Table of Contents
How long is pollen tube?
For example, the maize pollen tube can grow as fast as 1 cm/h and extend to about 1 ft in length within 24 h (Barnabas and Fridvalszky, 1984). During the elongation process, the pollen cytoplasm, vegetative nucleus and sperm cells are transported within the tube, which grows through intercellular spaces in the pistil.
What does the stigma Do?
Stigma is the topmost part of carpels in the gynoecium of a flower. In all flowering plants, stigma functions as a receptive tip, which collects pollen grains.
What happens after pollen germination?
After pollen germinates, the tube penetrates the stigmatic surface and grows into the transmitting tissue of the style. Mascarenhas and Machlis (1962) found a chemotropic response of pollen tubes to Ca2+ and observed a gradient of Ca2+ concentrations from the stigma to the ovule in the pistil of A. majus.
What are the symptoms of a kidney cyst?
Kidney Cyst Symptoms
- Pain in your side, back, or upper abdomen if they enlarge and press on other organs.
- Fever, chills, or other signs of infection.
- Blood in your urine.
- Blocked blood or urine flow through your kidneys (rare)
- Impaired kidney function (rare)
Can renal cysts cause pain?
In most cases, simple kidney cysts do not cause symptoms and usually do not require treatment. However, in some cases simple kidney cysts can grow large enough and cause a dull pain in a person’s back, side or upper abdomen. These cysts can also get infected, causing pain, fever and tenderness.
How do pollen grains enter the ovary?
The pollen tube ultimately enters an ovule through the micropyle and penetrates one of the sterile cells on either side of the egg (synergids).
What is the function of pollen?
Pollen is essential for sexual reproduction of flowering plants and plants that produce cones. Each pollen grain contains male gametes necessary for fertilisation. The scientific study of living and fossilised pollen grains is known as palynology. The male part of flowering plants is the stamen.
What is the difference between ovary and stigma?
Stigma: The part of the pistil where pollen germinates. Ovary: The enlarged basal portion of the pistil where ovules are produced.
What happens to ovary after fertilization?
After fertilization occurs, each ovule develops into a seed. Each seed contains a tiny, undeveloped plant called an embryo. The ovary surrounding the ovules develops into a fruit that contains one or more seeds.
When the ovary becomes fertilized it will grow into this structure?
The ovary contains ovules, which develop into seeds upon fertilization. The ovary itself will mature into a fruit, either dry or fleshy, enclosing the seeds.
What is a simple ovarian cyst?
Simple ovarian cysts are fluid-filled sacs, and they are fairly common in both premenopausal and postmenopausal women. These sacs don’t typically lead to cancer or an increased risk of it, and many simple ovarian cysts will disappear on their own without treatment.
What causes an ovary to develop into a fruit?
The ovary contains ovules, which develop into seeds upon fertilization. The ovary itself will mature into a fruit, either dry or fleshy, enclosing the seeds. A simple or unicarpellate ovary is formed from a single carpel, an evolutionarily modified leaf. It has one locule (chamber), within which are the ovules.
How many pollen grains enter the ovary?
When more than one pollen grain lands on a stigma whose ovary contains only one ovule, usually only one pollen tube can successfully enter the ovule while the other pollen tubes stop growing.
Does pollen contain sperm?
There is no sperm present in a pollen grain. A pollen grain is a tiny male plant, a male gametophyte (gamete-forming plant). He is a multicellular organism (usually two cells in flowering plants, but more in the case of gymnosperm pollen) capable of producing sperm if he gets an opportunity.
What is pollen allergy?
Pollen allergy is an allergic condition affecting the mucous membranes of the nose and the eyes etc., usually characterized by nasal discharge, nasal congestion, and itchy and watery eyes, itchy nose, inner ears and roof of the mouth, that are caused by a hypersensitivity to airborne pollen, such as the pollen of trees …
What is ovarian seed?
ovary, in botany, enlarged basal portion of the pistil, the female organ of a flower. The ovary contains ovules, which develop into seeds upon fertilization. The ovary itself will mature into a fruit, either dry or fleshy, enclosing the seeds.
What are the symptoms of ovarian cancer?
What Are the Symptoms of Ovarian Cancer? 1 Vaginal bleeding (particularly if you are past menopause), or discharge from your vagina that is not normal for you. 2 Pain or pressure in the pelvic area. 3 Abdominal or back pain. 4 Bloating. 5 Feeling full too quickly, or difficulty eating. 6 (more items)
What does ovarian cyst pain feel like?
The pain from ovarian cysts may feel sharp or dull. You may feel pain for extended periods of time, or it may come and go. Ovarian cyst-related pain tends to be worse during your menstrual period. The hormones produced during your period can cause ovarian cysts to form or enlarge, triggering pain.
How do you know if your ovaries are enlarged?
persistent abdominal discomfort, such as bloating or nausea Sometimes, the ovaries may become so enlarged that a person or doctor can feel the ovary in the pelvis, but this is not often the case. When someone has symptoms that could indicate enlarged ovaries or another ovarian condition, a doctor is likely to recommend an ultrasound.
What are the symptoms of ovarian torsion?
Symptoms of ovarian torsion include: pain in the lower belly and pelvis, which can come and go or be continuous