Explanation

A foreign key is used to link two tables and can contain duplicate values.

In contrast, primary, candidate, and even secondary keys are typically unique.

Explanation

LiAlH₄ is a strong reducing agent that effectively reduces carboxylic acids to primary alcohols.

NaBH₄ is weaker and typically reduces aldehydes and ketones.

Explanation

IQR measures the spread of the middle 50% of the data.

It is calculated as:

  IQR = Q3 – Q1

Explanation

Let u = 5x, du/dx = 5, du = 5dx, dx = du/5

∫sin5xdx = (1/5)∫sinu du

= (1/5)(-cosu) + c

= -1/5cos5x + c

Explanation

In a stationary wave, the particle velocity at a node is zero.

Nodes are points of zero displacement in a stationary wave, and therefore, they do not oscillate and have no velocity. 

Explanation

REPRESSED  "دبایا ہوا" یا "روکا ہوا"

Chocked  گھٹن زدہ

Explanation

The hormone that suppresses ovulation is progesterone. 

Progesterone, particularly high levels during pregnancy, prevents ovulation by inhibiting follicular development and providing negative feedback to the hypothalamus, reducing the release of gonadotropin-releasing hormone (GnRH). 

Explanation

The fish heart is a two-chambered organ (one atrium and one ventricle) that only receives deoxygenated blood from the body.

This blood is then pumped to the gills for oxygenation before circulating to the rest of the body.

Explanation

Apoptosis is a programmed and controlled process of cell death, essential for development and removing damaged cells.

It involves a series of biochemical events leading to cell shrinkage, DNA fragmentation, and eventual removal without causing inflammation.

Explanation

Pellicle is a flexible outer covering found in ciliates (like Paramecium) that provides shape and protection.

It is not as rigid as a cell wall and allows movement while maintaining structural integrity.