Question

Explain the events of photosynthesis
Explain two types of autotrophic nutrition with example.
Explain the characteristics of life.
Write the word equation of photosynthesis.
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Answer 1

Answer:

*1. Photosynthesis is a process by which phototrophs convert light energy into chemical energy, which is later is used to fuel cellular activities. The chemical energy is stored in the form of sugars, which are created from water and carbon dioxide.

*2. Autotrophic nutrition is a process in which the organism produces their food from the simple inorganic materials such as water, carbon dioxide and mineral salts in the presence of sunlight. ... Plants such as blue-green algae and cyanobacteria could be considered as some examples of autotrophic nutrition.

*3. The characteristics of living organisms are:

(i) Growth and development- Young organisms (plants and animals) grow and develop into adults.

(ii) Movement- Animals exhibit a wide range of movements.

(iii) Reproduction- The biological process by which new organisms (offsprings) are produced from organisms of the same kind.

(iv) Respiration- Oxygen is used for the oxidation of food and carbon dioxide is produced.

(v) Responsiveness- All living organisms respond to light, heat and the changes around them.

(vi) Excretion- The process by which metabolic wastes and other non-useful, toxic wastes such as faeces are eliminated from an organism is called excretion. Plants also remove their wastes.

(vii) Adaptation- Changes in the structure or behaviour of an organism that allow it to survive in a particular habitat are called adaptations.

*4. 6CO2 + 6H20 + (energy) → C6H12O6 + 6O2 Carbon dioxide + water + energy from light produces glucose and oxygen.

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