What factors must be controlled in a greenhouse to improve plant growth?

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Three factors can limit the speed of photosynthesis – light intensity, carbon dioxide concentration and temperature. Without enough light, a plant cannot photosynthesise very quickly, even if there is plenty of water and carbon dioxide. Increasing the light intensity will boost the speed of photosynthesis.

Can anything grow in a greenhouse?

You can grow virtually anything in a greenhouse , but that protected space is prime real estate — with careful variety choices, you can maximize profits and produce crops that don’t do well outside for you. Cucumbers are the second most popular greenhouse crop, followed by lettuce and salad mix .

How does a green house work?

People grow tomatoes and flowers and other plants in them. A greenhouse stays warm inside, even during winter. Sunlight shines in and warms the plants and air inside. But the heat is trapped by the glass and can’t escape.

What is the chemical in leaves that absorbs light?

During this reaction, carbon dioxide and water are converted into glucose and oxygen. The reaction requires light energy, which is absorbed by a green substance called chlorophyll. Photosynthesis takes place in leaf cells. These contain chloroplasts, which are tiny objects containing chlorophyll.

How does a plant maximize photosynthesis?

Leaves enable photosynthesis to happen. Photosynthesis is the process by which leaves absorb light and carbon dioxide to produce carbohydrate (food) for plants to grow. Leaves are adapted to perform their function eg they have a large surface area to absorb sunlight.

What mineral ions do plants need?

These are absorbed through the roots as mineral ions dissolved in the soil water. Two important mineral ions needed by plants are: nitrate – for making amino acids, which are needed to make proteins. magnesium – for making chlorophyll.

How does the intensity of light affect the rate of photosynthesis?

As light intensity increases, the rate of photosynthesis will increase as long as other factors are in adequate supply. As the rate increases, eventually another factor will come into short supply. The graph below shows the effect of low carbon dioxide concentration.

Why is sunlight necessary for photosynthesis GCSE?

Photosynthesis is a process used by plants in which energy from sunlight is used to convert carbon dioxide and water into molecules needed for growth. These molecules include sugars, enzymes and chlorophyll. Light energy is absorbed by the green chemical chlorophyll.

Why is chlorophyll needed for photosynthesis to take place?

The role of chlorophyll in photosynthesis is vital. Chlorophyll, which resides in the chloroplasts of plants, is the green pigment that is necessary in order for plants to convert carbon dioxide and water, using sunlight, into oxygen and glucose.

How can weather conditions limit population growth?

Temperature and rainfall can limit population growth. Harsh weather conditions can prevent food production and less people can be supported. Series of predictable changes that occur in a community over time. Series of changes that occur in an area where no soil or organisms exist.

Why does the rate of respiration increase during exercise?

This increases the need for both food and oxygen in the body. Breathing speeds up to get more oxygen and to get rid of more carbon dioxide. When a fit person, such as an athlete, exercises the pulse rate, breathing rate and lactic acid levels rise much less than they do in an unfit person.

How does photosynthesis affect the growth of a plant?

This process, where sugars react with oxygen to produce water and carbon dioxide, is called respiration. Although light is an important factor for maximizing photosynthesis and in turn plant growth, all other growth factors both nutritional and environmental play a process and the promotion of optimum plant growth.

Is space a limiting factor for plant populations?

Limiting factors may be physical or biological. The limiting factor also causes competition between individuals of a species population. For example, space is a limiting factor. Many predators and prey need a certain amount of space for survival: food, water, and other biological needs.

What product from photosynthesis is used to make cellulose?

Plants make their own food by photosynthesis. Carbon dioxide and water react together in the presence of light and chlorophyll to make glucose and oxygen. The glucose is converted into starch, fats and oils for storage. It is used to make cellulose for cell walls, and proteins for growth and repair.

Why does a plant need photosynthesis?

Plants make their own food by photosynthesis. Carbon dioxide and water react together in the presence of light and chlorophyll to make glucose and oxygen. The glucose is converted into starch, fats and oils for storage. It is used to make cellulose for cell walls, and proteins for growth and repair.

How do you measure the rate of photosynthesis?

Measuring photosynthesis via the production of oxygen. Oxygen can be measured by counting bubbles evolved from pondweed, or by using the Audus apparatus to measure the amount of gas evolved over a period of time.