Which of the following substances is insoluble in water?
(A) Salt
(B) Sugar
(C) Chalk powder
(D) Milk
Correct Answer : C Explanation : Chalk powder, which primarily consists of calcium carbonate, is relatively insoluble in water. While it can react very slowly with water over time to form soluble calcium bicarbonate, the solubility of chalk powder in water is extremely low, making it effectively insoluble for most practical purposes.
Q :
What is the action of accommodation in eye lens?
(A) by iris
(B) through eye lens
(C) by ciliary muscles
(D) by cornea
Correct Answer : C Explanation : Accommodation in the eye lens is the process of adjusting its shape to focus on objects at different distances. This adjustment is controlled by the ciliary muscles. When focusing on nearby objects, these muscles contract, thickening the lens. For distant objects, the muscles relax, flattening the lens, ensuring clear vision at varying distances.
Q :
Which of the following gas causes explosion in coal mines?
(A) Carbon dioxide
(B) Nitrogen
(C) Butane
(D) Methane
Correct Answer : D Explanation : Methane is the gas that can cause explosions in coal mines. Methane is a highly flammable gas, and when it accumulates in high concentrations in confined spaces like coal mines, it poses a significant risk. Methane explosions can occur if the gas comes into contact with an ignition source, such as a spark or flame, leading to a dangerous explosion. That's why proper ventilation and safety measures are crucial in coal mines to prevent methane buildup and potential explosions.
Q :
occurs in the human eye?
(A) concave lens
(B) convex mirror
(C) convex lens
(D) concave mirror
Correct Answer : C Explanation :
convex lenses are used in the human eye to help focus light onto the retina, allowing us to see clearly. The natural lens in the human eye is flexible and can change its shape, allowing it to adjust the focal length and focus on objects at different distances. This process is called accommodation and is essential for clear vision.
Q :
The junction between the axon of one neuron and the dendrite of the next is called
(A) A joint
(B) A synapse
(C) Constant bridge
(D) Junction point
Correct Answer : B Explanation :
The junction between the axon of one neuron and the dendrite (or cell body) of the next neuron is called a synapse. At the synapse, electrical or chemical signals are transmitted from one neuron to another or to an effector cell, such as a muscle cell or gland cell. Synapses play a crucial role in the transmission of nerve impulses within the nervous system.
Q :
Respiration takes place?
(A) green cleaver
(B) ribosome
(C) in lysosomes
(D) microconidia
Correct Answer : D
Q :
Being a highly reactive element, it is not found in free state in nature.
(A) iron
(B) sodium
(C) aluminum
(D) magnesium
Correct Answer : B Explanation : Sodium is a highly reactive element and is not found in its free state in nature due to its high reactivity. It readily reacts with other elements and compounds, forming various salts and minerals. Sodium is commonly found in the Earth's crust and in seawater as compounds, such as sodium chloride (table salt).
Q :
What is the end product of anaerobic respiration?
(A) fumaric
(B) pyruvic acid
(C) lactic acid
(D) Water
Correct Answer : C Explanation :
lactic acid is one of the end products of anaerobic respiration in humans and some other organisms. During anaerobic respiration, which occurs in the absence of oxygen, glucose is partially broken down to generate energy. In the absence of oxygen, cells can convert pyruvate, a product of glycolysis, into lactic acid. This process, called lactic acid fermentation, helps generate energy in the absence of oxygen but also leads to the accumulation of lactic acid, causing muscle fatigue and soreness.
Q :
Who used the word histology for the first time?
(A) Memon
(B) schleiden
(C) robert hook
(D) Mayor
Correct Answer : D Explanation : The term "histology" was first used by the French physician Marie François Xavier Bichat, but it was popularized and introduced into English by the Swiss anatomist Karl Wilhelm von Nägeli in the early 19th century.
Q :
The yellow color of human urine is due to what?
(A) Blood
(B) cholesterol
(C) Bile
(D) Urochrome
Correct Answer : D Explanation : The yellow color of human urine is primarily due to a pigment called urochrome. Urochrome is a waste product resulting from the breakdown of hemoglobin, a protein in red blood cells. The varying shades of yellow in urine can be influenced by factors such as hydration levels, diet, and certain medications, but urochrome is the main pigment responsible for the typical yellow color of urine.