Science MCQ (1 Marks)

We see slimy, green patches in ponds or in other stagnant water bodies. These are generally formed by the growth of organisms called “algae”. They contain chlorophyll. Algae can also prepare their own food by photosynthesis, so they are known as “Autotrophs”. We have also seen fluffy patches of white, green, brown color growing on rotting wood during the rainy season. These organisms are called “fungi”. They take in nutrients in solution form from dead and decaying matter, called “Saprotrophs”.

In soil, the Rhizobium live freely and feed on dead and decaying matter. However, they also form symbiotic association with the roots of legumes like pea plant.

Yes, because the chlorophyll needed for photosynthesis is hiding within the leaf colour. Plant leaves contain chlorophyll as “Carotenoids” and “Anthocyanins”. These assist chlorophyll in the process of photosynthesis.

Venus Fly trap.

A saprophyte or saprotroph is an organism that gets its nutrition and energy from dead and decaying organic matter. These may be decaying parts of plants or animals. This means that saprophytes are heterotrophs. They are consumers in the food chain. This is a phenomenon observed in Fungi.

Autotrophs.

Parasite.

Carbon dioxide is not required for photosynthesis.

The pores through which leaves exchange gases is Stomata. They are the small openings present on the inner surface of the leaves. Stomata can be opened and closed. During night when no photosynthesis take place the plant breathe in oxygen and breathe out carbon dioxide through stomata.

Carbon dioxide is the gas used from the atmosphere during photosynthesis.

Respiration.

Chloroplast

Pitcher plant

Chlorophyll is the green pigment present in leaves of plants that absorbs sunlight energy, to carry out photosynthesis. In the absence of chlorophyll, the leaves would not be able to capture sunlight energy. Therefore, no photosynthesis can occur.

Fungi are saprotrophs. Saprophytes are the organisms which grow and depend on dead and decaying matter.

Lichens.

Insectivorous plant.

Grows in soils which lack in nitrogen.

Carbohydrate and oxygen are product of photosynthesis.

Chemical energy

Mushroom.

Symbiosis.

Nutrition

All of these

Pitcher is insectivorous plant.

All of these

Photosynthesis is the process by which green plants prepare their own food.

Chlorophyll makes plants green. Chlorophyll is located in a plant’s chloroplasts, which are tiny structures in a plant’s cells. It is basically a group of green pigments used by organisms that convert sunlight into energy via photosynthesis. Without this energy, plants would be unable to initiate the process of photosynthesis, which converts water and carbon dioxide into starches that plants can use for food.

Starch.

Leaves

Parasites live on other living beings.

A greenhouse is built of any material through which light can pass, such as glass or plastic. Farmers get many advantages like the crops grow well.

Chlorophyll, sunlight, carbon dioxide and water are necessary to carry out the process of photosynthesis. During the process oxygen is released. The carbohydrates ultimately get converted into starch. The presence of starch in leaves indicates the occurrence of photosynthesis. The starch is also a carbohydrate.