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Class 7 Exam  >  Class 7 Notes  >  Science Class 7  >  Important Questions: Nutrition in Plants

Important Questions for Class 7 Science - Nutrition in Plants

Fill in the blanks:

(i) All organisms take ______ and utilize it to get energy for growth and the maintenance of their bodies.
(ii) Green plants synthesize their food themselves by the process of ______ and are called ______.
(iii) ______ energy is stored by the leaves with the help of chlorophyll.
(iv) ______derive nutrition from dead, decaying matter.
(v) Plants like cuscuta take food from ______ plant.
(vi) All animals are categorized as ______.
(vii) ______ is produced and ______ is utilized during photosynthesis. 
Ans:
(i) All organisms take food and utilize it to get energy for growth and the maintenance of their bodies.

Important Questions for Class 7 Science - Nutrition in Plants  View Answer

Food provides essential nutrients and energy that organisms need for growth, repair, and maintenance of their bodily functions. Both plants and animals require food, though plants produce their own food through photosynthesis, while animals consume other organisms.

(ii) Green plants synthesize their food themselves by the process of photosynthesis and are called autotrophs

Important Questions for Class 7 Science - Nutrition in Plants  View Answer

Green plants, also known as autotrophs, create their own food using sunlight, water, and carbon dioxide through a process called photosynthesis. The word "autotroph" refers to organisms that produce their own food.

Important Questions for Class 7 Science - Nutrition in PlantsPhotosynthesis

(iii) Solar energy is stored by the leaves with the help of chlorophyll.

Important Questions for Class 7 Science - Nutrition in Plants  View Answer

Chlorophyll, the green pigment in plant leaves, captures solar energy and uses it to convert carbon dioxide and water into glucose during photosynthesis. This process stores solar energy in chemical bonds in the form of glucose.

(iv) Fungi/saprotrophs derive nutrition from dead, decaying matter.

Important Questions for Class 7 Science - Nutrition in Plants  View Answer

Fungi and other saprotrophs feed on dead and decaying organic matter. They break down complex substances into simpler nutrients that they can absorb, playing a key role in the recycling of nutrients in ecosystems.

(v) Plants like Cuscuta take food from the host plant.

Important Questions for Class 7 Science - Nutrition in Plants  View Answer

Cuscuta, a parasitic plant, lacks chlorophyll and cannot produce its own food. Instead, it attaches itself to a host plant and absorbs nutrients and water from the host, depending on it for survival.

(vi) All animals are categorized as Heterotrophs.

Important Questions for Class 7 Science - Nutrition in Plants  View Answer

Animals are heterotrophs, meaning they cannot produce their own food and must consume other organisms (plants or animals) to obtain energy and nutrients. Heterotrophs rely on autotrophs or other heterotrophs for their food.

Heterotrophs & AutotrophsHeterotrophs & Autotrophs

(vii) Oxygen is produced, and carbon dioxide is utilized during photosynthesis.

Important Questions for Class 7 Science - Nutrition in Plants  View Answer

During photosynthesis, plants absorb carbon dioxide from the atmosphere and use it to produce glucose, releasing oxygen as a byproduct. This oxygen is vital for the respiration of most living organisms, while the plants use glucose as a source of energy.

Choose the true (T) and false (F) statements:

(i) Food is essential for all living beings.
(ii) Leaves are the food factories of plants.  
(iii) Water comes into leaves through stomata in the form of vapours.  
(iv) Plants utilize the carbon dioxide dissolved in the water absorbed by the roots for photosynthesis.  
(v) The sun is the ultimate source of energy for all living organisms.  
(vi) Algae are saprotrophs.
(vii) Cuscuta is a parasite. 
(viii) Saprotrophs take their food in solution form from dead and decaying matter. 
(ix) Insectivorous plants are partial Heterotrophs. 
(x) Plants take atmospheric nitrogen through stomata and utilize a nutrient. 
(xi) The Pitcher plant is an insectivorous plant. 
(xii) Many fungi are saprotrophs. 
(xiii) The leaves of a plant are called its food factory. 
(xiv) Insectivorous plants eat insects to fulfill their needs for energy.

Ans:

(i) Food is essential for all living beings. 
Ans: True

Important Questions for Class 7 Science - Nutrition in Plants  View Answer

 All living organisms require food to obtain energy, grow, and maintain their bodily functions. Food provides essential nutrients needed for survival, such as carbohydrates, proteins, fats, vitamins, and minerals.

