Explanation

• There is no such nitrogenous base as "Tracil".

The nitrogenous bases are:

1. Adenine (A)
2. Thymine (T)
3. Cytosine (C)
4. Guanine (G)

Explanation

• Fuel is the major source of release of direct pollutants in air pollution.
• Primarily due to the combustion of fossil fuels, which releases harmful pollutants into the atmosphere.

Fuel combustion releases pollutants such as:

• Particulate matter (PM)
• Carbon monoxide (CO)
• Nitrogen oxides (NOx)
• Sulfur dioxide (SO2)Volatile 
• organic compounds (VOCs)

These pollutants can come from various sources, including:

• Transportation (vehicles, airplanes)
• Industrial processes (power plants, refineries)
• Residential and commercial heating and cooking

Explanation

Seed germination requires three essential conditions:

1. Water (H2O): Seeds need water to break dormancy and initiate germination.
2. Oxygen (O2): Seeds require oxygen for cellular respiration and energy production.
3. Proper Temperature: Seeds germinate within a specific temperature range (usually between 16°C to 24°C), which activates enzymes and metabolic processes.

Explanation

• Animals, plants, human beings, and microorganisms are all examples of living components and biotic factors.
• Living components refer to the living organisms that make up an ecosystem or environment.
• Biotic factors refer to the living components of an ecosystem that interact with each other and their environment.

Explanation

The epithelium on the surface of the ovary is composed of simple cuboidal epithelium.

Simple cuboidal epithelium is found:

• on the surface of the ovaries
• the lining of nephrons
• the walls of the renal tubules
• parts of the eye and thyroid

Explanation

Vitamin C deficiency can cause:

Scurvy, a disease characterized by:

• Fatigue and weakness
• Bleeding gums and loose teeth
• Joint pain and swelling
  
• Poor wound healing

Explanation

The skin is sensitive to:

• Temperature (hot and cold)
• Touch (light and heavy pressure)
• Pressure (firm and gentle)
• Pain (sharp and dull)

Explanation

The mediolateral episiotomy is often recommended

Because it provides better healing and reduces the risk of severe tears extending into the anal sphincter.

An episiotomy is a surgical procedure where a small cut is made to widen the vaginal opening during childbirth. 

Explanation

Reduced growth hormone levels are not typically associated with anorexia nervosa.

Anorexia nervosa is an eating disorder characterized by restrictive eating, fear of gaining weight, and distorted body image.

Some common features of anorexia nervosa include:

• hypokalemia (low potassium levels)
• low LH (luteinizing hormone)
• impaired glucose tolerance
• low FSH (follicle-stimulating hormone)
  

Explanation

Arterial pH remains relatively stable during pregnancy

Reflecting the effective regulation of acid-base balance by the body's homeostatic mechanisms.

During pregnancy, the respiratory system changes to accommodate the needs of the fetus while arterial pH typically remains stable.

These include:

• increased oxygen consumption
• alterations in lung volumes
• adjustments in respiratory mechanics