Explanation

Active transport moves molecules against the concentration gradient, which requires energy (ATP).

Passive transport and facilitated (not vacillated) transport do not require energy.

Explanation

The word zoology comes from the Greek words "zoon" (meaning animal) and "logos" (meaning study).

So, zoology means the study of animals in Greek origin.

Explanation

The cross product (A × B) is a vector whose magnitude is given by:

| A × B | = |A||B| sinθ

Its direction follows the right-hand rule.

Explanation

Work, mass and distance are scalar quantities because they have magnitude but no direction, but they are not vector quantities.

Vector Quantities: Velocity, momentum, torque, acceleration, weight, displacement.

Scalar Quantities: Work, distance, speed, mass.

Explanation

The cross product of two vectors A × B ≠ B × A; in fact, A × B = –(B × A), so it is not commutative.

However, it does obey the distributive law over addition, and associative law applies with scalar multiplication but not for three vector cross products.

Explanation

Nitrogen gas (N₂) has a triple covalent bond between the two nitrogen atoms.

This triple bond makes N₂ very stable and unreactive under normal conditions.

Explanation

Gas: No definite shape or volume – Expands to fill any container.

Example: Oxygen, CO₂.

Solid: Fixed shape and volume (e.g., iron).

Liquid: Fixed volume, no fixed shape (e.g., water).

Explanation

Sum = 4 + 5 + 6 + 8 + 12 = 35

Average = 35 ÷ 5 = 7

Explanation

The sum of two odd integers (e.g., 3 + 5) is always an even number (e.g., 8).

That’s because odd + odd = even.

Explanation

Step 1: Understand the problem

The problem asks for the product of √-2 × √-2.

Step 2: Calculate the product

√-2 × √-2 = (√-1 × √2) × (√-1 × √2)

= (√-1)² × (√2)²

= i² × 2

= -1 × 2

= -2