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Class 6 Science Chapter 1 Important Question Answers - Nutrition in Plants

Q 1. Define
(a) Parasites

Ans: The organisms that depend on other living organisms for food are called parasites.
Examples: Cuscuta, tapeworm, liver fluke, etc. There are two types of parasites: 

  1. Total parasite
  2. Partial parasite

TapewormTapeworm

(b) Total Parasites 

Ans: The parasites that depend on the host for food and shelter are called total parasites. For example, liver fluke, tapeworm.

(c) Partial Parasites

Ans: Those parasites dependent on the host only for food are called partial parasites. For example, mosquitoes, lice, etc.

Q 2. What is Symbiosis? What is a symbiotic relationship?

Ans: It is the type of nutrition in which two different kinds of organisms depend on each other for their nutrition. In this, both the organisms are benefited from each other Example: Lichen. In this one, algae and one fungus live together and remain symbiotic.
Class 6 Science Chapter 1 Important Question Answers - Nutrition in PlantsSymbiotic Relationship: Some organisms live together and share shelter and nutrients. This type of relationship is called a symbiotic relationship.

Q 3. What are stomata? Explain their function.

Ans: Stomata are tiny pores on the underside of the leaf surface that are surrounded by guard cells. Their functions are to exchange gases by diffusion for photosynthesis and respiration and to cause transpiration by evaporation of water from the leaf surface.

Class 6 Science Chapter 1 Important Question Answers - Nutrition in Plants

Question for Important Questions: Nutrition in Plants
Try yourself:Q4: What is the function of stomata?
View Solution

Q.5. How does the plant use sunlight for photosynthesis?

Ans: Sunlight is the energy source for photosynthesis. It is trapped by the green pigment chlorophyll in the leaves and all green parts of the plants. The chlorophyll is present in organelles called chloroplasts. Most of the chlorophyll is present in the leaves; therefore, leaves are the major site for trapping sunlight to convert it to chemical energy.

Class 6 Science Chapter 1 Important Question Answers - Nutrition in Plants

Q 6. Explain how photosynthesis occurs in plants.

Ans: Photosynthesis is the process by which solar energy is converted to chemical energy by green plants. Simple inorganic molecules like carbon dioxide and water synthesize organic food like starch in this process. The reaction requires energy from sunlight. The pigment chlorophyll present in the leaves traps sunlight. The raw materials for photosynthesis are carbon dioxide and water. Carbon dioxide is absorbed from the atmosphere, whereas water is absorbed from the soil. The energy from sunlight converts carbon dioxide and water to starch and oxygen. Starch is used as food by plants and other animals, whereas oxygen is released into the atmosphere. The overall reaction of photosynthesis can be represented as follows:
Class 6 Science Chapter 1 Important Question Answers - Nutrition in Plants

Q 7. How can we demonstrate that chlorophyll is necessary for photosynthesis?

Ans: The importance of chlorophyll can be demonstrated by using a variegated leaf. The leaf outline is traced on paper, and the green areas are marked before the start of the experiment. The leaf is placed in sunlight for a few hours to allow photosynthesis. The leaf is then decolorized by boiling in alcohol. To this, an iodine solution is added. It can be observed that the green areas of the leaf turn blue-black in response to the iodine solution indicating the presence of starch. Thus, photosynthesis occurs in the green areas of the variegated leaf, showing that chlorophyll is important for photosynthesis.
Class 6 Science Chapter 1 Important Question Answers - Nutrition in Plants

Question for Important Questions: Nutrition in Plants
Try yourself:Q8: How is sunlight used by plants in photosynthesis?
View Solution

Q 9. How do plants obtain nutrients other than carbohydrates?

Ans: Plants synthesize carbohydrates using energy from sunlight to convert carbon dioxide and water to starch. The other nutrients are, however, obtained directly from the soil. Nitrogen is absorbed as soluble nitrogen compounds from the soil. The nitrogen compounds are present in the soil due to the action of nitrogen-fixing bacteria like Rhizobium that live in symbiotic association with the roots of leguminous plants. Nitrogen compounds can be replenished by adding fertilizers and manure to the soil. Some plants, like the pitcher plant and Venus flytrap, fulfill their nitrogen requirements by insectivory. In this case, the insects are trapped and digested by plant parts, releasing the nutrients into the plant body.

Q 10. Fill in the blanks:

(i) All organisms take ______ and utilize it to get energy for growth and the maintenance of their bodies.
(ii) Green plants synthesize their food themselves by the process of ______ and are called ______.
(iii) ______ energy is stored by the leaves with the help of chlorophyll.
(iv) ______derive nutrition from dead, decaying matter.
(v) Plants like cuscuta take food from ______ plant.
(vi) All animals are categorized as ______.
(vii) ______ is produced and ______ is utilized during photosynthesis. 

