Fungi suddenly appeared during the rainy season because it needs a warm and humid environment for its growth.

In parasitic mode of nutrition, plants depend on other live plants or animals for their nourishment. Such plants are called as parasites and the ones on which parasites depend are called as hosts. 
The insectivorous mode of nutrition is observed in plants like pitcher plant and the Venus fly trap. They purely depend on other insects and small animals for their nutrition. Cuscuta is a parasitic plant which develops special roots called haustoria. Haustoria penetrate deep into host plant tissues and just absorb the nutrients from them.
 
The plants which exhibit saprotrophic mode of nutrition are called as saprotrophs. Saprotrophs are the plants that obtain their nutrition from dead and decaying organic matter. Saprotrophs secrete digestive juices onto dead and decaying matter to dissolve it and then absorb nutrients from it.

The plant which lives on or inside another organism and derives the food from it is called as parasite whereas the non-green plants which obtain food from dead or decaying organic matter are called saprotrophs.

Multicellular

A meal must have food items that are different because different kinds of nutrients are required for our body to function properly.

A person sitting infront of a room heater feels the heat which reaches him through conduction.

Conduction in this case involves the traveling of heat through the air. The constant collision and diffusion of air molecules facilitates the transfer of heat from the room heater to the person in front of it.

Lentil is a type of grain legume (plant that belongs to the pea family) that originates from central Asia. This is one of the oldest cultivated crops. Lentils are integral part of human diet for 8000 years already. Lentils are largely cultivated in subtropical areas and in the Northern hemisphere. They can grow on various types of soil (clay, black cotton, loamy and alluvial soil), but they don't tolerate heavy rainfall and oscillation in temperatures.

Ruminants are grass eating animals like the cow, ox, buffalo and sheep swallow the food without chewing. After feeding, they bring the food from the stomach back into the mouth and chew it leisurely. This process is called rumination and such animals are called as ruminants.

The presence of starch in leaves can be tested by Iodine test. When we remove chlorophyll from leaf by boiling it in alcohol and then put two drops of iodine solution, its colour change to blue indicates the presence of starch.

The insectivorous plants grow in soil which do not contain sufficient nitrogen mineral. These plants (e.g. pitcher plant) are green and carry out photosynthesis to obtain a part of the food required by them. But they do not get the nitrogen from the soil in which they grow. So, insectivorous or carnivorous plants feed on insects to obtain the nitrogen needed for their growth.

The food grains, pulses, fruits and vegetables, all are obtained from plants. Plants also provide us different kinds of oils for cooking food like mustard oil, sunflower oil, etc. and tea, coffee, spices and sugar. Thus, plants are the major source of food materials for human beings.

Herbivores- An organisms that feed on plants and other autotrophs. These are placed at the second trophic level. Example: Cow, giraffe etc

A food chain shows the feeding relationship between different living things in a particular environment or habitat. All living things need food to give them the energy to grow and move. A food chain shows how each living thing gets its food. It shows who is eating who. The arrow means "is eaten by".
A food chain shows the feeding relationship between different living things in a particular environment or habitat. All living things need food to give them the energy to grow and move. A food chain shows how each living thing gets its food. It shows who is eating who. The arrow means "is eaten by".

Some plants eat insects. Such plants are called insectivorous plants. They trap and digest the insects. Pitcher plant is the example of an insectivorous plant. In pitcher plant the leaf is modified to form a pitcher like structure. The bright colour of the pitcher makes it very attractive to insects. Inside the pitcher; there are several hair-like structures. These hairs direct the trapped insects downwards. When an insect sits on the pitcher of the plant, the lid closes and the insect gets trapped inside the pitcher. The insect is then digested by the enzymes secreted by the cells of the plants.

The process of making of food by green plants in the presence of sunlight and chlorophyll is known as photosynthesis. Photosynthesis is the combination of two words- Photo + Synthesis. ‘Photo’ means light and ‘Synthesis’ means to make.

Process of food making in green plants:

Green plants make their food themselves. Green leaves make food from Carbon dioxide and water in the presence of sunlight and chlorophyll.

Leaves have several tiny pore-like structures on the lower surface. Such a pore is called stomata through which leaves absorb carbon dioxide from air. Water is transported to the leaves through hair like pipelines from the roots. These pipelines are present throughout the plant, i.e. from roots to branches and leaves. These pipe-lines are known as Xylem. Xylem is a type of tissue. Chlorophyll, a green pigment, is found in green leaves. Chlorophyll absorbs sunlight and gives energy. Chloroplast is the site of photosynthesis. Carbohydrate is used as food and oxygen is emitted out to atmosphere. This whole process of making food by plants is called photosynthesis.

The reaction that takes place in the process of photosynthesis can be written as:

6CO₂ + 6H₂O → C₆H₁₂O₆ + 6O₂

Carbohydrate which is produced in the process of photosynthesis is ultimately converted into starch and stored in leaves. From leaves it is transported to different parts of a plant. Starch is a type of carbohydrate. The oxygen so produced is released into atmosphere through the stomata.

Leaves are known as the kitchen or food factories of the plants because photosynthesis takes place in leaves. Leaves look green because of the presence of chlorophyll.

Besides leaves, photosynthesis also takes place in other green parts of the plant also, such as in green stems. Chlorophyll is necessary for photosynthesis; hence photosynthesis takes place only in green plants.

The leaves of plants that grow in desert areas are modified in spine like structure or scales to reduce the loss of water in the course of transpiration. In such plants photosynthesis takes place in green stems. Stem is modified into thick spongy leaf-like structures in such plants.

Photosynthesis helps to maintain a balance between oxygen and carbon dioxide in the atmosphere as it absorbs carbon dioxide and release oxygen.

Sunlight is necessary for photosynthesis. Thus sun is the ultimate source of energy for all living organism.

Our earth is the unique planet, where photosynthesis takes place. In the absence of photosynthesis life would not be possible on earth.

Following are necessary for photosynthesis to be taken place:

• Presence of sunlight
• Presence of Chlorophyll
• Presence of Water
• Presence of carbon-dioxide