Last updated on August 30th, 2023 at 01:57 am
Class 7 Nutrition in Plants
Nutrition in Plants Class 7 Notes | Nutrition in Plants Class 7 Extra Questions with Answers.
Fill in the blanks:-
- Insectivorous plants grow in soil that is poor in …….[nutrients]
- ……….are organisms that are dependent on other organisms.[ Parasites]
- A ……is the result of a symbiotic relationship between algae and fungi.[ lichen]
- ……..plants obtain their nutrition from dead and decaying matter.[ Saprophytic]
- Parasitic plants obtain their food from other living organisms called ……[host]
- Light is converted into ………energy during photosynthesis.[ chemical]
- Food produced by plants is stored in the form of ……….[starch]
Answer in One Word
QUE – Name the pores through which leaves exchange gases.
ANS- Stomata
QUE – Name the process by which plants produce food.
ANS- Photosynthesis
QUE – Give the name of a gas that is used in photosynthesis.
ANS- Carbon di-oxide
QUE – Name a gas that is produced during photosynthesis.
ANS- Oxygen
QUE – Name the green pigment found in plant leaves.
ANS- Chlorophyll
QUE – Identify a parasitic plant with a yellow, slender, tubular stem.
ANS- Amarbel [cuscuta ]
Answer in short
QUE – Define Nutrition:
The process of taking food by an organism as well as the utilization of this food by the organism is called nutrition.
QUE – Define Autotrophs:
Autotrophs are organisms that make their own food from simple substances through photosynthesis. Most green plants are autotrophs.
QUE – Define Heterotrophs:
Heterotrophs are organisms that can’t produce food by photosynthesis and must eat green plants or animals. All non-green plants and animals (including human beings) are heterotrophs.
QUE – Define Starch:
The process of photosynthesis first produces a simple carbohydrate called glucose. Glucose is then converted into starch, a complex carbohydrate. Various parts of plants, including leaves, store this starch as food.
QUE – Define Chlorophyll:
The chlorophyll in leaves absorbs light energy from the sun and uses it for photosynthesis, which produces food.
QUE – Define Parasite:
A parasite is an organism that lives on or inside another organism (called a host) and derives its food from that organism. Cuscuta is an example of a parasite plant. Its Hindi name is Amarbel. There is no chlorophyll in the Cuscuta plant.
QUE – Define Insectivorous Plants:
Insectivorous plants are those that consume insects as part of their diet. Common insectivorous plants include: Pitcher plant, Sundew, Venus fly-trap and Bladderwort.An insectivorous plant consumes insects for nitrogen compounds required for its growth.
QUE – Define Symbiotic Plant:
Plants living together as if they are one plant can be called symbiotic (and such plants are called symbiotic plants).
QUE – What is symbiosis?
The term ‘symbiosis’ refers to a relationship between two organisms that is mutually beneficial to both of them.
What is nutrition?
Nutrition is the process of taking in food by an organism to obtain energy, materials for growth, and materials for repairing damaged body parts.
How do plants and animals obtain their food?
Plants can make their own food, while animals, including humans, cannot make food themselves. Animals obtain food from plants or other animals that eat plants.
What is the role of chlorophyll in photosynthesis?
Chlorophyll is a green pigment present in the leaves of green plants, which absorbs sunlight energy required for the process of photosynthesis.
What is the equation for photosynthesis?
The equation for photosynthesis is:
Carbon dioxide + Water + Sunlight energy (in the presence of chlorophyll) → Glucose + Oxygen.
What happens to the Oxygen produced during photosynthesis?
The Oxygen produced during photosynthesis goes into the air and is utilized by all living organisms for survival.
What is the first simple carbohydrate produced during photosynthesis?
The first simple carbohydrate produced during photosynthesis is glucose.
What is the function of chlorophyll in the process of photosynthesis?
Chlorophyll is necessary for capturing sunlight energy to produce food during photosynthesis.
What are the common parts of an animal cell?
A: The common parts of an animal cell include the cell membrane, cytoplasm, nucleus, mitochondria, and small vacuoles.
What is the function of the cell membrane?
A: The function of the cell membrane is to protect the cell and control the passage of materials in and out of the cell.
What is the function of the nucleus?
A: The function of the nucleus is to control all the activities of the cell.
What is the function of mitochondria?
A: The function of mitochondria is to carry out respiration to release energy from food.
What are the additional parts present in plant cells?
A: The additional parts present in plant cells are the cell wall, chloroplasts, and large vacuoles.
What is the function of the cell wall in plant cells?
A: The function of the cell wall in plant cells is to protect the cell, give it a fixed shape, and make it rigid.
What is a cell?
A: A cell is the smallest unit of life and the building block of all living organisms.
QUE – What is the significance of algae?
According to scientists, algae generate about 87 percent of the world’s oxygen and remove excess carbon dioxide from the atmosphere. They are believed to be an important factor in preventing global warming and climatic changes.
