Option- 1: Both the statements are individually true and Statement II is the correct explanation of Statement I.

This means that both Statement I and Statement II are true, and Statement II provides a correct explanation for Statement I.

Statement I states that in Tundra climate, biodiversity is comparatively less. This means that the number and variety of species found in the Tundra climate are lower compared to other climates. This statement is generally true as Tundra climates are characterized by extremely cold temperatures, short growing seasons, and permafrost, which limits the availability of resources for plants and animals, resulting in lower biodiversity.

Statement II states that Tundra climate has less reproductive warm period. This means that the warm period in the Tundra climate, which is the time suitable for reproduction and growth, is shorter compared to other climates. This statement is also true as Tundra climates have very short summers, during which the temperatures rise enough for plant growth and reproductive activities to occur. The rest of the year is characterized by freezing temperatures, making it difficult for plants and animals to reproduce.

Therefore, both statements are true, and Statement II correctly explains why biodiversity is comparatively less in the Tundra climate.