Nutrition in Plants: Class 7 Science Q&A
13 free answers on Nutrition in Plants (Science) for Class 7 students, across CBSE, ICSE and State boards. Includes questions such as “Give a brief description of the process of synthesis of food in green plants.”, “How would you test the presence of starch in leaves?”, “Distinguish between a parasite and a saprophyte.”
Question & Answer
Questions
- ScienceClass 7CBSE
Why do farmers grow many fruits and vegetable crops inside large greenhouses? What are the advantages to the farmers?
Solution: Fruits and vegetable crops are grown in large greenhouses because it protects crops from external climatic conditions and provides suitable temperature for the growth of crops. Advantages to farmers while growing fruits and vegetable crops inside greenhouses are It protects crops from diseases and adverse climatic conditions. It protects crops from wind and rodents
- ScienceClass 7CBSE
Choose the correct option from the following: Plants take carbon dioxide from the atmosphere mainly through their: (i) roots (ii) stem (iii) flowers (iv) leaves
Solution: The answer is (iv) leaves
- ScienceClass 7CBSE
Choose the correct option from the following: Which part of the plant takes in carbon dioxide from the air for photosynthesis? (i) Root hair (ii) Stomata (iii) Leaf veins (iv) Petals
Solution: The answer is (ii) Stomata
- ScienceClass 7CBSE
10. Mark ‘T’ if the statement is true and ‘F’ if it is false. (i) Carbon dioxide is released during photosynthesis. (T/F) (ii) Plants which synthesise their food are called saprotrophs. (T/F) (iii) The product of photosynthesis is not a protein. (T/F) (iv) Solar energy is converted into chemical energy during photosynthesis. (T/F)
Solution: False False True True
- ScienceClass 7CBSE
Match the items given in Column I with those in Column II. Column-I Column-II Chlorophyll Rhizobium Nitrogen Heterotrophs Cuscuta Pitcher plant Animals Leaf Insects Parasite
Solution: Column-I Column-II Chlorophyll Leaf Nitrogen Rhizobium Cuscuta Parasite Animals Heterotrophs Insects
- ScienceClass 7CBSE
Tick the correct answer. (a) Cuscuta is an example of: (i) autotroph (ii) parasite (iii) saprotroph (iv) host (b) The plant which traps and feeds on insects is: (i) Cuscuta (ii) China rose (iii) pitcher plant (iv) rose
Solution: (a) (ii) Parasite (b) (iii) pitcher plant
- ScienceClass 7CBSE
Name the following. i) A parasitic plant with a yellow, slender and branched stem. ii) A plant that is partially autotrophic. iii) The pores through which leaves exchange gases.
Solution: i) Cuscuta ii) Pitcher plant iii) Stomata
- ScienceClass 7CBSE
(a) Green plants are called _________________ since they synthesise their own food. (b) The food synthesised by plants is stored as _________________. (c) In photosynthesis, solar energy is absorbed by the pigment called ___________. (d) During photosynthesis, plants take in ______________________ and release __________________ gas.
Solution: (a) Green plants are called autotrophs since they synthesise their food. (b) The food synthesised by plants is stored as starch. (c) In photosynthesis, solar energy is absorbed by the pigment called chlorophyll. (d) During photosynthesis, plants take in carbon dioxide and release oxygen gas.
- ScienceClass 7CBSE
Give a brief description of the process of synthesis of food in green plants.
Solution: Green plants use a process called photosynthesis to prepare their food. The process is as follows Water is taken from the roots of the plant, and it is transported to the leaves of the plant. Carbon dioxide from the air enters the leaves through pores called stomata. This diffuses the cell containing chlorophyll. Water molecule is broken down into Hydrogen and Oxygen with the help of sunlight. Hydrogen combines wi
- ScienceClass 7CBSE
How would you test the presence of starch in leaves?
Solution: Take two potted plants of the same kind. Keep one in the dark for 72 hours and the other in the sunlight. Perform the iodine test with the leaves of both plants as given below. Now, leave the pot, which was earlier kept in the dark, undisturbed for 3–4 days and perform the iodine test again on its leaves. Iodine test: Put iodine solution on the leaf. Observation: Blue-black colour will b
- ScienceClass 7CBSE
Distinguish between a parasite and a saprophyte.
Solution: Saprophytes Parasites Acquire nutrients from dead and decaying matter. Parasites live on or in a host and get their food at the expense of their host. Example: Fungi Example: Roundworm
- ScienceClass 7CBSE
Why do organisms take food?
Solution: All organisms require energy for their life processes. Plants prepare their food and acquire nutrients from abiotic components like soil, air, water and sunlight. On the other hand, animals need to get food from either plants or other animals to obtain nutrients; hence, animals need to take food to acquire nutrients and energy.
- ScienceClass 7All
What is autotrophic nutrition?
Autotrophic nutrition is a mode of nutrition in which organisms produce their own organic substances, such as carbohydrates, from inorganic raw materials. These organisms are referred to as autotrophs, and they can synthesize their own food using sunlight or inorganic compounds as a source of energy. Autotrophic nutrition is a characteristic feature of plants, algae, and some bacteria. There are two main types of autotrophic nutrition: Photosynthesis: