Nutrition – Experiment, in Animals, in Amoeba, Life Process, types, holozoic & More

Nutrition - Experiment, in Animals, in Amoeba, Life Process, types, holozoic & More
Nutrition - Experiment, in Animals, in Amoeba, Life Process, types, holozoic & More

⦁ What is life process?

Activities like respiration, nutrition, growth, movement, response to stimuli, excretion and reproduction is called as life process.

⦁ What is nutrition?

The process by which organisms obtain and utilize food is called as nutrition.

⦁ What are the types of nutrition?

There are two types of nutrition:
*Autotrophic nutrition
*Heterotrophic nutrition.

What are autotrophs?


The organisms who prepare their own food is called as autotrophs.
Example: all green plants.
⦁ What is autotrophic nutrition?
Green plants prepare their food by a process called photosynthesis.This mode of nutrition is called autotrophic nutrition.

EXPERIMENT : to show that carbon dioxide is necessary for photosynthesis.

⦁ Take two potted plants which are kept in a dark room for two days .
⦁ Mark one of pot as ‘A’ another pot as ‘B’.
⦁ Place a beaker containing potassium hydroxide solution near the plant ‘A’ and a beaker containing sodium bicarbonate solution near plant ‘B’.
⦁ Cover both the pots separately by bell jars or polythene bags.
⦁ Take precautions such that air does not enter the polythene bags.
⦁ Place both plants side by side in a well lit room for about 48 hours.
⦁ We can see that the leave of plant have starch.
⦁ Therefore we conclude that carbon dioxide is required for plants to prepare their own food in the form of starch.

⦁ What is stomata?

The minute openings are called stomata.
Carbon dioxide enters the plant body through stomata.

⦁ What is grana and stroma?

Grana and Stroma are the major regions of chloroplast.

⦁ What is light reaction?

Grana and stroma are involved in two different phases of photosynthesis called light dependent reaction which is also called light reaction.

⦁ What is dark reaction also called?

Dark reaction also called as light independent reaction.

⦁ Explain light dependent reaction.
  • Light dependent reaction takes place in the present of sunlight, in the grana region.
  • During this reaction water is decomposed into hydroxyl(OH-) and hydrogen (H+)ions in the presence of light energy.
  • Oxygen is given out by plants in this phase
  • Light energy is converted in to chemical energy and is stored in the form of ATP.
⦁ Explain light independent reaction.

⦁ In this reaction carbon dioxide is reduced to starch .
⦁ Utilizing the energy released during light dependent reaction.
⦁ This reaction takes place in the stroma region.

What are insectivorous plants?

The group of plants try to obtain nitrogen by other means , by trapping and digesting insects, such types of plants are called as insectivorous plants
Example: Drosera, Nepethes.

What is epiphytes?


The types of plants which grow with the support of the tree, such types of growing plants are known as epiphytes.
Example: Orchids.

⦁ What are heterotrophs?


The organisms who cannot prepare their own food are called as heterotrophs. Their mode of nutrition is called heterotrophic nutrition.

⦁ What are saprophytes?

Fungi and bacteria which feed on organic matter by decomposing the nutrient supplement, thus these fungi and bacteria iare known as saprophytes .

⦁ What is decomposition?

Decomposition is the process by which the deacay and rotten matter are transformed into simpler organic matter.

⦁ What are parasites?

Parasites are animals or plants that lives in or with another animal or plant are called parasites.
Example: tapeworms, fleas, barnacles.

Nutrition in animals


⦁ Animals are heterotrophs
⦁ Holozoic is the type of nutrition found in animals
⦁ Holozoic nutrition involves five steps.
Ingestion ——->digestion——->absorption——->assimilation—–>egestion
⦁ What is ingestion?
Animal takes in food by a process called ingestion.
⦁ What is digestion?
The food enter animal’s body ,that should be broken into simple form by the process called digestion.
⦁ What is absorption?
The digested food is absorbed and transported to cells cells and tissues through blood by the process called absorption.

⦁ What is assimilation?
Digested food is stored ,utilized in the cells by the process called assimilation.
⦁ What is egestion?
The process by which the undigested food particles are eliminated from animal body.
Nutrition in amoeba
⦁ Amoeba is a unicellular organism.
⦁ All the life activities takes place in the same cell .
⦁ It feeds on bacteria, diatoms, unicellular algae, minute protozoa, and zooplankton.
⦁ Amoeba is an omnivore.

Nutrition - Experiment, in Animals, in Amoeba, Life Process, types, holozoic & More

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