Which cannot be explained by Lamarckism?

The correct option is C

Weak progeny of a noble laureate

The correct option is C:

Explanation of the correct option:

1. Weak progeny of a noble laureate cannot be explained by Lamarckism.
2. The formation of weak progeny is not associated with any physical and mental changes that happened in the lifespan of the Noble laureate. The cause of weakness can be a certain type of deficiency in the progeny.

Explanation of the incorrect options:

Options A and B

Lamarckism:

1. Jean-Baptiste de Monet Lamarck proposed Lamarckism in the years 1744-1829.
2. This theory was founded based on the idea that all physical changes that occur in an individual during their lifespan are passed down to their successive generations.

Examples that support Lamarckism:

1. Development of an organ when used multiple times.
2. Presence of webbed toes in aquatic birds.
3. Loss of tails by humans.
4. Elongation of the neck in giraffe.

Final answer: Weak progeny of a noble laureate cannot be explained by Lamarckism.