Which of the following is not a transmitable character in plants

1. Analyze the question The question asks which character is not transmissible (heritable) in plants. "Transmissible" here means passed from parent to offspring through genes.

2. Explain the concept Heritable characters are controlled by genes and are passed from one generation to the next. In plants, examples include:

• Habit of growth (climber, erect, creeping), which is genetically determined
• Resistance to environmental factors, such as drought or disease resistance, which is often genetically controlled
• Life span (annual, biennial, perennial), which is a genetic trait

Haemophilia is a blood-clotting disorder. It is a sex-linked recessive condition carried on the X chromosome in humans and some other animals. Plants have no blood and no blood-clotting system, so they cannot have haemophilia.

3. Step-by-step solution

• Option A: Habit of growth is genetic, so it is transmissible in plants.
• Option B: Resistance to environmental factors is genetic, so it is transmissible.
• Option C: Life span is genetic, so it is transmissible.
• Option D: Haemophilia occurs only in animals with blood, so it is not a character found in plants at all.

4. Answer The correct option is D. Haemophilia.

5. Exam tip When you see a disease or trait in a "which is not found in plants" question, check whether it belongs to humans or animals. Haemophilia, colour blindness and sickle cell anaemia are classic human genetic examples, so they are usually the odd one out in plant-genetics questions.