Advertisements
Advertisements
Question
Onion cells have no chloroplast. How can we tell they are plants?
Advertisements
Solution
- The bulb of an onion is a modified form of leaves.
- While photosynthesis takes place in the leaves (present above the ground) of an onion containing chloroplast, the little glucose that is produced from this process is converted into starch (starch granules) and stored in the bulb.
- Starch act as reserved food material in plants.
- Using an iodine solution, we can test for the presence of starch in onion cells. If starch is present, the iodine changes from brown to blue-black or purple. Hence, we can say that though onion cells have no chloroplast they are considered as plants.
APPEARS IN
RELATED QUESTIONS
Choose the correct option.
Which of the following set of organelles contain DNA?
Answer the following question.
Is nucleolus covered by membrane?
Answer the following question.
The RBC surface normally shows glycoprotein molecules. When determining blood group do they play any role?
Answer the following question.
Mitochondria are power house of the cell. Give reasons.
Label the diagram and write down the detail of concept in your word.
Label the diagram and write down the detail of the concept in your word.
Label the diagram and write down the detail of concept in your word.
Identify cell structure or organelle from it's the description below.
Carrys out photosynthesis
Identify cell structure or organelle from it's the description below.
Manufactures ATP in animal and plant cells.
Identify cell structure or organelle from its description below.
Can bud of vesicles, which form the golgi apparatus.
