Advertisements
Advertisements
Question
Onion cells have no chloroplast. How can we tell they are plants?
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.
Lysosomes are not help full in ______.
Answer the following question.
Is nucleolus covered by membrane?
Answer the following question.
Fluid mosaic model proposed by Singer and Nicolson replaced Sandwich model proposed by Danielli and Davson? Why?
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.
Answer the following question.
What are the types of plastids?
Label the diagram and write down the detail of the concept in your word.
Identify cell structure or organelle from its description below.
Manufactures ribosomes
Identify cell structure or organelle from its description below.
Selectivelly permeable.
Which of the following is not present in mitochondrial matrix?
