NCERT Science Notes for Class 7 (Part 5) 1.3

Hello friends in this blog you are going to read about some other modes of nutrition in plants.

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In the previous part you read-

1. What is a cell?

2. What is the structure of a cell?

Link for the previous blog-

https://allinoneguidematerial.blogspot.com/2020/10/ncert-

science-notes-for-class-7-part-4.html

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In this blog we are going to read about-

1. Parasitic Nutrition

2.  Insectivorous plants

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1. Some plants do not have chlorophyll, so they cannot synthesize their own food. They use heterotrophic nutrition to fulfill their demand of food.

 

2. Parasites are organisms which use a heterotrophic mode of nutrition and collect food from their host; sometimes parasites are harmful for the host too.

 

3. Mosquito is also a parasite, but you will read about it later. In this chapter we will read about a parasite which feeds on the plants.

 

4. Amarbel or Cuscuta does not have chlorophyll; it takes readymade food from the plant it is climbing.

 

5. Plants which feed on insects are called insectivorous plants. It has a pitcher/jug like part which is a modified leaf.

 

6. The leaf forms a lid which opens and closes as per the requirement. Inside the mouth of the pitcher there are hairs which are directing downwards.

 

7. When an insect land the lid closes and the insect get trapped in the hair and get digested through digestive juices secreted by the plant.

 

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