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Question
The number of heterotrophs found in desert regions is smaller. However, they are found in greater numbers in the sea. Why is this so?
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Solution
The conditions in deserts are extremely difficult for survival of organisms. Not all kinds of organisms can survive in such harsh climatic conditions, which means there are only few types of organisms which would be found in this region. Since, there are not many kinds of plants and animals which are found in this region, heterotrophs would not be able to survive and would die of starvation. That is why less heterotrophs are found in desert areas. However, in case of a habitat like sea, there are plenty of organisms which are found in the region ranging from aquatic plants, to small fishes to big fishes. It is an environment which supports the survival of heterotrophs, and thus more heterotrophs are found in this region.
RELATED QUESTIONS
All the animals can be divided into three groups on the basis of their eating habits. Name the three groups.
What is the scientific name of the animals which is only meat eaters?
What is the scientific name of the animals which is only plant eaters?
Fill in the following blank with suitable word :
Heterotrophs depend on .................... and other .................... for food.
What are heterotrophs? Give one example of heterotrophs.
What are herbivores, carnivores and omnivores? Give two examples of each.
The correct order of steps occurring in nutrition in animals is:
(a) Ingestion → Absorption → Digestion → Assimilation → Egestion
(b) Ingestion → Digestion → Assimilation → Absorption → Egestion
(c) Ingestion → Digestion → Absorption → Assimilation → Egestion
(d) Ingestion → Assimilation → Digestion → Absorption → Egestion
A unicellular animal P having no fixed shape ingests a food particle by forming temporary finger-like projections Q. The food particle is engulfed with a little surrounding water to form a temporary stomach R inside it. The chemicals S from surrounding cytoplasm enter into R and break down food into small and soluble molecules by chemical reactions. The digested food is absorbed directly into cytoplasm by the process T. The undigested food is thrown out of the body by the rupture of a cell organelle U in a process called V.
(a) Name the unicellular animal P.
(b) What are (i) Q, and (ii) R?
(c) Name (i) chemical S, and (ii) process T.
(d) Name (i) organelle U, and (ii) process V.
Select the correct statement
Generally, food is broken and absorbed within the body of organisms. In which of the following organisms is it done outside the body?
