Science Class 7 Online Classes, CBSE Worksheets

ANSWERS THE FOLLOWING QUESTIONS, SOLVE IT IN NOTEBOOK, YOU CAN TAKE THE HELP OF OLD AND NEW BOOKS( IF YOU HAVE).

What is symbiosis relationship?
How are saprophytes, parasites & symbionts different from each other?
How are water and minerals transported to the plant?
What are parasitic plants? Explain with an example?
How do leaves help a plant make its food?
What are the different types of heterotrophic nutrition in plants? Give two examples of each?

FILL IN THE BLANKS

Chlorophyll containing structure in a plant cell _______
Chlorophyll helps the plant to _______
An organism that obtains nutrients from decaying organic matter is called _______
Light energy is converted into chemical energy during the process of _______
The food synthesized by the plant is stored as_______
The food factories of the autotrophic plants are their _______
Mistletoe is an example of _______
Most plants and unicellular algae are _______
Insectivorous plants are _______
During photosynthesis the stomata helps in the intake of _______
The pipe like structures that transport the food in plants are called _______
Rhizobium bacteria that live in roots of certain plants _______
Carbon dioxide is absorbed by the plant through an opening called _______
The water taken up into the leaves make the guard cells _______
Organisms that make their own food are called _______

Answers of fill up are

Differentiate between absorption and assimilation?
How does tooth decay take place?
What are the functions of tongue?
What is the role of epiglottis?
Write short notes on the roles of the following organs in nutrition in humans.
a. Oesophagus. b.Liver. c. Large intestine

https://www.youtube.com/watch?v=BK-dYULd2kw&feature=youtu.be

Answers the following questions:–

Define the following: (a) Crown, (b) Understoreys and (c) Canopy.
Name the process by which plants release oxygen.
Name any two forest products.
Explain the importance of forest.
What is the interrelationship between plants, soil and decomposers?
Discuss the role of forest in maintaining the balance between oxygen and carbon dioxide in the atmosphere.

Fill in the blanks:–

Forest provides a ______________ for many animals and plants.
The decaying animal _______________ provides nutrients to the seedling in the forest to grow.
A forest is a purifier of __________ and ____________ water.
Forest also acts as natural__________________ of rain water.
Forest is dynamic living__________.

Answers the following questions:–

What is meant by deforestation?
Explain the reasons behind deforestation.
List the various impacts of deforestation.
Whai is soil erosion? What are its cause and how it is prevented?
If there were fewer trees, how will the water cycle be affected?
Explain why there would be the chances of increase in carbon dioxide with the decrease in number of forests?
True/False
1. Forests protect the soil from erosion.
2. Plants and animals in a forest are not dependent on one another.
3. Forests influence the climate and water cycle.
4. Soil helps forests to grow and regenerate.
Fill in the blanks:–
1. ____________________ is a system comprising various plants, animals and micro-organisms.
2. In a forest, ___________________ forms the uppermost layer followed by shrubs.
3. Forests are the______________________ for the forest dwelling communities.
4. ________________________convert the dead plants and animals to humus.
5. Forest serve as__________________________ and water purifying system in nature.