Nutrients are chemicals in food that are necessary for organisms. Plants get nutrients through photosynthesis using carbon dioxide, water, sunlight, and minerals to produce carbohydrates and oxygen. Nutrition refers to how organisms take in and use food. Plants are autotrophic and make their own food through photosynthesis while fungi are saprotrophic and feed on dead and decaying matter. Some plants like pitcher plants are insectivorous and feed on insects to fulfill their nitrogen needs. Parasitic plants feed on other organisms called hosts. Symbiotic relationships benefit both organisms such as lichens where algae provides food and fungi provides shelter.

1. Mount Carmel School,
Zirakpur
Grade: 7
Subject: Science
Topic: Nutrition in Plants (Recap)

2.  Nutrients - chemicals or components
present in food that are necessary for our
body.
Nutrients
Energy giving
Carbohyd
rates
Fats
Body Building
Proteins
Protective foods
Vitamins Minerals

3.  Nutrition - the method of taking in food
and its utilization by an organism.
Nutrition
Heterotrophic
Saprophytic
(Fungi)
Insectivorous
Plants (Pitcher
Plant)
Parasitic
(Cuscuta)
Humans,
Animals,
birds,
Autotrophic
Green plants

4. PHOTOSYNTHESIS - the process of making food
(carbohydrates) using the raw materials
to release oxygen. This is a type of natural
chemical process and can be represented as:
Carbon dioxide + water sunlight carbohydrate+oxygen
Raw materials End Products
Raw Materials:
1. Sunlight – trapped by Chlorophyll
2. CO2 – taken in through Stomata
3. Water – absorbed by roots and transported
through thin pipes in stem
4. Minerals – absorbed by roots along with water

5. Leaf
Stomata

6. SAPROTROPHS: are non – green
organisms that feed on the dead and
decaying matter. They produce digestive
juices and convert the food into solution
and then suck the nutrition. For. Example
fungi, Mushroom is also a type of fungi.
The mode of nutrition is Saprotrophic
nutrition.
The fungus grows in moist places. It grows
from spores. Spores are generally present
in the air and grow when they land on wet
and warm things. The picture
Shows a bread mold.

7.  Parasitic nutrition:
 When an organism draws out nutrition
from the body of some other organism is
called parasitic nutrition. The organism is
known as a Parasite and the organism
from which a parasite draws its nutrition
is known as a HOST.

8.  Insectivorous plants:
 Pitcher plant: although green (contains
chlorophyll) still feeds in insects as it
grows on nitrogen deficient soil. To fulfill
the deficiency of nitrogen it feeds on
insects.


9. SUNDEW VENUS FLY TRAP
COBRA LILY RAFFLESIA

10.  SYMBIOTIC RELATIONSHIP – A type of
relationship of two organisms where both
of the organisms are benefitted. They
both help each other in development.
 Lichens are symbiotic associations of
algae and fungi. The algae being
photosynthetic prepares food for the fungi
and fungi in return gives shelter to algae.

11.  Rhizobium and the root nodules of
leguminous plants:
 The bacterium Rhizobium fixes nitrogen
for the plants into the soil i.e it converts
the insoluble atmospheric nitrogen into
soluble nitrates and nitrites which can be
easily absorbed by the plants. In return
the plants provide shelter and food to the
bacterium.
ROOT NODULES

12.  JUST FOR FUN: you might have seen
birds sitting on the backs of grazing
animals. This is also an example of
symbiosis.
 The birds help the animal to get rid of the
ticks on their bodies.
 The cow or buffalo gets rid of the insects.
 The birds get food and a free ride.