungi causing spoilage.

Question 10.
Boojho says once his grandfather told him that his wheat fields were spoiled by a fungus. He wants to know if fungi cause diseases also?
Answer:
Fungi can cause diseases in plants, animals, and humans, but some species of fungi also have medicinal uses.

Text book Exercises

Below we have shared mp board class 7 science solutions chapter 1 textbook exercise questions and answers solutions.

Question 1.
Why do organisms need to take food?
Answer:
All living organisms require food for the following purposes:

  1. To obtain energy for performing tasks.
  2. To construct and maintain the body.
  3. To enhance resistance to diseases and protect against infections.
  4. To repair and replace damaged parts of the body.
  5. To sustain the body’s functions.

Question 2.
Distinguish between a parasite and a saprotroph?
Answer:
Distinguish Parasite and Saprotroph:

Parasite:

  1. They obtain nutrients from other living organisms.
  2. They utilize heterotrophic mode of nutrition.
  3. They mostly reside on or within the host organism.
  4. Examples: tapeworms, roundworms, mistletoe, rust fungi, etc.

Saprotroph:

  1. They obtain nutrients from dead and decaying organisms.
  2. They use saprotrophic mode of nutrition.
  3. They inhabit dead and decaying material.
  4. Examples: mushrooms, bacteria, yeast, etc.

Question 3.
How would you test the presence of starch in leaves?
Answer:
Starch Test:
To test for the presence of starch in a green leaf, follow these steps:

  1. Boil the leaf in water for approximately 5 minutes.
  2. Immerse the leaf in 60% amyl alcohol heated to 60°C until it becomes colorless.
  3. Remove the leaf from the alcohol and wash it with cold water.
  4. Apply a few drops of dilute iodine solution to the leaf. The leaf will turn a deep blue color, indicating the presence of starch in the leaf.

Question 4.
Give a brief description of the process of synthesis of food in green plants?
Answer:
The leaves contain a green pigment called chlorophyll, which enables them to absorb the energy from sunlight. This energy is utilized to convert carbon dioxide and water into food through a process known as photosynthesis. The name “photosynthesis” is derived from the Greek words “photo” meaning light, “synthesis” meaning to combine, as this process occurs in the presence of sunlight.

Therefore, it can be deduced that chlorophyll, sunlight, carbon dioxide, and water are essential components for the process of photosynthesis. This process is unique to the earth and is responsible for capturing solar energy and converting it into food, stored within the plant. Thus, the sun serves as the ultimate source of energy for all living organisms.

Process of synthesis of food

As a byproduct of the process, oxygen is released. The process culminates in the conversion of carbohydrates into starch. The presence of starch in leaves serves as evidence of photosynthesis taking place. It should be noted that starch is a type of carbohydrate.

Synthesis of food in green plants

Question 5.
Show with the help of a sketch that the plants are the ultimate source of food?
Answer:

Ultimate source of food

Question 6. Fill In The Blanks:

  1. Green plants are called …………….. since they synthesise their own food.
  2. The food synthesised by the plants is stored as ……………..
  3. In photosynthesis solar energy is captured by the pigment called ……………..
  4. During photosynthesis plants take in …………….. and release

Answer:

  1. Autotrophs
  2. Starch
  3. Chlorophyll
  4. Carbon dioxide, oxygen.

Question 7.
Name the following:

  1. A parasitic plants with yellow, slender and tubular stem.
  2. A plant that has both autotrophic and heterotrophic mode of nutrition.
  3. The pores through which leaves exchange gases.

Answer:

  1. Cuscuta (Amarbel)
  2. Pitcher plant
  3. Stomata.

Question 8.
Tick the correct answer:
(a) Amarbel is an example of –
(i) Autotroph (ii) Parasite (iii) Saprotroph (iv) Host.
Answer:
(ii) Parasite

(b) The plant which trape and feeds on insects is –
(i) Cuscuta (ii) China rose (iii) Pitcher plant (iv) Rose.
Answer:
(iii) Pitcher plant.

Column I

(i) Chlorophyll
(ii) Nitrogen
(iii) Amarbel
(iv) Animals
(v) Insects

Column II

(a) Bacteria
(b) Heterotrophs
(c) Pitcher Plant
(d) Leaf
(e) Parasite.

Answer:

(i) (d)
(ii) (a)
(iii) (e)
(iv) (b)
(v) (c)

Question 10. Mark “T” if the statement is true and “F” if it is false:

  1. Carbon dioxide is released during photosynthesis. (T/F)
  2. Plants which synthesise their food themselves are called saprotrophs. (T/F)
  3. The product of photosynthesis is not a protein (T/F)
  4. Solar energy is converted into chemical energy during photosynthesis. (T/F)

Answer:

  1. False (F)
  2. False (F)
  3. True (T)
  4. True (T)

Question 11. Choose the correct option from the following:
Which part of the plant gets carbon dioxide from the air for photosynthesis –
(i) Root hair (ii) Stomata (iii) Leaf veins (iv) Sepals.
Answer:
(ii) Stomata.

