Skip to main content

What is photosynthesis?

 

Why do plants and animals need to grow?

Almost all plants and animals need air, water, light, and nutrition to grow. Green plants use a complicated chemical process, called photosynthesis, to create energy for survival and growth. Since plants create their own energy, they are the first link in the food chain. Animals need to drink water and eat plants or other animals to get energy. Therefore, they are present at the nest step in the food chain.

There are some animals, like camels, that can survive for days without drinking water. Since they live in deserts with very little water, they have adapted to the special conditions of their habitat.

 





How do plants get food?

Unlike animals, plants produce their own food and except for a few carnivorous plants, do not eat other organisms. Green plants use water, nutrients, and a green matter in their leaves called ‘chlorophyll’ to produce their food. Normally water and nutrients are absorbed from the ground through their roots.

Some plants, however, have developed other methods for obtaining water and nutrients. Many tree-dwelling plants make funnel-shaped ‘containers’ with their leaves to catch water. Carnivorous plants use their digestive juices to convert the insects, caught in their folding or sticky traps, into nutrients.

 


What is photosynthesis?

The chloroplast inside green leaves of plants is the ‘workshop’ where photosynthesis takes place. Water (H2O) is supplied to the leaves by the roots, and Carbon dioxide (CO2) is absorbed from the air through tiny pores on the lower side of the leaf. Both these are broken down into elements, hydrogen (H), carbon (C) and oxygen (O) with the help of chlorophyll and sunlight. Plants build ‘glucose’ (grape sugar) from these elements and oxygen is released in the atmosphere as a by-product.

Photosynthesis has been the source of oxygen in air since the origin of life on Earth.

 


What happens when we keep Plants in dark?

IN a nutshell, where there is no light, plants shed their leaves and die, Leaving only their roots and stems. Plants grow lowly at night and in winters. Most animals are also dependent on light, although some have adapted to their dark habitats. For example, the moles living below the ground are almost blind because they do not need their eyes underground.

We humans also need sunlight to help produce Vitamin D in our skin, which in turn is needed for building bones. We will also lose the perception of time if it is pitch dark around us for very long.

 

What is food chain?

In nature, there are ‘producers’ that build biological mass, and ‘consumers’ that eat. Plants are the producers, which grow and create energy with the help of photosynthesis. They are then eaten by a consumer, and that consumer is often eaten by another consumer.  This chain of consumers is called the ‘food chain’.

A short food chain is grass-sheep-man. A longer one is algae-water flea-herring-seal-polar bear: a water flea eats alga, a herring eats many water fleas, a seal eats herrings and the polar bear eats the seal. Ultimately a lot of algae are needed to feed a polar bear.

When the polar bear dies its meat is either eaten by other animals or is decomposed into nutrients by bacteria. These nutrients are again used by the algae to create energy, and thus the food chain gets completed.

 

 How do Camels survive long voyages in the desert?

Camels can survive up to 2 weeks without drinking water because they can store about 150 liters of water in their bodies. Fat is also stored in their humps and this storage of energy can sustain them for about 30 days without food.

Furthermore, unlike most other mammals, camels can change their body temperature. At night they lower their body temperature considerably so that during the day the body warms slowly and they do not sweat much. Consequently there is no loss of fluids early in the day.

 

 

 

 

 

Comments

Post a comment

Popular posts from this blog

Is Our Brain Bigger Than That of the Dinosaurs?

  What Differentiates Humans from Animals Biologists classify humans as animals and part of the animal kingdom. Like our nearest relatives, the apes, humans are also mammals. Humans have evolved from apes, but there are features that differentiate us from other animals- including apes. These include the upright walk, our opposable thumb, our special ability to communicate by a language, and our highly developed brain. Our brain allowed our ancestors, like the Neanderthals , to invent tools.   Did humans evolve from apes? Today, one can think of humans and apes as cousins. They have common ancestors, but have not descended directly from each other. About 5-7 million years ago, a line of man-like apes grew apart, and evolved independently of the other apes. The oldest, almost completely intact skeleton of an upright ancestor of human- the Australopithecus - was found in 1974 in Ethiopia (Africa). The scientists named it ‘ Lucy’ .   Do animals use tools? Animals do make use o

WHAT IS A BABY FLAP?

  Do all children have families? Earlier, most people lived in joint families. Children who had lost their parents stayed with their relative as part of their family. In today’s lifestyle, when there are fewer joint families, it is difficult for orphaned children to become part of a family. That is why there are orphanages to take care of these children, and some lucky ones are adopted and hence they find a new home. In a family the children are protected and given emotional and financial support. Apart from having a family, it is also important to have friends.     Why some parents are married and others are are not? Many couples prefer to get married, and then have children. Others do not marry, and live happily together with their children. In some cases, the parents get divorced and live separately. The children then live with one of the parents. If the parent finds a new partner, who may also have children, they often make a new family together.   What is a joint famil

How do we discover what is inside the Earth?

What is the external structure of Earth? It has been known for more than 2000 years that the Earth is round, but we were able to actually see this much later only when we flew into space. The knowledge why we do not fall off from Earth is much more recent. A journey as describes by author Jules Verne in his book Journey to the center of the earth was, after all, impossible. Only one thing was known: The earth is made up of soil, rocks and water. Today, we know that the Earth is also surrounded by an air cover called the atmosphere.   What is the internal structure of earth? Like an onion, the Earth has several layers. The outermost layer, the Earth’s crust, has an average depth of about 40km. As compared to the diameter of Earth, which is around 12,700 km, the crust is very small. It is primarily made up of solid rocks. Below the crust is the solid mantle, reaching to a depth of about 2900 km. due to the heat inside the Earth, the mental consists of solid and molten rocks. Belo