tip and trick biology

 

Q3: Mitosis – which phase has chromosomes lined up in the middle?

• You answered: A) Prophase

• Correct answer: B) Metaphase

• 🔑 Trick: Meta = Middle. Chromosomes line up in the middle of the cell during metaphase.

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❌ Q4: Which system transports hormones in the body?

• You answered: A) Lymphatic system

• Correct answer: C) Circulatory system

• 🔑 Trick: Endocrine system makes hormones, Circulatory system moves them through blood.

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❌ Q5: What happens to diaphragm during inhalation?

• You answered: C) Contracts and moves upward

• Correct answer: A) Contracts and moves downward

• 🔑 Trick: Inhale = chest expands = diaphragm pushes down to make space for lungs.

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❌ Q6: Which RNA carries amino acids to ribosome?

• You answered: A) mRNA

• Correct answer: B) tRNA

• 🔑 Trick:

  • mRNA = message (code from DNA)

  • tRNA = transfer (carries amino acids)

  • rRNA = ribosome (structure)

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❌ Q10: Two heterozygous parents (Rr × Rr) — probability child has disorder?

• You answered: B) 50%

• Correct answer: A) 25%

• 🔑 Trick: Punnett square:

  • RR = 25% (healthy)

  • Rr = 50% (carrier)

  • rr = 25% (disorder)