(ii) Leaves are the food factories of plants. 
Ans: True

Important Questions for Class 7 Science - Nutrition in Plants  View Answer

Leaves are known as the food factories of plants because they are the primary sites of photosynthesis. Through this process, plants convert sunlight, carbon dioxide, and water into glucose (a form of sugar) and oxygen, providing energy for growth and development.

Leaves are food factories of PlantsLeaves are food factories of Plants

(iii) Water comes into leaves through stomata in the form of vapours. 
Ans: False

Important Questions for Class 7 Science - Nutrition in Plants  View Answer

Water is absorbed by the roots from the soil and transported to the leaves through the plant's vascular system (xylem). While stomata allow water vapor to exit the leaves during transpiration, water does not enter leaves through stomata; it enters through the xylem in liquid form.

(iv) Plants utilize the carbon dioxide dissolved in the water absorbed by the roots for photosynthesis. 
Ans: False

Important Questions for Class 7 Science - Nutrition in Plants  View Answer

Plants primarily take in carbon dioxide from the atmosphere through the stomata in their leaves, not from water. While some carbon dioxide can dissolve in soil water, the majority comes from the air during the process of photosynthesis.

(v) The sun is the ultimate source of energy for all living organisms. 
Ans: True

Important Questions for Class 7 Science - Nutrition in Plants  View Answer

The sun provides energy that drives the process of photosynthesis in plants. This energy is then passed along the food chain to herbivores and carnivores, making sunlight the ultimate source of energy for all life on Earth.

Food ChainFood Chain

(vi) Algae are saprotrophs.
Ans: False

Important Questions for Class 7 Science - Nutrition in Plants  View Answer

Explanation: Algae are not saprotrophs; they are primarily photosynthetic organisms that produce their own food using sunlight. Saprotrophs, such as fungi and certain bacteria, feed on dead and decaying organic matter.

(vii) Cuscuta is a parasite.
Ans: True 

Important Questions for Class 7 Science - Nutrition in Plants  View Answer

Cuscuta, commonly known as dodder, is a parasitic plant that lacks chlorophyll and cannot photosynthesize. It attaches itself to host plants and derives nutrients and water from them, making it a true parasite.

(viii) Saprotrophs take their food in solution form from dead and decaying matter. 

Ans: True

Important Questions for Class 7 Science - Nutrition in Plants  View Answer

Saprotrophs, like fungi and some bacteria, decompose dead organic matter. They secrete enzymes that break down complex organic substances into simpler soluble forms, which they then absorb as nutrients.

Modes of NutritionModes of Nutrition(ix) Insectivorous plants are partial heterotrophs. 

Ans: True

Important Questions for Class 7 Science - Nutrition in Plants  View Answer

Insectivorous plants, like the Venus flytrap and pitcher plants, are considered partial heterotrophs because they primarily obtain energy through photosynthesis but also trap and digest insects to supplement their nutrient intake, particularly nitrogen.

(x) Plants take atmospheric nitrogen through stomata and utilize a nutrient. 
Ans: False

Important Questions for Class 7 Science - Nutrition in Plants  View Answer

 Plants do not take atmospheric nitrogen through stomata. Instead, nitrogen is fixed in the soil by certain bacteria or obtained from nitrogen-containing compounds in the soil. Stomata are responsible for the exchange of gases (like oxygen and carbon dioxide), not nitrogen.

(xi) The Pitcher plant is an insectivorous plant.
Ans: True

Important Questions for Class 7 Science - Nutrition in Plants  View Answer

The Pitcher plant is indeed an insectivorous plant. It has modified leaves that form a "pitcher" shape, which traps insects. The plant secretes digestive enzymes to break down the trapped insects and absorb the nutrients, aiding in its growth.

Pitcher PlantPitcher Plant

(xii) Many fungi are saprotrophs.
Ans: True

Important Questions for Class 7 Science - Nutrition in Plants  View Answer

Many fungi are saprotrophic, meaning they obtain their nutrients by decomposing dead organic matter. They play a vital role in nutrient cycling in ecosystems by breaking down complex organic substances into simpler forms.

