Question

D. Long Answer Type Questions

1. Explain the different types of nutrients required by plants.

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2. What are saprophytic plants?

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3. Give the examples of symbiosis.

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class 7​

Answer 1

Answer:

1. The plants require two types of nutrients- macronutrients and micronutrients. Macronutrients include nitrogen, phosphorus, potassium, calcium, magnesium and sulphur.

The micronutrients include boron, chlorine, copper, iron, manganese, molybdenum, and zinc.

2. A saprophyte is a plant that does not have chlorophyll, obtaining its food from dead matter, similar to bacteria and fungi.

(Note that fungi are often called saprophytes, which is incorrect, because fungi are not plants).

3. Sea sponges and coral compete for food and marine resources. If the sea sponges have sole access to the resources, they will be successful – but the coral will die. A lack of coral negatively affects the reef, which means that sea sponges could die.

Answer 2

Answer:

They are carbon, hydrogen, nitrogen, oxygen, phosphorus, and potassium. Secondary nutrients are those usually needed in moderate amounts compared to the primary essential nutrients. The secondary nutrients are calcium, magnesium, and sulfur.

Saprophytes are organisms that can't make their own food. In order to survive, they feed on dead and decaying matter. Fungi and a few species of bacteria are saprophytes. Examples saprophyte plants include: Indian pipe.

mutualism