Explanation

Bayer's test (using dilute potassium permanganate) detects the presence of C=C double bonds in alkenes.

A positive test results in decolorization of the purple KMnO₄ solution.

Explanation

Transmission means sending or passing on data or signals.

The opposite (antonym) is Hold, which means to keep or retain without sending.

Transmission means ڈیٹا یا سگنل بھیجنا یا پاس کرنا

Hold means بھیجے بغیر رکھنا یا برقرار رکھنا

Explanation

The smallpox vaccine (1796) by Edward Jenner and rabies vaccine (1885) by Louis Pasteur were key biotech advances before the 20th century.

DNA structure was discovered later in the mid-20th century.

Artificial sweeteners also post-date that era.

Explanation

Benjamin Bloom described teaching as a tri-polar process involving teacher, student, and content.

It emphasizes the interaction between all three elements for effective learning.

Explanation

مکتوب عربی زبان کا لفظ ہے، جس کا مطلب ہے لکھا گیا، اور عام طور پر اس سے مراد خط لیا جاتا ہے۔

مکتوب رسمی یا غیر رسمی پیغام رسانی کے لیے استعمال ہوتا ہے۔

Explanation

A solution is a homogeneous mixture where one substance (solute) is completely dissolved in another (solvent).

Sea water: A true solution where salts (like NaCl) are completely dissolved in water.

Explanation

Fehling's test is used to identify aldehydes by producing a red precipitate.

Aldehydes reduce Fehling’s solution, unlike ketones.

Explanation

The capsule is a protective, gelatinous layer outside the bacterial cell wall.

It helps bacteria avoid phagocytosis and enhances their ability to cause disease.

Explanation

1. Sodium (Na)
2. Hydrogen (H)
3. Carbon (C)
4. Oxygen (O)

Explanation

Hyaline cartilage provides smooth surfaces for movement at joints and supports respiratory structures like the nose, trachea, and bronchi.

It is the most common type of cartilage and appears glassy under the microscope due to its fine collagen fibers.