How many chromosomes are present in the nucleus of a sperm cell? Which of the following reactions seen in plants is an example of positive phototropism?

Here are the solutions to the questions: 1. How many chromosomes are present in the nucleus of a sperm cell? A human somatic (body) cell contains 46 chromosomes. A sperm cell is a gamete (sex cell), which is haploid, meaning it contains half the number of chromosomes of a somatic cell. (46)/(2) = 23 Therefore, a human sperm cell contains 23 chromosomes. The correct option is D. D. 23 2. Which of the following reactions seen in plants is an example of positive phototropism? Phototropism is the growth of a plant in response to light. Positive phototropism means growing towards* the light. Negative phototropism means growing away from* the light. Plant stems typically exhibit positive phototropism, growing towards a light source to maximize photosynthesis. Let's analyze the options: A. a plant root which grows away from the light: This is negative phototropism (for roots). B. a plant root which grows downwards towards gravity: This is positive geotropism. C. a plant stem which grows towards the light: This is positive phototropism. D. a plant stem which grows upwards away from gravity: This is negative geotropism. The correct option is C. C. a plant stem which grows towards the light Send me the next one 📸