(xiii) The leaves of a plant are called its food factory.
Ans: True

Important Questions for Class 7 Science - Nutrition in Plants  View Answer

Leaves are often referred to as the food factory of the plant because they are the main site of photosynthesis, where sunlight, carbon dioxide, and water are converted into glucose and oxygen.

(xiv) Insectivorous plants eat insects to fulfill their needs for energy. 

Ans: True

Important Questions for Class 7 Science - Nutrition in Plants  View Answer
 Insectivorous plants consume insects to obtain nutrients, especially nitrogen, which is often limited in their growing environments. This adaptation allows them to thrive in nutrient-poor soils.

Short & Long Answer Type Questions

Q.1. Define
(a) Parasites

Ans: The organisms that depend on other living organisms for food are called parasites.
Examples: Cuscuta, tapeworm, liver fluke, etc. There are two types of parasites: 

  1. Total parasite
  2. Partial parasite

Example of Parasite: TapewormExample of Parasite: Tapeworm

(b) Total Parasites 

Ans: The parasites that depend on the host for food and shelter are called total parasites. For example, liver fluke and tapeworm.

(c) Partial Parasites

Ans: Those parasites dependent on the host only for food are called partial parasites. For example, mosquitoes and lice.

Q.2. What is Symbiosis? What is a symbiotic relationship?

Ans: 

  • Symbiosis is the type of nutrition in which two different kinds of organisms depend on each other for their nutrition. In this relationship, both organisms benefit from each other. 
  • Example: Lichen. In this one, algae and one fungus live together and remain symbiotic.
    Symbiotic Relationship
    Symbiotic Relationship
  • Symbiotic Relationship: Some organisms live together and share shelter and nutrients. This type of relationship is called a symbiotic relationship.

Q.3. What are stomata? Explain their function.

Ans: 

  • Stomata are tiny pores on the underside of the leaf surface that are surrounded by guard cells. 
  • Their functions are to exchange gases by diffusion for photosynthesis and respiration and to cause transpiration by evaporation of water from the leaf surface.

StomataStomata

Q.4. How does the plant use sunlight for photosynthesis?

Ans: 

  • Sunlight is the energy source for photosynthesis. 
  • It is trapped by the green pigment chlorophyll in the leaves and all green parts of the plants. 
  • The chlorophyll is present in organelles called chloroplasts.
  • Most of the chlorophyll is present in the leaves; therefore, leaves are the major site for trapping sunlight to convert it to chemical energy.

Chloroplasts contain ChlorophyllChloroplasts contain Chlorophyll

Q.5. Explain how photosynthesis occurs in plants.

Ans: Photosynthesis is a vital process that allows green plants to make their own food using sunlight. 
Here’s how it works:

  • Energy Source: Plants use solar energy (sunlight) to create food.
  • Raw Materials: The two main ingredients needed for photosynthesis are:
    - Carbon Dioxide (CO₂): This gas comes from the air and is absorbed by the plant's leaves.
    - Water (H₂O): Plants take up water from the soil through their roots.
  • Role of Chlorophyll: The leaves of plants contain a green pigment called chlorophyll, which is essential for photosynthesis. Chlorophyll captures sunlight, providing the energy needed for the process.
  • Chemical Reaction: Using the energy from sunlight, plants transform carbon dioxide and water into glucose (a type of sugar) and oxygen (O₂). The overall chemical reaction for photosynthesis can be summarized as:

Reaction of PhotosynthesisReaction of Photosynthesis

  • Products of Photosynthesis: The main product of photosynthesis is glucose, which serves as food for the plant. Oxygen is also produced and released into the atmosphere, which is essential for all living beings to breathe.

Q.6. How can we demonstrate that chlorophyll is necessary for photosynthesis?

Ans: Here’s a simple experiment to show that chlorophyll is necessary for photosynthesis:
Materials Needed:

  • A potted plant with variegated leaves (green and non-green parts)
  • Boiling water
  • Ethanol (alcohol)
  • Iodine solution
  • Light source (sunlight or lamp)

Variegated LeavesVariegated LeavesSteps:

  1. Prepare the Plant:

    • Take a variegated leaf from the plant.
    • Keep the plant in the dark for 24 hours.

  2. Boil the Leaf:

    • Boil the leaf in water for 2-3 minutes to kill it.

