VII C Science Chapter -1 Nutrition in plants

DATE: 22/4/2021

GRADE: 7 C

CHAPTER: NUTRITION IN PLANTS

Modes of Nutrition
On the basis of a different mode of nutrition, organisms are categorised into two major types, i.e.

(i) Autotrophs (auto-self, trobpos-nourishment) Autotrophic nutrition is the mode of nutrition in which organisms make their own food from the simple substance (e.g. CO2 and H2O) by the process of photosynthesis. Therefore, plants are called autotrophs.

(ii) Heterotrophs (heteros-other) Humans and animals do not contain chlorophyll and are dependent on plants for their food in readymade form. Those organisms which cannot prepare their own food and take food from green plants or animals are called heterotrophs and the mode of nutrition isOther Modes of Nutrition in Plants

There are some plants which do not contain chlorophyll in them and thus, cannot prepare their own food. These plants obtain their food from other plants or animal, i.e. they are heterotrophic in nature

Parasitic Plant

A parasitic plant is one that lines inside or outside the other organism and derive their food from them. The plant (non-green) which obtains their food from other organism is called a parasite and the living organism from whose body, food is obtained is called host, e.g. amarbel or Cuscuta. It takes readymade food from host through special type of roots called sucking roots which penetrate into host plant and suck food material from the host

Insectivorous Plant

There are some plants which can trap insects and digest them for their nutrition. These plants are green in colour but lack nitrogen elements. To overcome this problem, these plants eat insects. Hence they are called insectivorous plant or carnivorous plants. These have specialised leaves, the apex of which forms a lid that can open and close the mouth of pitcher. There are hair inside the pitcher which are used to entangle the insects

When an insect comes in contact of the lid, it gets closed and traps the insects. The insect inside the pitcher is digested by digestive juices secreted by the pitcher to obtain nitrogen compounds (amino acids) from them

e.g. pitcher plant, sundew, Venus flytrap and bladderwort

Since these can synthesise their own food but fulfil their nitrogen deficiency by eating insects, therefore these are called as partial heterotrops

Homework

Why insectivorous plants feed on insects?

What is autotrophic nutrition?

DATE: 23/4/2021

GRADE: 7 C

CHAPTER: NUTRITION IN PLANTS

TOPICS TAUGHT: 

PLANT SOIL INTERACTION

ART INTEGRATION ACTIVITY (TO BE DONE IN SCRAPBOOK/IF SCRAPBOOK NOT AVAILABLE,CAN BE DONE IN SCIENCE NOTEBOOK)

ACTIVITY 1- Integration with Art: Chlorophyll painting 

Chlorophyll, the green pigment found in a plant’s leaves, is a key ingredient in the process of photosynthesis. It also makes great paint! Material required (to be sourced by the students): 8-10 leaves , a white sheet of paper, a metal spoon. 

Draw the outline of the bark of a tree as shown in the image below.

· Press firmly on the leaves with a metal spoon to extract the pigment and use it to colour the leaves of the tree. Avoid plastic spoons as they break when pressed as firmly as necessary. 

· The student can also ball up few leaves and use them as paintbrush to colour the leaves of the tree. 

· PLEASE SEND EMAIL OF THE ACTIVITY ON sunayana.sonawane@podar.org

ACTIVITY 2 (TO BE DONE IN SCRAPBOOK)

TO find another example of a symbiotic relationship. Create a ‘WANTED’ poster. This might be a parasite looking for a new host, or an organism in a mutualism relationship looking for another organism to participate. Posters should be based on factual information and real symbiotic relationships.

NOTE: SUBMIT THE ACTIVITY TILL 

sunayana.sonawane@podar.org

HOMEWORK: REVISE THE TOPICS TAUGHT

DATE: 27/4/2021

GRADE: 7 C

CHAPTER: NUTRITION IN PLANTS

TOPICS TAUGHT:  

DISCUSSION OF NOTEBOOK ,WORKBOOK EXERCISE

HOMEWORK: REVISE THE TOPICS TAUGHT.. ACHIEVEMENT TEST OF CH 1 ON 28/4/2021

DATE: 28/4/2021

GRADE: 7 C

CHAPTER: NUTRITION IN PLANTS

TOPICS TAUGHT:  

ACHIEVEMENT TEST- GOOGLE FORM- NUTRITION IN PLANTS Revision

HOMEWORK: COMPLETE THE WRITTEN WORK AND SEND TILL 30/4/2021