Biology Online Test For Competitive Exams

The wisdom teeth is not a part of the milk teeth that is present for any individual, it arises slowly and joins with the permanent teeth of an individual. That’s why these teeth normally grows during the age of 17 – 30 years.

Urine color generally ranges from a pale-yellow color to deep amber. This coloring is primarily caused by the pigment urochrome, also known as urobilin.

Cell fragments called platelets are essential to promote blood clotting.

Maxillary molars usually have three roots.

The glands are structures in which the cells are involved in the production of hormones or secretions. These hormones or secretions have an effect on the substrates. There are cells in the stomach which are responsible for the production of mucus, HCl, digestive enzymes, etc. There are glandular cells in the stomach but the stomach is not considered as a gland.

Decibel levels help us to understand the loudness of a sound with respect to a reference level. A decibel level of zero dB represents the lowest level of sound and a level of 80 dB represents the level of pain for humans.

There are about 700 named skeletal muscles in the human body, including roughly 400 that no one cares about except specialists. There is just one important cardiac muscle.

The amnion or amniotic sac protects everyone embryo from desiccation, it contains amniotic fluid which cushions the embryo from shocks.

The sex chromosomes are referred to as X and Y, and their combination determines a person’s sex. Typically, human females have two X chromosomes while males possess an XY pairing.

Saliva contains the enzyme amylase that breaks some starches down into maltose and dextrin.

Biological death occurs when brain cells start to die due to lack of oxygen.

Radial keratotomy (RK) is a refractive surgical procedure to correct myopia (nearsightedness) that was developed in 1974, by Svyatoslav Fyodorov, a Russian ophthalmologist.

The most obvious difference between male and female voices is pitch — what we perceive as a high or deep voice. Men, on average, speak almost an octave lower than women.

The normal temperature of human body is 36.850 C. Temperature in kelvin = 36.85 273.15 = 310 K

Blood groups are inherited from both parents. The ABO blood type is controlled by a single gene (the ABO gene) with three types of alleles inferred from classical genetics: i, I^A, and I^B.

Just like eye or hair color, our blood type is inherited from our parents. Each biological parent donates one of two ABO genes to their child. The A and B genes are dominant and the O gene is recessive. For example, if an O gene is paired with an A gene, the blood type will be A.

Sleeping fewer than six hours a night could be linked to increased blood pressure. People who sleep five hours or less a night may be at higher risk of developing high blood pressure or worsening already high blood pressure.

Eating salt raises the amount of sodium in your bloodstream and wrecks the delicate balance, reducing the ability of your kidneys to remove the water. The result is a higher blood pressure due to the extra fluid and extra strain on the delicate blood vessels leading to the kidneys.

The average human brain weighs in at about three pounds, or 1,350 grams.

The lens of the human eye is biconvex. When we see an object, the light rays from the object get refracted and as a result of that the image will focus on the retina. The image thus formed is real and inverted.

In 1954, the kidney was the first human organ to be transplanted successfully.

Melanin is the pigment that determines skin colour as well as hair and eye colour. Melanin is produced by skin cells when they are exposed to the sun.

The small intestine is the largest part of the alimentary canal in humans. In an adult human, the small intestine is approximate $6.5$ metres long.

According to scientist human sperm cell is the smallest cell of a human body. The red blood cells are also considerably small of the size of about 5 micrometer.

Insulin helps control blood glucose levels by signaling the liver and muscle and fat cells to take in glucose from the blood.

As the food is digested in the small intestine and dissolved into the juices from the pancreas, liver, and intestine, the contents of the intestine are mixed and pushed forward to allow further digestion.

Humans have 24 ribs, in 12 pairs. All are attached at the back to the thoracic vertebrae, and are numbered from 1–12 according to the vertebrae they attach to.

There are 29 bones present in the human skull. These includes 8 cranial bones, 14 facial bones, one hyoid bone and 6 auditory bones. So the correct answer is ’29’.

Your femur, or thighbone, is the largest bone in your body. The head of your femur fits into your hip socket and the bottom end connects to your knee.