SOLUTIONS OF REVISION TEST ( Class 7, CHAPTER 1)
Q1.
1. cells 1 marks
2. chlorophyll 1 marks
3. sun 1 marks
4. algae 1 marks
5. proteins 1 marks
6. carbon, hydrogen and oxygen 1/3 marks
7. saprotrophic nutrition 1 marks
8. lichen 1 marks
9. Rhizobium 1 marks
10. Chlorophyll and sunlight 1/2 marks
Q2:
a. Pitcher plant ( Heterotrophic mode of nutrition , Insectivorous Plant) 1/2+1/2 marks
b. Amarbel or Cuscuta ( Heterotrophic mode of nutrition, parasitic plant) 1/2+1/2 marks
c. Bread fungus ( Saprophytic or Saprotrophic mode of nutrition) 1/2+1/2 marks
d. A green plant i.e. Aloe Vera ( Autotrophic Mode of Nutrition) 1/2+1/2 marks
e. Lichen (Symbiotic Association) 1/2+1/2 marks
Q3. The mode of nutrition in which organisms make food themselves from simple substances is called autotrophic autotrophic nutrition. Therefore, plants are called autotrophs. 1 marks
Animals and most other organisms take in ready made food prepared by the plants. They are called heterotrophs. This mode of nutrition is called heterorophic nutrition. 1marks
Q4. During photosynthesis, chlorophyll containing cells of leaves , in the presence of sunlight, use carbon dioxide and water to synthesise carbohydrates. The process can be represented as an equation:
carbon dioxide +water → carbohydrate + oxygen
During the process oxygen is released. The carbohydrates ultimately get converted into starch. The presence of starch in leaves indicates the occurrence of photosynthesis. The starch is also a carbohydrate. ( 1mark for written portion, 1 for reaction and one for diagram)
During the process oxygen is released. The carbohydrates ultimately get converted into starch. The presence of starch in leaves indicates the occurrence of photosynthesis. The starch is also a carbohydrate.
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