Q1: Why do organisms need to take food?
Ans:
Food is required by all living organisms mainly for four reasons or purposes:
Q2:Distinguish between a parasite and a saprotroph.
Ans:
Parasite | Saprotroph |
|
|
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:
Ans:
Q6: Name the following:
Ans:
Q7: Tick the correct answer:
Ans:
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 :
Ans:
Q10: Choose the correct option in the following:
Which part of the plant gets carbon dioxide from the air for photosynthesis?
Ans: (ii) Stomata
Q11: Which is the correct option in the following:
Plants take carbon dioxide from the atmosphere mainly through their -
Ans: (iv) Leaves.
1. What is nutrition in plants? |
2. How do plants obtain nutrients? |
3. What is photosynthesis? |
4. What are the essential nutrients required by plants? |
5. How do plants adapt to different nutrient availability in their environment? |
|
Explore Courses for Class 7 exam
|