Question

Answer the following questions with correct answers
1. Define autotrophs . (1mark)
2. What is nutrition? (1 mark)
3. Explain symbiosis and saprotrophic nutrition with examples. (5marks)
4. Give a brief description of the process of photosynthesis
of food in green plants.

Answer 1

Answer:

1. Autotrophs are the organisms that produce their food using inorganic sources. 

2. The process of taking in food and using it for growth, metabolism, and repair is called Nutrition.

3. Symbiosis Nutrition - Symbiosis nutrition is the relationship between organisms in which they share their nutrition and shelter. Example - Algae and Fungi in a lichen.

Saprotrophic Nutrition - Saprotrophic Nutrition is the mode of nutrition in which organisms feed on dead and decaying matter. Example - Fungi

4. The process of synthesis of food in green plants is called photosynthesis. This process takes place in the cells containing the green pigment chlorophyll. ... During photosynthesis, chlorophyll containing cells of leaves, in the presence of sunlight, use carbon dioxide and water to synthesise carbohydrates.

Answer 2

Answer:-

1. Autotrophs- Organisms which can make their own food by using Carbon dioxide and water in the presence of chlorophyll and sunlight.

2. Nutrition- The process of taking in food and using it for growth, metabolism, and repair.

3. Symbiosis: is the combination of two Greek words 'Sym' means 'with' and 'biosis' means 'living', which means living together. In symbiosis or mutualism two different types of organisms live and work together for their mutual benefit from each other. They share shelter and nutrients, e.g. Lichens.

Saprophytic: The mode of nutrition in which organisms feed on dead and decaying matter. Example fungi. In saprotrophic mode of nutrition, the vital nutrients required for their body are collected from dead and decaying matter. The other organisms which are saprotrophic is Rhizopus, Yeast, and Mushroom.

4. We all know that plants are the primary source of food for all the life forms o the earth. Plants make food by themselves and we all are dependent on plants for food. The process of preparation of food in plants is called as photosynthesis.