  3. Decolorize the Leaf:

    • Place the boiled leaf in a beaker with ethanol and heat it in a hot water bath for 5-10 minutes. This removes chlorophyll and turns the leaf pale.

  4. Stain with Iodine:

    • Rinse the leaf in warm water, then soak it in iodine solution for a few minutes. Iodine will turn blue-black in the presence of starch.

  5. Observe the Results: The green parts turn blue-black, indicating starch is present (photosynthesis occurred).
    The non-green parts stay yellow or brown, showing no starch (no photosynthesis).

Important Questions for Class 7 Science - Nutrition in Plants

Conclusion:

  • The experiment shows that only the green parts of the leaf, which contain chlorophyll, can make food (starch) through photosynthesis. Non-green parts do not have chlorophyll and cannot perform photosynthesis.

Q.7. How do plants obtain nutrients other than carbohydrates?

Ans: Plants primarily produce carbohydrates through photosynthesis, using sunlight to convert carbon dioxide and water into starch. However, they obtain other essential nutrients directly from the soil. Here’s how this process works:

  • Nutrient Absorption: Plants absorb nitrogen from the soil in the form of nitrates and ammonium.
  • Role of Nitrogen-Fixing Bacteria: Nitrogen compounds in the soil are created by nitrogen-fixing bacteria, such as Rhizobium. These bacteria live in a symbiotic relationship with the roots of leguminous plants, helping to convert atmospheric nitrogen into forms that plants can use.

Rhizobium: Nitrogen Fixing BacteriaRhizobium: Nitrogen Fixing Bacteria

  • Replenishing Nutrients: Farmers can replenish nitrogen compounds in the soil by adding fertilizers and manure. These additions enrich the soil, providing essential nutrients for plant growth.
  • Insectivorous Plants: Some plants, like the pitcher plant and Venus flytrap, obtain nitrogen by trapping and digesting insects. This process releases nutrients from the insects, which are then absorbed by the plant.

Q.8. What is the mode of nutrition in fungi?

Ans: 

  • The mode of nutrition in fungi is heterotrophic. 
  • They cannot synthesize their food and depend on other ‘organisms’ for their carbon source. 
  • They perform extracellular digestion by releasing enzymes into their environment and obtaining organic and inorganic nutrients through absorption.  
  • There are three main ways of obtaining nutrition in Heterotrophic Mode are:  
    (i) Saprotrophic: Decomposition of ‘dead organic matter’.  
    (ii) Parasitic: Feeding from a living host.
    (iii) Mutualism: Living in a mutually beneficial interaction with another organism. (Example: lichen is a mutualism between fungi and algae).
The document Important Questions for Class 7 Science - Nutrition in Plants is a part of the Class 7 Course Science Class 7.
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FAQs on Important Questions for Class 7 Science - Nutrition in Plants

1. What is the process of photosynthesis in plants?
Ans.Photosynthesis is the process by which green plants use sunlight, carbon dioxide, and water to produce glucose and oxygen. Chlorophyll, the green pigment in leaves, captures sunlight, which helps convert carbon dioxide from the air and water from the soil into energy-rich glucose, which serves as food for the plant.
2. How do plants obtain nutrients from the soil?
Ans.Plants absorb nutrients from the soil through their roots. The roots take up water and dissolved minerals, which are essential for the plant's growth and development. These nutrients include nitrogen, phosphorus, potassium, and other trace elements that are crucial for various physiological functions.
3. What role do fungi play in plant nutrition?
Ans.Fungi form symbiotic relationships with plant roots, known as mycorrhizae. These fungi help plants absorb water and nutrients more efficiently, particularly phosphorus. In return, the plants provide the fungi with carbohydrates produced during photosynthesis, creating a mutually beneficial relationship.
4. Why are legumes important for soil fertility?
Ans.Legumes are important for soil fertility because they have the ability to fix atmospheric nitrogen into the soil through a process facilitated by bacteria in their root nodules. This nitrogen enriches the soil, making it more fertile and beneficial for subsequent crops, thus improving agricultural productivity.
5. What are the different types of nutrition in plants?
Ans.Plants mainly exhibit autotrophic nutrition, where they produce their own food through photosynthesis. However, some plants, like carnivorous plants, exhibit heterotrophic nutrition by capturing and digesting other organisms to obtain nutrients, especially in nutrient-poor environments.
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