Which type of plastid stores starch? MCQ with Answer and Explanation

Explanation:
In DNA, guanine (G) pairs with cytosine (C) via three hydrogen bonds. Adenine pairs with thymine (two bonds). Uracil replaces thymine in RNA. Complementary base pairing is key to DNA structure and replication.

Explanation:
Seed dispersal spreads seeds away from the parent plant, reducing competition for light, water, nutrients, and space. It also aids in colonization of new habitats and increases species distribution. Dispersal agents include wind, water, animals, and explosive mechanisms. Overcrowding would lead to resource limitation. Genetic diversity is promoted by cross-pollination, not directly by dispersal.

Explanation:
A biological species is defined as a group of potentially interbreeding natural populations that are reproductively isolated from other such groups and produce fertile offspring. Physical similarity or shared habitat does not guarantee species status, as reproductive isolation is the key criterion.