Ans:

(i) All organisms take food and utilize it to get energy for growth and the maintenance of their bodies.
(ii) Green plants synthesize their food themselves by the process of photosynthesis and are called autotrophs.
(iii) Solar energy is stored by the leaves with the help of chlorophyll.
(iv) Fungi/saprotrophs derive nutrition from dead, decaying matter.
(v) Plants like Cuscuta take food from the host plant.
(vi) All animals are categorized as Heterotrophs.
(vii) Oxygen is produced, and carbon dioxide is utilized during photosynthesis.

Q 11What is the mode of nutrition in fungi?

Ans: The mode of nutrition in fungi is heterotrophic. They cannot synthesize their food and depend on other ‘organisms’ for their carbon source. They perform extracellular digestion by releasing enzymes into their environment and obtaining organic and inorganic nutrients through absorption.  

Class 6 Science Chapter 1 Important Question Answers - Nutrition in PlantsThere are three main ways of obtaining nutrition:  
(i) Saprotrophic: Decomposition of ‘dead organic matter’.  
(ii) Parasitic: Feeding from a living host.
(iii) Mutualism: Living in a mutually beneficial interaction with another organism. (Example: lichen is a mutualism between fungi and algae).

Question for Important Questions: Nutrition in Plants
Try yourself:Q12: Which of the following terms is used to describe organisms that depend on other living organisms for food?
View Solution

Q 13Choose the true (T) and false (F) statements:

(i) Food is essential for all living beings.
(ii) Leaves are the food factories of plant.  
(iii) Water comes into leaves through stomata in the form of vapours.  
(iv) Plants utilize the carbon dioxide dissolved in the water absorbed by the roots for photosynthesis.  
(v) The sun is the ultimate source of energy for all living organisms.  
(vi) Algae are saprotrophs.
(vii) Cuscuta is a parasite. 
(viii) Saprotrophs take their food in solution form from dead and decaying matter. 
(ix) Insectivorous plants are partial Heterotrophs. 
(x) Plants take atmospheric nitrogen through stomata and utilize a nutrient. 
(xi) Pitcher plant is an insectivorous plant. 
(xii) Many fungi are saprotrophs. 
(xiii) ‘Leaves’ of a plant is called its food factory. 
(xiv) Insectivorous plants eat insects to fulfill their needs for energy.

Ans:

(i) Food is essential for all living beings. - True
(ii) Leaves are the food factories of plant.- True
(iii) Water comes into leaves through stomata in the form of vapors.- False
(iv) Plants utilize the carbon dioxide dissolved in the water absorbed by the roots for photosynthesis.- False
(v) The sun is the ultimate source of energy for all living organisms. - True
(vi) Algae are saprotrophs. - False 
(vii) Cascuta is a parasite.  - True
(viii) Saprotrophs take their food in solution form from dead and decaying matter.  - True
(ix) Insectivorous plants are partial Heterotrophs.  - True
(x) Plants take atmospheric nitrogen through stomata and utilize a nutrient. - False
(xi) Pitcher plant is an insectivorous plant. - False
(xii) Many fungi are saprotrophs. - True
(xiii) ‘Leaves’ of a plant is called its food factory. - True
(xiv) Insectivorous plants eat insects to fulfill their needs for energy. - True

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FAQs on Class 6 Science Chapter 1 Important Question Answers - Nutrition in Plants

1. What is the process of photosynthesis in plants?
Ans. Photosynthesis is the process by which green plants, algae, and some bacteria convert light energy, usually from the sun, into chemical energy in the form of glucose, using carbon dioxide and water.
2. Why is chlorophyll important for plants?
Ans. Chlorophyll is important for plants as it is the pigment responsible for capturing light energy during photosynthesis. It absorbs sunlight and uses it to convert carbon dioxide and water into glucose and oxygen.
3. How do plants obtain nutrients for their growth and development?
Ans. Plants obtain nutrients for their growth and development through their roots. The roots absorb water and mineral nutrients from the soil, which are essential for various metabolic processes in the plant.
4. What are the different ways in which plants can obtain nutrients?
Ans. Plants can obtain nutrients through various ways such as through the soil, air, and water. They absorb mineral nutrients from the soil, carbon dioxide from the air, and water from the soil and through the process of transpiration.
5. Why is nutrition important for the growth and survival of plants?
Ans. Nutrition is important for the growth and survival of plants as it provides them with essential nutrients and energy for carrying out metabolic processes such as photosynthesis, respiration, and growth. Without proper nutrition, plants would not be able to grow, reproduce, or survive.
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