Class 7 Exam  >  Class 7 Notes  >  Short Question Answer - Nutrition in Plants, Science, Class 7

Short Question Answer - Nutrition in Plants, Science, Class 7 PDF Download

Q1: Why do organisms need to take food?

Ans:

Food is required by all living organisms mainly for four reasons or purposes:

  • Food helps a living organism to grow. If enough food is not given or if, the food given is not of right kind, the organism will not have proper growth.
  • Another important function of food is to provide energy which is required for any living organism for movements and other activities.
  • Food is also needed by living organisms for replacement and repairing of their damaged parts.
  • Food provide us the power to fight against infections and diseases.

 

Q2:Distinguish between a parasite and a saprotroph.

Ans:

Parasite Saprotroph
  1. A parasite takes readymade food from the organism on which it feeds.
  2. They feed on a living organism.
  3. The organism on which it feeds is called host.
  4. It deprives the host of valuable nutrients.
  1. They secrete the digestive juices on the matter they live and convert it into a solutionand then absorb it.
  2. They feed on dead and decaying organism.
  3. They do not feed on a living organism.
  4. There is no host at all.

 

Q3: How would you test the presence of starch on leaves?

Ans:

The presence of starch on leaves can be tested by Iodine Test. Iodine turns starch solution blue.

 

 

Q4: Give a brief description of the process of synthesis of food in green plants.

Ans:

Leaves have a green pigment called chlorophyll. In presence of sunlight, they use carbon dioxide and water to synthesize carbohydrate. During this process oxygen is released. The carbohydrates ultimately get converted into starch.

Carbon dioxide from air is taken through stomata. Water and minera;ls are absorbed by roots and transported to leaves.

 

 

Q5: Fill in the blanks:

  1. Green plants are called _______ since they synthesize their own food.
  2. The foods synthesized by the plants are stored as _______.
  3. In photosynthesis solar energy is captured by the pigment called ______.
  4. During photosynthesis plants take in ____________ and release ______.

Ans:

  1. autotrophs
  2. starch
  3. chlorophyll
  4. carbon dioxide, oxygen.

 

 

Q6: Name the following:

  1. A parasitic plant with yellow, slender, tubular stem.
  2. A plant that has both autotrophic and heterotrophic mode of nutrition.
  3. The pores through which leaves exchange gases.

Ans:

  1. Cascuta
  2. Insectivorous plants
  3. Stomata.

 

 

Q7: Tick the correct answer:

 

  1. Amarbel is an example of -
    1. Autotroph
    2. Parasite
    3. Saprotroph
    4. Host
  2. The plant which taps and feeds on insects is -
    1. Cuscuta
    2. China rose
    3. Pitcher plant
    4. Rose

Ans:

  1. Parasite
  2. Pitcher Plant.

 

 

Q8: Match the items in column I with those in column II:

Column I Column II

Chlorophyll

Nitrogen

Amarbel

Animals

Insects

Bacteria

Heterotrophs

Pitcher Plant

Leaf

Parasite

Ans:

Chlorophyll ---- Leaf.

Nitrogen --- Bacteria.

Amarbel --- Parasite.

Animals --- Heterotrophs.

Insects --- Pitcher Plant.

 

 

Q9: Mark “T” if the statement is true and “F” if it is false :

  1. Carbon dioxide is released during photosynthesis.
  2. Plants which synthesize their food themselves are called saprotroph.
  3. The product of photosynthesis is not a protein.
  4. Solar energy is converted into chemical energy during photosynthesis.

Ans:

  1. F
  2. F
  3. T
  4. T

 

 

Q10: Choose the correct option in the following:

Which part of the plant gets carbon dioxide from the air for photosynthesis?

  1. Root hair
  2. Stomata
  3. Leaf veins
  4. Sepals.

Ans: (ii) Stomata

 

Q11: Which is the correct option in the following:

Plants take carbon dioxide from the atmosphere mainly through their -

  1. Roots
  2. Stem
  3. Flowers
  4. Leaves.

Ans: (iv) Leaves.

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FAQs on Short Question Answer - Nutrition in Plants, Science, Class 7

1. What is nutrition in plants?
Ans. Nutrition in plants refers to the process by which plants obtain and utilize nutrients for their growth and development. It involves the absorption of water, minerals, and carbon dioxide, as well as the synthesis of food through photosynthesis.
2. How do plants obtain nutrients?
Ans. Plants obtain nutrients through their roots. The roots absorb water and minerals from the soil, while the leaves absorb carbon dioxide from the air. These nutrients are then transported to different parts of the plant through the vascular system.
3. What is photosynthesis?
Ans. Photosynthesis is the process by which plants convert sunlight, carbon dioxide, and water into glucose (a form of sugar) and oxygen. This process takes place in the chloroplasts of plant cells and is essential for the production of food and oxygen in the ecosystem.
4. What are the essential nutrients required by plants?
Ans. The essential nutrients required by plants include macronutrients (such as nitrogen, phosphorus, and potassium) and micronutrients (such as iron, zinc, and manganese). These nutrients are necessary for various metabolic processes and are obtained from the soil.
5. How do plants adapt to different nutrient availability in their environment?
Ans. Plants have various adaptations to cope with different nutrient availability in their environment. For example, some plants develop specialized roots, such as root nodules or mycorrhizae, to enhance nutrient absorption. Others can adjust their root growth or alter their metabolic processes to optimize nutrient utilization. These adaptations help plants survive and thrive in different nutrient conditions.
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