The correct option is (c) 2 and 3 only.
Explanation
Living organisms exhibit specific responses to environmental stimuli such as light, touch, and temperature. These responses manifest as movements, which can be directional (tropic or tactic) or non-directional (nastic).
Statement 1 is Incorrect:
Cockroaches are nocturnal insects and exhibit negative phototaxis, meaning they move away from bright light. They prefer dark, warm, and humid places to hide from predators and conserve water. The statement that they are attracted to bright light is factually wrong.
Statement 2 is Correct:
This phenomenon is known as Nyctinasty or "sleep movements." The flowers of certain plants (e.g., water lily, dandelion) close after sunset or in response to darkness (photonasty) and temperature drops (thermonasty). This helps protect pollen and reduce heat loss.
Statement 3 is Correct:
The Mimosa pudica (sensitive plant) exhibits Thigmonasty (or Seismonasty). When the leaves are touched, a rapid change in turgor pressure within the cells of the pulvinus (at the leaf base) causes the leaflets to fold and droop instantly.
Key Takeaway:
While plants exhibit nastic movements (non-directional responses like folding leaves or closing flowers), nocturnal animals like cockroaches typically show negative phototaxis (avoidance of light) as a survival mechanism.