All Free Biology MCQs with Answers

• A. 10
• B. 20
• C. 30
• D. 400

Explanation: Explanation for this question will be added soon.

• A. Voice deepens
• B. Pubic hair growth
• C. Hips broadens
• D. Start of menstrual cycle

Explanation: Explanation for this question will be added soon.

• A. LTH
• B. Lactogen
• C. Placenta
• D. All of these

Explanation: Explanation for this question will be added soon.

• A. Ovary
• B. Ureters
• C. Abdomen
• D. None of these

Explanation: The uterine tubes (or fallopian tubes, oviducts, salpinx) are muscular 'J-shaped' tubes, found in the female reproductive tract.

• A. Endometrium
• B. Perimetrium
• C. Corpus luteum
• D. None of these

Explanation: Explanation for this question will be added soon.

• A. Placenta
• B. Birth canal
• C. Cervix
• D. All of these

Explanation: The uterus of the female reproductive system opens into the vagina. Vagina is a part of the birth canal and is connected to the uterus via…

• A. As most sports magazines can attest, playing sports such as tennis and basketball require not only mental ability but also physical strength.
• B. As most sports magazines can attest, playing sports such as tennis and basketball requires not only mental ability but also physical strength.
• C. As most sports magazines can attest, playing sports such as tennis and basketball requires not only mental ability but also physically strength.
• D. As most sports magazines can attests, playing sports such as tennis and basketball requires not only mental ability but also physical strength.

Explanation: As most sports magazines can attest, playing sports such as tennis and basketball requires not only mental ability but also physical…

• A. Relaxes and domes up
• B. Contracts and flattens
• C. Remains unchanged
• D. Contracts and domes up

Explanation: During inspiration, the diaphragm contracts and flattens, increasing thoracic volume and drawing air in.

• A. Histoplasmosis
• B. Tuberculosis
• C. Cystic Fibrosis
• D. None of these

Explanation: None of the given options are correct.. Cystic fibrosis is a disorder that damages your lungs, digestive tract, and other organs.

• A. The relaxation of the muscles of the diaphragm
• B. Relaxation of the external intercostal muscles
• C. Increased pressure
• D. The contraction of the muscles of the diaphragm

Explanation: Option A occurs during expiration, as the diaphragm's muscles relax, causing the chest cavity space to decrease and the air is pushed…

• A. Contracts
• B. Relaxes
• C. Contracts and relaxes
• D. None of these options is correct

Explanation: Inspiration is the first phase of breathing, in which we inhale air.

• A. Lungs pull air inside
• B. Passive transport of air takes place
• C. Active expansion of lungs takes place
• D. Air is pushed inside

Explanation: During inspiration active expansion of air occurs and expiration is due to a passive contraction due to the elasticity of the lungs.

• A. 3.5 litres
• B. 2.5 litres
• C. 5 litres
• D. 10 litres

Explanation: When the lungs are fully inflated, the total lung capacity in liters for an average adult human is around 5 liters.

• A. As Bicarbonate ions
• B. In the form of dissolved gas molecules
• C. By binding to R.B.C
• D. As Carbaminohaemoglobin.

Explanation: (a) : About 70% of CO2 (about 2.5ml per 100 ml. of blood), received by blood from the tissues, enters the RBCs where it reacts with water…

• A. Passive transport
• B. Active transport
• C. Simple diffusion.
• D. Both A and C

Explanation: All options are explained below: Option D is correct. a)The exchange of gases in the alveoli of the lungs takes place by Passive…

• A. Nonciliated columnar
• B. Nonciliated squamous
• C. Ciliated columnar
• D. Ciliated squamous.

Explanation: All options are explained below: a) Nonciliated Columnar:Nonciliated columnar epithelium is not the primary type of epithelium found in…

• A. Pleural membrane
• B. Myocardium
• C. Pericardium
• D. Both B and C

Explanation: "The explanation for this question will be added soon!".

• A. 2
• B. 4
• C. 3
• D. 5

Explanation: There are two types: 1.Acute bronchitis. This is more common. Symptoms last a few weeks, but it doesn't usually cause problems past that…

• A. R.B.C
• B. Parabronchi
• C. Pleura
• D. None of these

Explanation: An enzyme present in red blood cells, carbonic anhydrase, aids in the conversion of carbon dioxide to carbonic acid and bicarbonate ions.

• A. Bronchi
• B. Mucus
• C. Pharynx
• D. Glottis

Explanation: Mucus in the nasal cavity captures all the dirt and bacteria and is responsible for moisture amd warmth in the nasal cavity