The phenomenon of etiolation in plants is characterized by:

The correct answer is B: Elongated internodes, pale color, and reduced photosynthetic capacity. Etiolation is the adaptation to grow in darkness: shoots elongate, leaves remain pale (no chlorophyll), and seedlings appear yellowish.

What is the SI unit of magnetic flux?

The correct answer is B: Weber. The Weber (Wb) is the SI unit of magnetic flux, defined as Tesla × meter². 1 Wb = 1 T·m².

Which law states that the force of attraction between two masses is directly proportional to the product of their masses and inversely proportional to the square of the distance between them?

The correct answer is C: Newton's Law of Gravitation. Newton's Law of Universal Gravitation states F = G(m₁m₂)/r². This is the fundamental law describing gravitational attraction between masses.

A current of 5 A flows through a resistor for 10 seconds. How much charge passes through it?

The correct answer is C: 50 C. Charge Q = I × t, where I = 5 A and t = 10 s. Q = 5 × 10 = 50 Coulombs.

The phenomenon where plants lose water as liquid droplets from leaf margins is called:

The correct answer is B: Exudation. Exudation or guttation occurs when root pressure forces water out through specialized pores (hydathodes) as liquid water droplets, typically observed in early morning.

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Q.1 Hard Space & Astronomy

Which of the following statements about the Oort Cloud is incorrect?

A It is a theoretical spherical shell of icy bodies surrounding our solar system

B It extends approximately 100,000 to 200,000 AU from the Sun

C It is the primary source of long-period comets

D It has been directly observed through telescopes and contains approximately 1 trillion objects

Correct Answer: D. It has been directly observed through telescopes and contains approximately 1 trillion objects

Explanation:

The Oort Cloud remains theoretical and has never been directly observed; we infer its existence from comet trajectories and orbital studies.

While estimates suggest it contains billions to trillions of icy bodies, these objects are too distant and too small to be directly observed with current technology, making option D the incorrect statement among the given choices.

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