Nutrition in Plants Class 7 Extra Questions and Answers Science Chapter 1

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Class 7 Science Chapter 1 Extra Questions and Answers Nutrition in Plants

Extra Questions for Class 7 Science Chapter 1 Nutrition in Plants with Answers

Nutrition in Plants Class 7 Extra Questions Very Short Answer Type

Question 1.
Name the things necessary for photosynthesis.
Answer:
Carbon dibxide, water, chlorophyll, sunlight.

Question 2.
Which is the ultimate source of energy?
Answer:
The sun.

Question 3.
What is the function of chlorophyll?
Answer:
It helps leaves to capture the energy of the sunlight.

Question 4.
Is there any organ other than leaves where photosynthesis takes place?
Answer:
Yes. Photosynthesis takes place in all green parts of the plant be it stem or branches, e.g., cactus.

Question 5.
What are algae?
Answer:
Algae are microorganisms. They are found as slimy, green patches in ponds or in other stagnant water bodies.

Question 6.
Which bacteria can convert nitrogen into soluble form?
Answer:
Rhizobium.

Question 7.
Name two leguminous plants.
Answer:
Pea, gram.

Nutrition in Plants Class 7 Extra Questions Short Answer Type 1

Question 1.
Why are plants called autotrophs?
Answer:
Auto means self and trophos means nourishment. So, autotrophs means organisms that can make nutrients for themselves. Plants are such organism so, they are called autotrophs.

Question 2.
What do you mean by heterotrophs?
Answer:
Heteros means other; trophos mean nourishment. So, heterotrophs mepns organisms that depend on others for their nutrition. Animals including man are such organisms.

Question 3.
How is Sun the ultimate source of energy for all the living beings?
Answer:
Green plants prepare food utilising sunlight. All other organisms depend on green plants directly or indirectly for their nutrition. So, Sun is the ultimate source of energy.

Question 4.
How do fungi derive nutrition?
Answer:
Fungi secrete digestive juices on the dead and decaying matter and convert it into a solution. Then they absorb the nutrients from it.

Nutrition in Plants Class 7 Extra Questions Short Answer Type 2

Question 1.
What are stomata? Draw diagram.
Answer:
The small pores present on the surface of the leaves are called stomata. They are surrounded by ‘guard cells’. They help in taking carbon dioxide and releasing during photosynthesis.

Question 2.
What do you mean by symbiotic relationship?
Answer:
Some organisms live together and share shelter and nutrients. This is called symbiotic relationship. For example, certain fungi live in the roots of trees. The tree provides nutrients to the fungus and, in return, receives help from it to take up water and nutrients from the soil.

Question 3.
What are saprotrophs?
Answer:
The mode of nutrition in which organisms take in nutrients in solution form from dead and decaying matter is called saprotrophic nutrition. Plants which use saprotrophic mode of nutrition are called saprotrophs.

Nutrition in Plants Class 7 Extra Questions Long Answer Type

Question 1.
What do you know about cell?
Answer:
Just like buildings are made of bricks, the bodies of living organisms are made of tiny units called cells. A cell can be Jefined as the structural and functional unit of the living organisms. Cells can be seen under the microscope. Some organisms are made of only one cell.

The cell is enclosed by a thin outer boundary, called the cell membrane, Most cells have a distinct, centrally located spherical structure called the nucleus. The nucleus is surrounded by a jelly-like substance called cytoplasm.

Question 2.
If the pitcher plant is green and carries out photosynthesis, then why and how does it feed on insects?
Answer:
The pitcher plant is green and carries out photosynthesis. Thus, it gets its nutrition by this process. But it does not get nitrogen which is required for its growth from the soil in which it grows.

The pitcher plant have pitcher like structures which are the modified parts of the leaves. The apex of the leaf forms a lid which can open and close the mouth of the pitcher. Inside the pitcher are hair which are directed downwards. When an insect lands in the pitcher, the lid closes and the trapped insect gets entangled ir to the hair. The insect is digested by the* digestive juices secreted in the pitcher.

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