7th class lesson 1Nutrition in Plants

Science chapter 1

Nutrition in Plants

NCERT solutions and other question answer

Question 1:

 Why do organisms take food?

Answer All organisms need food to get energy for growth and  of maintenance of their body

Question 2:

 Distinguish between a parasite and a saprotroph?

Answer

 Parasite

Organisms which depend on other living organisms for their food are called Parasite

 Example cuscuta, lice etc

Saprotroph

Organisms which depend on dead and decaying matter for their food are called saprotroph.

Example Mushroom ,bacteria etc

Question 3

How would you test the presence of starch in the leaves?

Answer

Take two potted plants, keep one plant in dark and other in sun light for 3-4 days. Take 1-I leaf from both the plants. Put 2-3 drops of iodine solution on both the leaves. The colour of leaf kept in dark does not change but the colour of leaf kept in sunlight changes into blue-black colour. This colour chang shows the presence of starch in leaves

Question 4

Give a brief description of the proces of synthesis of food in green plant

Answer

Plants in  the presence of sunlight. and chlorophyll use carbon dioxide and water to make their food. This proces is called photosynthesis. It can be represented by an equation

carbondioxide + water +Sunlight---------- Carbohydrates+Chlorophyll +oxygen

Questions 5

Show that plants the ultimate soure of food?

Answer

Plants(Grass)←Herbivores(Cow/goat)←Carnivores (Lion, Tiger)

Question 6: 

Why do farmers grows many fruits and vegetable crop inside large green houses? What are the advantages of the farmers?

Answer

Farmers grow many fruits and vegetables crops inside large green houses because green houses protect the plants from climatic condition (like floods) and give suitable temperature for growth of plants.

Advantages

The farmers are able to grow several times more products

Their crops are protected from birds and animals

Short question answer

Question 1:

What are stomata?

Answer

Tiny pores present on the leaf through which plants absorb carbon dioxide from the air-

Questions 2: write down the chemical equation of photosynthesis in plants.

Answer

Carbon Dioxide + water +sunlight+chlorophyll--- glucose + oxygen 

Question 3: why are plants called producers?

Answer

 Green plants are called producers because the food prepared by plants is eaten by herbivore such as goat and deer.

Question 9. What are the constituents of carbohydrates

Answer

carbon, Hydrogen and oxygen

Short Question Answer

Question 1: what is Nutrition? Explain.

Answer  Nutrition is the process by which an organisms obtain nutrients and use them for growth, development and maintenance of its body. There are mainly two modes of Nutrition 

1.   Autotrophic

2. Heterotrophic

Question 2 What is Photosynthesis? Explain.

Answer Done in NCERT I No.4

Question 3. Differentiate between autotrophy and Hetrotroph Give two Example

Answer

Autotroph• Organisms that can make their own food in the presence of sunlight, carbon- dioxide, water and Chlorophyll are called Autotroph

For example plants, algae and some bacteria etc

Heterotroph

organisms that can not make their own food but depend on plants and animal for their food are called heterotroph

Example human beings birds ,animal etc

Question 4

Human prepare their food in kitchen. This means humans are autotrophs Do you agree why or why not

Answer

Humans pre pare their food in the kitchen but they in directly depend on plants and other animali their food so they for are not autotroph

Question 5:

Khushi went on a vacation with her family  when she came back after 10 days the piece of bread in her refrigerator had green white thread like growth on it what was it how do you think it got there

Answer :It was fungus fungus can survive in cold temperature even in refrigerator or in freezer also. Fungus due to the moisture present in the bread fungus can also grow if the refrigerator is not clean.

Extra long question answer

Question 1:

Explain the symbiotic nutrition in plants with example? 

Answer: In symbiotic nutrition two different organisms leave together and mutually benefited. They help each other for feeding, protection and reproduction. For example lichen is a mutual combination of algae and fungus. The fungus absorb water from the soil and supply to algae. IT return the algae make food and supply to the fungus. This type of Nutrition is called symbiotic nutrition.