Question
Differentiate between egg cells and secondary nucleus found in embryo sac of angiosperms.
✓
Answer
Differences between Egg cell and Secondary nucleus :
| S.No. | Egg Cell | Secondary Nucleus |
| 1 | It is situated closely to micropyle inembryo sac. | It is situated almost in the middle of embryo sac. |
| 2 | Egg cell is surrounded by synergids on either side. | It is not surrounded by any structure. |
| 3 | It has only one nucleus which has haploid no. of chromosomes. | It has two haploid nuclei which fuse together forming diploid secondary nucleus. |
| 4 | It fuses with male gamete to produce zygote (2n). | It fuses with male gamete to produce primary endosperm nucleus (3n). |
Need a full question paper?
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
Explore more
Similar questions
Why is predation important and required in a community with rich biodiversity? Explain with the help of suitable examples.
OR
What is 'predation"? Explain with the help of suitable examples, why it is required in a community with rich biodiversity.What are exotic species? Explain with the help of two examples how the exotic species disturb the native species of an ecosystem?
Rahul introduced Ronit to his uncle and told him that Ronit is pursuing a course in biotechnology in America.
His uncle had never heard of this term earlier and was curious to know about this term. Ronit pointed towards a big tree at the base of which were present numerous tumour-like structures and said that this is the example of natural biotechnology:
His uncle had never heard of this term earlier and was curious to know about this term. Ronit pointed towards a big tree at the base of which were present numerous tumour-like structures and said that this is the example of natural biotechnology:
- What is biotechnology?
- How these crown gall tumours are formed?
- What are the values shown by Rahul's uncle?
Refer to the diagram given below and answer the questions that follow.
- The parasite reproduces in human host by which method?
- The sexual stages of parasite are referred to as?
- Where does the fertilisation and development of parasite takes place in mosquito body?
- What are sporozoites?
- What is the cause of cycles of fever during malaria?
A vector is engineered with three features, which facilitates its cloning within host cell. List three features and explain each one of them.
- Mention the specific geographical region where these organisms are found.
- Name and explain the phenomenon that has resulted in the evolution of such diverse species in the region.
- Explain giving reasons the existence of placental wolf and Tasmanian wolf sharing the same habitat.
What are fossils? Mention any two ways in which the study of fossils support biological evolution of an organism.
Pollen grains are both useful and harmful. Justify the statement.
Differentiate between in situ and ex situ approaches of conserving biodiversity.
Draw a Punnett square diagram showing the incomplete dominance.