I have expertise in making educational and other PPTs. Email me for more PPTs at a very reasonable price that perfectly fits in your budget. Email: parmarshivam105@gmail.com Chapter 1 - Nutrition in Plants, Science, Class 7 INTRODUCTION NUTRIENTS MODE OF NUTRITION CELLS IN LIVING ORGANISMS SINGLE AND MULTI - CELLULAR ORGANISMS HOW DO PLANTS PREPARE THEIR FOOD? PROCESS OF PHOTOSYNTHESIS ULTIMATE SOURCE OF ENERGY FOR ALL LIVING ORGANISMS HOW DO PLANTS GENERATE PROTEINS AND FATS OTHER MODES OF NUTRITION PARASITIC MODE OF NUTRITION INSECTIVOROUS MODE OF NUTRITION SAPROPHYTIC MODE OF NUTRITION SYMBIOTIC MODE OF NUTRITION REPLENISHING THE SOIL WITH NUTRIENTS Every topic of this chapter is well written concisely and visuals will help you in understanding and imagining the practicality of all the topics. By Shivam Parmar (Entrepreneur)

1. CHAPTER – 1
NUTRITION IN PLANTS
BY SHIVAM PARMAR
(ENTREPRENEUR & TEACHER)

2. INTRODUCTION
◦ Living organisms such as plants and animals survive
on food.
◦ The food gives them the energy to perform several
activities in their life and helps in the growth.
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3. NUTRIENTS
◦ Nutrients - Certain substances are present in the foods that
help in the survival of the organisms. These special substances
are called nutrients for example, proteins, vitamins,
carbohydrates, minerals and fats.
◦ Some living organisms like plants synthesize their food by
themselves while others such as animals depend upon the plants
and other animals for their food.
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4. MODE OF NUTRITION
IN PLANTS
Based on the mode of nutrition
organisms can be divided into two
categories:
◦ Autotrophic Organisms - They
can prepare their food by
themselves such as plants
◦ Heterotrophic Organisms - They
depend upon other organisms for
their food such as animals
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5. CELLS IN LIVING ORGANISMS
Cells are tiny units that help make up a living organism. Hence they
are also called building blocks of an organism.
A cell is constituted of three major parts :
◦ A thin outer layer called the cell membrane.
◦ A spherical structure located at the centre of the cell called
a nucleus.
◦ A jelly-like substance that surrounds a nucleus called
the cytoplasm. 5

6. SINGLE AND MULTI-CELLULAR
ORGANISMS
◦ Organisms that are made up of just one cell are called
single-celled or Unicellular organisms. E.g. Amoeba
◦ Organisms with more than one cell in their body are
called multicellular organisms.
◦ All human beings, plants and animals are multicellular
organisms.
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7. HOW DO PLANTS
PREPARE THEIR FOOD?
Plants prepare their food with the help of
certain raw materials that they gather from
their surroundings:
◦ water
◦ carbon dioxide
◦ sunlight
◦ minerals
◦ chlorophyll
The process by which plants prepare their
food by using these raw materials is
called Photosynthesis. 7

8. PROCESS OF PHOTOSYNTHESIS
◦ Carbon dioxide is taken in through tiny
pores on the leaves called stomata.
◦ Water and minerals that are required
for the process are transported to the
leaves from the roots through the
stem.
◦ Chlorophyll helps the leaves use the
energy from the sunlight to prepare
food using the carbon dioxide, water
and minerals.
◦ Oxygen is released as a by-product
from this process. 8

9. ULTIMATE SOURCE OF ENERGY
FOR ALL LIVING ORGANISMS?
◦ We know that the plants use solar energy to make their
food.
◦ The herbivores animals depend upon the plants for their
food. Animals (carnivores) that do not eat plants depend
upon the herbivores animals. Therefore, all of the living
organisms directly or indirectly receive their energy from the
Sun.
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10. HOW DO PLANTS GENERATE PROTEINS
AND FATS?
◦ Along with carbohydrates, plants can also produce proteins and fats
which are formed with the help of Nitrogen.
◦ Nitrogen is present in large amounts in the air but plants cannot
consume the nitrogen directly from the atmosphere.
◦ The soil often contains some bacteria that are capable of converting the
nitrogen into nitrates which can be the used by the plants.
◦ Also, fertilizers used by farmers and gardeners contain a high amount of
Nitrogen which mixes into the soil and is used by the plants.
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11. OTHER MODES OF NUTRITION
◦ Most of the plants have green pigment called chlorophyll
and can make their own food.
◦ Some plants do not have chlorophyll and cannot synthesize
their own food and are known as Heterotrophic plants
◦ This type of nutrition can be categorized into
1. Parasitic mode of nutrition
2. Insectivorous mode of nutrition
3. Saprophytic mode of nutrition
4. Symbiotic mode of nutrition 11

12. PARASITIC MODE
OF NUTRITION
◦ Some plants live on another
plant for their nutrition.,
these are called Parasites.
◦ The plants on which these
parasitic plants survive are
called the host.
◦ For Example, Cuscuta is a
parasitic plant.
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13. INSECTIVOROUS MODE
OF NUTRITION
◦ These plants are green and carry out
photosynthesis.
◦ But they grow in nitrogen-deficient soils.
◦ So, in order to get nitrogen, they feed on
insects.
◦ These insectivorousplants have their
parts modified for attracting and catching
insects.
◦ For example - The pitcher plant,
Venus flytrap etc. 13

14. SAPROPHYTIC MODE OF
NUTRITION ◦ Some organisms survive on decaying food and
organisms.
◦ The organisms that survive because of the saprotrophic
nutrition are called Saprophytes.
◦ The saprophytes secrete digestive juices on the decaying
and dead matter.
◦ These juices convert the matter into a solution.
◦ The saprophytes that absorb the nutrients from the
solution.
◦ For Example : Bread mould, Fungi (yeast and
mushrooms) are a saprophytes that can be found on
stale food and pickles which are exposed to the hot and
humid environment. 14

15. SYMBIOTIC MODE
OF NUTRITION
◦ Sometimes organisms live together
to share shelter and food with each
other. These are said to have a
symbiotic relationship.
◦ Example - Fungi live in the roots of
the trees. These fungi take food
from the trees and in return help the
trees in absorbing water and
nutrients from the soil.
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16. REPLENISHING THE SOIL WITH NUTRIENTS
◦ Plants get their nutrients from the soil mainly hence there is
a need to replenish the soil again with nutrients so that the
plants can survive on it.
◦ Fertilizers and manure are often used to replenish the soil
with the nutrients. They contain potassium, phosphorus and
nitrogen all of which are important for the plants.
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17. ◦ A bacterium called
Rhizobium is present in the
soil which can convert nitrogen
present in it in the form that
can be consumed by the plants.
◦ The Rhizobium generally lives
in the roots of the plants such
as peas, beans, grams and
legumes and provides nitrogen
to these plants. This is also an
example of a symbiotic
relationship. The farmers often
do not need to use fertilizers
while growing such crops.
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18. THANK YOU
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