Science teachers need to ask more divergent questions because
a. it stimulates and develops critical thinking.
b. it directs students to correct answers.
c. it helps develop thinking strategies
d. it helps in assessing creative behaviour in a learner.

The correct answer is option a, c, d.

Divergent questions are open-ended questions that encourage students to think broadly, explore multiple possibilities, and come up with creative or alternative solutions rather than just recalling a single correct fact (which is characteristic of convergent questions).

Let us analyze each statement regarding why science teachers need to ask more divergent questions:

a. It stimulates and develops critical thinking:
Divergent questions require students to analyze, evaluate, and synthesize information rather than giving memorized responses. This process actively stimulates and develops critical thinking skills.

b. It directs students to correct answers:
Directing students toward a single correct answer is a feature of convergent questions, not divergent questions. Divergent questioning aims to explore multiple perspectives rather than converging on one fixed answer.

c. It helps develop thinking strategies:
By asking open-ended questions, students learn to approach problems from different angles, construct logical arguments, and refine their overall cognitive and problem-solving strategies.

d. It helps in assessing creative behaviour in a learner:
Since divergent questions allow for varied and original responses, they give teachers insight into a student's creativity, originality, and innovative thinking capabilities.

Therefore, statements a, c, and d are correct, making a, c, d the appropriate choice.