Medical Terminology

Identifying the role of Rennin in infants. Rennin, also known as chymosin, is crucial for infants as it helps in the coagulation of milk, making it easier to digest. It acts on the milk protein casein, turning it into curds. Infants who lack sufficient rennin may experience indigestion when consuming milk because they cannot effectively process the proteins found in it.

Let's evaluate the given options one by one: 1. Lippe's loop: This is a type of intrauterine device (IUD) and is used for birth control. Correct. 2. Vaults: This is not a recognized type of IUD. It is not used for contraception and does not fall under IUD classification. Incorrect. 3. Multiload 375: This is a type of intrauterine device. It is commonly used for contraception and is recognized in IUD classifications. Correct. 4. LNG-20: This is a type of intrauterine system (IUS) containing the hormone levonorgestrel, used as a contraceptive device. Correct. 5. Diaphragms: Diaphragms are barrier methods of contraception and are not IUDs. Incorrect. Thus, the correct intrauterine devices are A (Lippe's loop), C (Multiload 375), D (LNG-20). The correct answer is Option B.

The answer is (2) Cannabinoids. Explanation:
Cannabinoids: These are substances derived from the cannabis plant. They can have performance-enhancing effects (e.g., reducing anxiety, altering perception of time) and are sometimes misused by athletes.
While other options might be misused in general, their effects are not typically associated with performance enhancement in sports:
Opioids: Primarily used for pain relief.
Coca alkaloids: Stimulants like cocaine can enhance performance but are not the primary focus of the question.
Snack: Not a drug.
Therefore, Cannabinoids are the most relevant drugs misused by sportspeople for potential performance enhancement.

The adrenal cortex is a vital gland that produces important hormones like cortisol, aldosterone, and androgens. Removal or dysfunction of the adrenal cortex leads to a condition known as Addison's disease, which can be fatal if untreated due to the lack of these critical hormones.

The testis produces testosterone and sperm, but its removal doesn't lead directly to death, though it can cause infertility.

The thyroid gland regulates metabolism through thyroid hormones. Although its removal leads to hypothyroidism, it is not immediately fatal as the condition can be managed with hormone replacement therapy.

The thymus gland is important for immune system development, especially in early life, but its removal does not directly result in death.

Conclusion: The removal of the adrenal cortex leads to death if not managed, which makes Option A the correct answer.

The correct statement is Option (C): Nitrogen is very less in living organisms.

Explanation:

• Option (A) – Incorrect: The atmosphere contains only about 0.03% of CO₂, not 90%.
• Option (B) – Incorrect: While CO₂ is present in oceans, it does not make up 90% of the Earth's CO₂ content.
• Option (C) – Correct: Nitrogen, although the most abundant gas in the atmosphere (78%), is present in living organisms in small amounts because it is not readily used in its gaseous form. It needs to be fixed into a usable form (like ammonia) by certain bacteria for incorporation into proteins and nucleic acids.
• Option (D) – Incorrect: The phosphorus cycle is an example of a sedimentary cycle, involving the movement of phosphorus through rocks, water, and living organisms, but it is not directly atmospheric like other cycles.
• Option (E) – Incorrect: The burning of fossil fuels does increase CO₂ in the atmosphere, contributing to the greenhouse effect and climate change.

Thus, the correct answer is Option (C), as nitrogen is indeed present in lower amounts in living organisms.

The digestive glands found in the wall of the intestine are:

• Brunner's glands: Located in the submucosa of the duodenum (the first part of the small intestine). They secrete alkaline mucus that helps neutralize the acidic content coming from the stomach into the intestine.
• Crypts of Lieberkühn: Specialized glands found in the mucosal lining of the small intestine. They secrete intestinal juices, including enzymes that aid in digestion and nutrient absorption.

Thus, the correct answer is Option (4): Brunner's glands and Crypts of Lieberkühn.

Bilaterally Symmetrical Animals and Cephalization

• Assertion (A): Bilaterally symmetrical animals are more efficient in seeking food and locating mates. (✔ True)
• Reason (R): Cephalization, the concentration of sensory organs and nerve cells in the anterior region, enhances their ability to locate food and mates. (✔ True)

Since both A and R are true, and R correctly explains A, the correct answer is (A).

Let's analyze each statement:

• Statement I: "Veins are bright red in colour and provide with wide lumen."
  This is incorrect because veins are typically darker red due to deoxygenated blood. Also, veins do not have particularly wide lumens compared to arteries.
• Statement II: "Veins are non-vascular and blood flows in veins by jerks."
  This is incorrect. Veins are vascular and carry deoxygenated blood (except pulmonary veins). Blood flow in veins is more continuous, aided by skeletal muscle contractions and the heart's pumping action, not jerks.
• Statement III: "Arteries are provided with thick tunica media."
  This is correct. Arteries have a thick tunica media (the muscular middle layer) that helps them withstand the high pressure of the blood pumped by the heart.
• Statement IV: "Veins end in capillaries and arteries start with capillaries."
  This is incorrect. Arteries start from the heart and branch into arterioles, which then lead to capillaries. Veins carry blood back to the heart and do not end in capillaries.

Thus, the correct statement is III only, and Option (C) is the correct answer.

Correct Identification of Monocondylic Skull

• Monocondylic Skull: Refers to a single occipital condyle in the skull.
• This feature is found in:
  • Pisces (Fishes)
  • Reptiles
  • Birds

Thus, the correct answer is Option (C): Pisces, reptiles, and birds.