Question 12.
Chose the correct option from the following:
Plants take carbon dioxide form the atmosphere mainly through their –
(i) Roots (ii) Stem (iii) Flowers (iv) Leaves.
Answer:
(iv) Leaves.

Nutrition in Plants Additional Important Questions

Objective Type Questions

Question 1. Choose the correct alternative:

Question (i)
The green coloured pigment present in plants is ………….
(a) Xanthophyll
(b) Haemoglobin
(c) Chlorophyll
(d) None of these.
(c) Chlorophyll

Question (ii)
The life processes that provide energy are ……………
(a) Respiration (b) Nutrition (c) Both respiration and nutrition (d) None of these.
Answer:
(c) Both respiration and nutrition

Question (iii)
Which of these are autotrophs …………..
(a) Green plants (b) All plants (c) All animals (d) None of these.
Answer:
(a) Green plants

Question (iv)
………….. changes solar energy into chemical energy.
(a) Oxygen (b) Carbon – di – oxide (c) Water (d) Chlorophyll.
Answer:
(d) Chlorophyll.

Question (v)
………….. is saprophyte.
(a) Fungus (b) Cuscuta (c) Money plant (d) Mosquito.
Answer:
(a) Fungus

Fill in the blanks:

  1. Resin, gum, latex are ……………. substances of plants.
  2.  …………….. is the mode of taking food by an organism and its utilisation by the body.
  3. The plant on which it climbs is called a ……………
  4. Plants which use saprotrophic mode of nutrition are called …………..
  5. Oxygen is produced during ……………..

Answer:

  1. Excretory, 2. Nutrition, 3. Host, 4. Saprotrophs, 5. Photosynthesis.

Question 3.
Which of the fallowing statements are true (T) or false (F):

  1. All organisms take food and utilise it to get energy for the growth and maintenance of their bodies.
  2. Chlorophyll and sunlight are not the essential requirements for photosynthesis.
  3. Solar energy is stored by the leaves with the help of chlorophyll.
  4. Oxygen is not produced during photosynthesis.
  5. Only a few plants adopt other modes of nutrition like parasitic and saprotraphic.

Answer:

  1. True (T)
  2. False (F)
  3. True (T)
  4. False (F)
  5. True (T).

Match the items is Column A with Column B:

Column A

(i) A gas used in photosynthesis
(ii) A plant which can eat insects
(iii) Tiny pores in Leaves
(iv) Pigment which gives green colour to leaves.

Column B

(a) Stomata
(b) Carbondioxide
(c) Chlorophyll
(d) Pitcher Plant.

Answer:

(i) (b)
(ii) (d)
(iii) (a)
(iv) (b).

Question 5. Name the following :

  1. A plants food factory.
  2. Living on another organisms and derive food from them.
  3. A chlorophyll containing partner, which is an alga, and a fungus live together.

Answer:

  1. Leaf
  2. Parasitic
  3. Lichens

Very Short Answer type Questions

Question 1.
How many types of nutritions are there?
Answer:
Nutrition can be divided into two categories: autotrophic nutrition and heterotrophic nutrition.

Question 2.
How do symbiotic live?
Answer:
Symbiotic relationships involve a host organism and a parasite that benefits from the host

Question 3.
What are autotrophs? Give examples.
Answer:
Organisms that are able to produce their own food by utilizing sunlight, carbon dioxide, and water are known as autotrophs.
Examples: All green plants are examples of autotrophs.

Question 4.
Define photosynthesis?
Answer:
The process by which green plants produce food by converting carbon dioxide and water into organic compounds in the presence of chlorophyll and light is called photosynthesis.

Question 5.
What is the function of chlorophyll?
Answer:
Chlorophyll enables leaves to absorb the energy from the sun.

Question 6.
What are algae?
Answer:
Algae are the green, slimy patches found in ponds or other stagnant water bodies.

Question 7.
What is the purpose of starch test?
Answer:
To determine the presence of starch in green plants

Question 8.
Name two herbivorous animals?
Answer:
Deer, cow.

Question 9.
Name two omnivorous animals?
Answer:
Dog, cat.

Question 10.
Name two carnivorous animals?
Answer:
Tiger, lion.

Question 11.
Name two leguminous plants?
Answer:
Gram, pea.

Question 12.
Name two insectivorous plants?
Answer:
Sundew, Aldrovenda.

Question 13.
Which bacteria can convert nitrogen into soluble term?
Answer:
Rhizobium.

