Euglena also have an eyespot at the anterior end that detects light, it can be seen near the reservoir. This helps the euglena find bright areas to gather sunlight to make their food.

An eyespot is a simple organ in biology used to detect light. It may be called an ocellus, or pigment pit. They are quite common in small, simple invertebrates, such as Planaria.

Eyespot which is a light-sensitive organelle, which helps the Chlamydomonas to swim toward the light.

1 : a usually small spot of color (as on the wing of a butterfly) that resembles an eye. 2a : a simple visual organ of pigment or pigmented cells covering a sensory termination : ocellus.

Cilia: The fine hairlike projections from certain cells such as those in the respiratory tract that sweep in unison and help to sweep away fluids and particles. Cilia is the plural of cilium, a Latin word referring to the edge of the eyelid and, much later, to the eyelashes.

The function of cilia is to move water relative to the cell in a regular movement of the cilia. This process can either result in the cell moving through the water, typical for many single-celled organisms, or in moving water and its contents across the surface of the cell.

Cilia: The fine hairlike projections from certain cells such as those in the respiratory tract that sweep in unison and help to sweep away fluids and particles. Some single-celled organisms use the rhythmical motion of cilia for locomotion.

The eyelash. Cilia are generally of two kinds: motile cilia (for locomotion) and non-motile cilia (for sensory). Example of tissue cells with cilia are the epithelia lining the lungs that sweep away fluids or particles. Examples of organisms that have cilia are protozoans that use them for movement.

‘Motile’ (or moving) cilia are found in the lungs, respiratory tract and middle ear. These cilia have a rhythmic waving or beating motion. They work, for instance, to keep the airways clear of mucus and dirt, allowing us to breathe easily and without irritation. They also help propel sperm.

Cilia are short, hair like appendages extending from the surface of a living cell. Flagella are long, threadlike appendages on the surface of a living cell. Occurs throughout the cell surface. Presence at one end or two ends or all over the surface.

Cilia are present in organisms such as paramecium while flagella can be found in bacteria and sperm cells. Cilia are shorter and numerous than flagella. Organisms with cilia can move faster and more efficiently.

The motile tail of a sperm is a long flagellum, whose central axoneme emanates from a basal body situated just posterior to the nucleus.

Sperm swim by means of a prominent flagellum, composed of a core of microtubules, whose sliding is powered by flagellar dynein. This array of microtubules and associated motor and linker proteins is known as an axoneme.

Along with cramping, you may experience what is called implantation bleeding or spotting. This usually happens 10 to 14 days after conception, around the time of your usual period. Implantation bleeding is usually much lighter than your regular menstrual period bleeding.

Fishy, rotten, or foul-smelling semen isn’t normal. Eating certain foods — like asparagus, meats, and garlic — or drinking a lot of caffeine or alcohol can make your semen smell pungent. Try limiting these foods to see if your semen smell returns to normal after a few days. If so, there’s nothing to be concerned about.

Female sperm Nayernia says that researchers have produced the same early-stage sperm cells in mice from bone marrow cells taken from female mice. “It should be perfectly possible for fully functional mature sperm cells to be made from these female-derived cells too,” he told New Scientist.

The answer is — yes! While it isn’t likely, any activity that introduces sperm to the vaginal area makes pregnancy possible without penetration.

There are no good scientific or medical reasons to make human babies from artificial embryos made without sperm or eggs, says Nicolas Rivron at the Institute of Molecular Biotechnology in Vienna, Austria.

They have both eggs and sperms in their body and at fertilization, one sperm cell fuses with oocyte to form an embryo. Self-fertilization may also occur in human. Both gonads are functional and produce spermatozoa and oocyte respectively after puberty.

Frequent ejaculation will not cause the body to run out. Although it takes the average sperm about 74 days to fully mature, the body makes millions of sperm each day. Men with healthy, normal sperm counts should not worry about the effects of regular ejaculation.

No evidence suggests blocking sperm can cause harm or negative side effects. Unejaculated sperm is not harmful to the body and does not build up. The body reabsorbs sperm that does not leave through ejaculation. This has no side effects on sex drive or fertility.