Important notes - science - class 7 - chapter 1 - Nutrition in Plants

1. Difference between Autotrophic nutrition and Heterotrophic nutrition?

 Autotrophic nutrition

• It is a mode of nutrients which autotrophy take in simple inorganic substances like carbon-dioxide and water from outside.
• Carbon and energy requirements are fulfilled by photosynthesis.
• This nutrition's is seen in the green organisms which have chlorophyll.  

Heterotrophic nutrition 

• It is the mode of nutrition in which heterotrophs take in complex material prepares by autotrophs.
• Heterotrophs depends directly or indirectly depend on autotrophs.
• This nutrition occurs in non green organism which do not have chlorophyll. 

2. write a short note on stomata?

• The tiny pores present on the surface of the leaves are called stomata. Theses pores are surrounded by guard cells.
• The guard cells are kidney shaped and are located on either side of the stomata.
• The guard cells regulate the opening and closing of stomata.
• Guard cells have chloroplasts.

3. Role of stomata in plants?

• Exchange of gases takes place in the leaf through stomata during photosynthesis carbon-dioxide is taken in and oxygen is given out.
• Stomata helps in breathing (in plants) oxygen enters in and carbon-dioxide exits.
• Excess of water escapes as water vapor through stomata. Transpiration helps in clotting the plant.  

4. Difference between saprotrophs and parasite.

Saprotrophs

• The organisms which drive the nutrition by decomposing and observing dead organic matter, they have enzymes which have secreted on dead organic matter like wood and leather.
• Ex- Mushroom and Bactria.

Parasite

• The organizms which depend on other organism and derived all the host organism as they cannot synthesis their own food are called parasite.
• Ex- Cuscuta,dodder.

 5.Write a short note on cell?

• Cell is a single organism.
• It can only be seen under the microscope.
• It is enclosed by a thin outer boundary called the cell membrane.
• The cell had a distinct centrally located spherical structure called nucleus.
• The nucleus is surrounded by a jelly like substance called cytoplas.

6. Write about photosynthesis?

• Photo means light and synthesis means combine.
• The energy used to synthesis from carbon-dioxide and water is obtained in this process.
• The synthesis of food takes place in the presence of sunlight.
• Chlorophyll,sunlight,carbon-dioxide and water are necessary to carry out the process of photosynthesis.
• The survival of all living things directly depends on the food made by the plant.
• During the process of photosynthesis oxygen is released and carbohydrate get converted into starch.