Question 14.
Define autotrophs?
Answer:
Green plants produce their own food through the process of photosynthesis, making them autotrophic organisms.

7th Science Chapter 1 Short Answer Type Questions

Question 1.
How do the exchange of gases occur in plants?
Answer:
In plants, the lower surface of leaves contains small openings called stomata, which are regulated by two guard cells. The guard cells control the opening or closing of the stomata. When the concentration of oxygen gas increases during photosynthesis, the guard cells open, allowing the release of oxygen gas. During respiration, when the concentration of carbon dioxide gas increases, the guard cells cause the release of carbon dioxide gas. This is how gas exchange occurs in plants.

Question 2.
How many types of heterotrophs are there? Give examples.
Answer:
Organisms that rely on other organisms, such as plants, for their food source are referred to as heterotrophs. Heterotrophs can be further divided into different categories.

1. Herbivorous Animals:
The organisms or animals who eat plants and plant products.
Examples: cow, horse, goat, etc.

2. Carnivorous Animals:
The animals who eat flesh of other animals are called carnivorous.
Examples: lion, tiger, wolf, etc.

3. Omnivorous Animals:
The animals who eat both plant and animals are called ominivorous animals.
Examples: man, cat, dog, crow, etc.

Question 3.
W’hat is the difference between ‘heterotrophs and autotrophs’?
Answer:
The differences between two are:

Heterotroph:

  1. These are organism which can not make their own food.
  2. They do not have chloroplast.

Autotroph:

  1. They can make their own food.
  2. They have chloroplast.

Question 4.
Give two examples of insectivorous plants?
Answer:
Plants that have adapted specialized mechanisms to capture and kill insects are known as insectivorous plants. Examples of insectivorous plants include pitcher plants and Venus flytrap. The pitcher plant features modified leaves that resemble a pitcher, which trap and kill insects that come into contact with it.

Question 5.
What is the difference between holophytic and holozoic type of nutrition?
Answer:
Organisms, such as plants, that are able to produce their own food are known as autotrophic, and this type of nutrition is referred to as autotrophic nutrition or holophytic nutrition.

Organisms that are unable to produce their own food and instead rely on other living beings for sustenance are known as heterotrophic, and this type of nutrition is referred to as heterotrophic nutrition or holozoic nutrition.

Question 6.
How is Sun the ultimate source of energy for all the living beings?
Answer:
Green plants produce food by utilizing sunlight. All other organisms, either directly or indirectly, rely on green plants for their sustenance. Therefore, the sun is the ultimate source of energy for all living organisms.

Question 7.
How is holophytic nutrition different from holozoic nutrition?
Answer:
1. Autotrophic nutrition is observed in plants and some lower forms of animals that consume liquid food as they lack a digestive system.

2. Heterotrophic nutrition is found in humans and other higher forms of animals, which possess a well-developed digestive system that allows them to consume solid food.

Long Answer Type Questions

Below we have shared MP Board 7th Science Chapter 1 long answer type questions.

Question 1.
Draw a diagram of stomata?
Answer:

Diagram of Stomata

Question 2.
Give an experiment to demonstrate that light is necessary for photosynthesis?
Answer:
To test for the presence of starch in a broad-leaved potted plant, take the following steps:

  1. Place the plant in complete darkness for 24-48 hours to deplete the starch.
  2. Secure a leaf that is still attached to the plant with a paper clip on a black paper.
  3. Expose the plant to light for a few hours, then test the leaf for starch.
  4. To test the leaf, pluck it and kill the cells by boiling it in water.
  5. Remove the chlorophyll by boiling the leaf in alcohol.
  6. Rinse the boiled leaf with water and treat it with an iodine solution.
Digram of Black Paper plant

It is observed that the section of the leaf exposed to sunlight turned blue in color, while the covered portion remained unchanged. This is due to the fact that starch gives a blue color when treated with iodine solution. This occurs because the covered portion did not receive any sunlight, indicating that sunlight is a crucial component for photosynthesis to take place.

Question 3.
Describe the process of nutrition in hydra?
Answer:
Hydra uses its tentacles to capture and ingest food. The cells lining the body cavity secrete specific chemicals and enzymes to breakdown the food. The digested food is then absorbed by the cells in the body cavity walls through diffusion. As a result of eating, the hydra grows and reproduces by forming buds.

Process of Nutrition in hydra diagram

Question 4.
Define cell with their structure
Answer:
The structure of living organisms is composed of tiny units known as cells. These cells can only be viewed under a microscope. Some organisms consist of a single cell. The cell is enclosed by a thin outer boundary called the cell membrane. Most cells have a distinct, centrally located spherical structure known as the nucleus. The nucleus is surrounded by a jelly-like substance called cytoplasm.

cell with their structure Diagram

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