Difference between carpel and pistil with structure and functions
A modified and condensed shoot useful for reproduction in angiosperms is called a flower. Flowers are often described as a modified stem. The gynoecium is an essential part of the flower as it contains the female reproductive organisms.
Carpel and pistil are the two female reproductive organism units in flower, the part which you see from outside. Carpel is a long stick-like structural part in the flower that comprises a mixture of three essential parts; stigma, style, and ovary - the female parts of a flower. There can be one or more carpels present in a flower.
The pistil consists of stigma, ovary, and style, and is generally fused along with the female reproductive parts.
Let’s peer inside the structure of the carpel. The ovary is the basal, swollen part inside the bud, which is a fertile part in the carpel. If there is only one carpel, the ovary is called unilocular, which means chamber. If there are two, three, or five carpels fused with each other, that is, a polycarpellary syncarpous condition, then the ovary is bilocular, trilocular, or pentalocular. Each chamber of the ovary contains one to many small globular structures called ovules or megasporangia. Ovules are produced on a soft fertile tissue called the placenta. Different modes of arrangement are exhibited within the ovary.
Style is a narrow elongated threadlike tubular structure that connects the ovary with the stigma. The terminal part of the carpel which receives pollen grains during the process of pollination is called stigma. Pollen germination happens during that specific time. Stigma is generally rough and sticky in nature. When all three parts of a carpel are fused together, it is called pistil. Therefore, the collection of fused carpels is called pistils in the case of syncarpous.
What is a Carpel
Carpels are composed of the stigma, style, and ovary, the female parts of a flower. Flowers can have one or more carpels. It can also be defined as the fourth whorl of the flower present in the centre.
What is a Pistil
The word pistol is derived from the Latin term pistillum, pestle. It can either be the same as an individual carpel as it comprises stigma, style, ovary, or a carpel fused together. This means a pistil can have lots of carpels.
The major difference between the carpel and pistil is that the carpel is a single reproductive unit (bisexual organism), while the pistil is the collection of fused ovaries. Carpel has seed production, while pistils do not. The ultimate goal of the carpel is to disperse the seed, while the pistil works as the female reproductive system of the flower. Carpel produce eggs, while pistils do not. Fertilisation happens for carpels but not for pistils.
Important Facts Regarding Flower
1. Gynobasic style is a characteristic feature of the family labiate (Ocimum), where style arises from the depression or cavity in the center of the ovary or directly from the thalamus.
2. Feather-like stigma is called the plumose stigma, as in grasses (Gramineae).
3. Receptacle is the modified, flattened pendulous on which flowers lie in a specific manner.
4. An additional whorl of bract is called an involucre.
5. Gynoecium is considered a modified leaf (megasporophyll).
6. Rafflesia arnoldii has the largest flower.
7. Long filamentous threads protruding at the end of a young cob of maize are style.
8. The colored sepals other than green color are called sepaloid. Example: Garden nasturation.
9. The term staminode is given to reduced or non-functional stamens. Example: Saliva.
10. If only one carpel is present in the gynoecium, then this condition is called the monocarpellary condition.
11. If more than one carpel is present in the gynoecium, then this condition is known as polycarpellary.
12. When all carpels are fused, this condition is called syncarpous. Example: mustard and tomato.
FAQs on Carpel and Pistil in Flowering Plants
1. What is the difference between carpel and pistil?
The main difference between a carpel and a pistil is that a carpel is a single female reproductive unit, while a pistil may consist of one or more fused carpels.
- A carpel is the basic structural unit of the female reproductive organ.
- A pistil can be made of one carpel (simple pistil) or multiple fused carpels (compound pistil).
- In many flowers, the terms are used interchangeably when only one carpel is present.
2. What is a carpel in a flower?
A carpel is the basic female reproductive unit of a flower that encloses the ovules.
- It consists of three main parts: stigma, style, and ovary.
- The ovary contains one or more ovules, which develop into seeds after fertilization.
- Carpels may be free (apocarpous) or fused (syncarpous).
3. What is a pistil in botany?
A pistil is the female reproductive organ of a flower composed of one or more carpels.
- It includes the stigma (receives pollen).
- The style (connects stigma to ovary).
- The ovary (contains ovules).
4. What are the parts of a carpel?
A carpel consists of three main structural parts: the stigma, style, and ovary.
- Stigma: Sticky surface that receives pollen grains.
- Style: Slender stalk that allows the pollen tube to grow toward the ovary.
- Ovary: Swollen base containing one or more ovules.
5. What is the function of the carpel in a flower?
The primary function of the carpel is to produce and protect ovules and facilitate fertilization.
- Receives pollen on the stigma.
- Allows pollen tube growth through the style.
- Houses ovules inside the ovary.
- Develops into fruit after fertilization.
6. Can a flower have more than one carpel?
Yes, a flower can have multiple carpels, which may be free or fused together.
- Apocarpous flowers have free (separate) carpels.
- Syncarpous flowers have fused carpels forming a compound pistil.
7. How does fertilization occur in the carpel?
Fertilization in the carpel occurs when a pollen tube delivers male gametes to the ovule inside the ovary.
- Pollen lands on the stigma.
- A pollen tube grows through the style.
- Male gametes reach the ovule in the ovary.
- Double fertilization occurs in angiosperms.
8. Is ovary part of carpel or pistil?
The ovary is a part of both the carpel and the pistil.
- In a single carpel flower, the ovary belongs to that carpel.
- In a compound pistil, the ovary may be formed by fused carpels.
- The ovary contains the ovules, which develop into seeds.
9. What is meant by simple and compound pistil?
A simple pistil is made of one carpel, while a compound pistil is formed by two or more fused carpels.
- Simple pistil: Single ovary derived from one carpel (e.g., pea).
- Compound pistil: Fused carpels forming one ovary (e.g., hibiscus).
10. Why are carpels important in flowering plants?
Carpels are important because they enclose ovules and later form fruits that protect seeds.
- Provide protection to developing ovules.
- Enable efficient pollination and fertilization.
- Develop into fruits after fertilization.