QUE – Differentiate between autotrophs and heterotrophs
Autotrophs are organisms that prepare their food on their own and have chlorophyll. For example, green plants and algae.
Heterotrophs rely on other organisms for nutrition and do not have chlorophyll.es are animals and fungi.
QUE – Define Saprophytic plants:
Saprophytic plants are plants that live on the dead and decaying organic matter of animals and plants. Enzymes are secreted by these plants that break down complex organic matter into simple ones, e.g., Indian pipe, mushrooms
QUE – Describe the different ways that farmers can replenish the soil.
Farmers can replenish the soil in several ways:
- Keeping field fallow
- Crop rotation
- Adding fertilizers
- To grow cover crops
What is an autotrophic mode of nutrition?
The autotrophic mode of nutrition means organisms can produce their own food using sunlight, carbon dioxide, and water, and hence, most plants have an autotrophic mode of nutrition.
Why can’t animals make their own food?
Animals, including humans, cannot make their own food because they do not have the green pigment chlorophyll, which is necessary for the process of photosynthesis.
What is the role of chlorophyll in photosynthesis?
Chlorophyll is necessary to absorb energy from sunlight required for making food by photosynthesis.
What is photosynthesis?
Photosynthesis is the process by which green plants make their own food, such as glucose, from simple inorganic substances like carbon dioxide and water, in the presence of sunlight energy and chlorophyll.
What is necessary for plants to obtain carbon dioxide for photosynthesis?
Plants obtain carbon dioxide for photosynthesis through the tiny pores called stomata present on the surface of leaves. The carbon dioxide gas present in the air enters the leaves of a plant through these stomatal pores.
How do plants obtain water for photosynthesis?
Plants absorb water from the soil through their roots and transport it to the leaves through interconnected pipe-like xylem vessels present throughout the plant.
What is the role of chlorophyll in photosynthesis?
Chlorophyll absorbs light energy from the sun and supplies this energy to the leaves to enable them to carry out photosynthesis to make food.
What are algae, and how do they produce food?
Algae are simple, plant-like organisms that contain chlorophyll and produce food by photosynthesis, just like plants. They differ from plants because they do not have proper roots, stems, and leaves. Algae can be found in patches of slimy, green layers on the surface of ponds, lakes, rivers, and even in stagnant parts of swimming pools.
What is the simplest food synthesized by plants through photosynthesis?
The simplest food synthesized by plants through photosynthesis is a simple carbohydrate called ‘glucose.’
What are the reasons why photosynthesis is important for the existence of life on Earth?
Photosynthesis provides food for animals (including humans) and puts oxygen gas into the air, which animals (including humans) use for breathing and respiration.
What are fertilizers and manures?
Fertilizers and manures contain plant nutrients (or minerals) such as nitrogen, phosphorus, potassium, etc.
Why are fertilizers and manures added to the soil in fields?
Fertilizers and manures are added to the soil in fields to enrich the soil with essential nutrients like nitrogen, phosphorus, potassium, etc., which helps in the growth of crops.
What is NPK fertilizer, and what plant nutrients does it provide?
NPK fertilizer provides Nitrogen (N), Phosphorus (P), and Potassium (K) to the soil in fields.
Why do crop plants grown in fields require nitrogen in maximum amounts?
Crop plants grown in fields require nitrogen in maximum amounts to make proteins.
Why does the soil in fields become deficient in nitrogen after harvest?
The soil in fields becomes deficient in nitrogen after harvest because crop plants take nitrogen from the soil to make proteins.
How can nitrogen-deficient soil become fertile again?
Nitrogen-deficient soil can become fertile again by adding nitrogen-containing fertilizers or by growing leguminous crops in the soil.
Why can’t plants use nitrogen in gaseous form?
Plants need nitrogen in the form of water-soluble compounds like nitrates, which they can absorb through their roots.
What are leguminous plants?
Leguminous plants or legumes are plants like gram (chana), peas, pulses (moong, etc.), and beans which have root nodules containing Rhizobium bacteria.
How do growing leguminous crops in a field benefit farmers?
Growing leguminous crops in a field enriches the soil with nitrogen compounds in a natural way, eliminating the need for farmers to put nitrogen fertilizers in the fields. This saves them a lot of money.
How are living organisms made up of cells?
A: Just like a house is made up of bricks, living organisms are made up of tiny units called cells.
What is the difference between unicellular and multicellular organisms?
A: Unicellular organisms are made up of only one cell, while multicellular organisms are made up of many cells.
What is the function of chloroplasts in plant cells?
A: The function of chloroplasts in plant cells is to contain chlorophyll and make food by the process of photosynthesis.
How are animals and plants different based on their cells?
A: Animals and plants are different based on their cells because they are made up of different types of cells, which results in differences in their appearance and behavior.
