Explanation

• The notochord is a flexible, rod-shaped structure that is present during the embryonic stage of all chordates
• It provides support and defines the primitive axis of the body.
• This characteristic is a key feature that distinguishes chordates from non-chordates.

Last verified on 06-11-2026

Explanation

Explanation

• Whales are marine mammals (Mammalia).
• It belonging to the order Cetacea.
• This also includes dolphins and porpoises.
• They breathe air, give birth to live young, and produce milk to feed their offspring, like all mammals.

Last verified on 06-11-2026

Explanation

• Spirogyra, Volvox, and Chlamydomonas are all types of algae.
• They are simple, photosynthetic organisms.
• They belong to the Kingdom Protista.
• They are commonly found in freshwater environments.

Last verified on 06-11-2026

Explanation

• During the daytime, plants require Carbon Dioxide (CO2) for photosynthesis.
• Which is the process by which they produce glucose and oxygen.

Last updated by NA on 05-11-2026

Explanation

• Mars is known as the Red Planet due to its reddish appearance.
• Its surface contains iron oxide (rust) which gives it a red color.
• It is the 4th planet from the Sun in the solar system.
• Mars has two small moons: Phobos and Deimos.
• Mars is often called the “planet of future exploration”.

Last updated by NA on 05-11-2026

Explanation

• Stayed for 14 days at Quba during the migration to Madinah in 1 AH (622 CE).
• Stayed at the house of Hazrat Kulthum bin al-Hidm (رضي الله عنه).
• Laid the foundation of Masjid Quba, the first mosque in Islam.

Last updated by NA on 05-11-2026

Explanation

• Wilhelm Conrad Rontgen discovered X-rays
• He was discovered on 8 November 1895.
• He got the Nobel Prize in Physics in 1901.

Additional questions

• The penetrating power of X-rays depends on their frequency

Last updated by NA on 05-11-2026

Explanation

• Inventors: Montgolfier brothers (Joseph-Michel and Jacques-Étienne).
• First public demonstration: 4 June 1783, Annonay, France.
• First passenger flight: 1783, near Paris.
• Known as: Pioneers of human flight.

Last updated by NA on 04-11-2026

Explanation

• The average distance from the Earth to the Sun is approximately 150 million kilometers.
• It is also called 1 astronomical unit (or AU).

Last updated by NA on 04-11-2026