Chapter 11
Reproduction: How Life Continues
CBSE Class 9
Science Solutions
Educart Science class Class 9 NCERT Exemplar cover
Question:

A human zygote has just formed. How many chromosomes does it have? [Pg. No. 222]

Answer: Verified

A human zygote has 46 chromosomes (23 pairs). It is formed by the fusion of a male gamete (sperm) containing 23 chromosomes and a female gamete (ovum) containing 23 chromosomes, restoring the diploid chromosome number of 46.

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More NCERT Questions
In animals, which fertilisation method the gametes are more protected? [Pg. No. 218] If a couple uses oral contraceptive pills but not condoms, which risks remain and why? [Pg. No. 223] What protective devices can be used during sexual activity to reduce the spread of STIs? [Pg. No. 223] Rina's period occurs every 28 days. Her last period was on the 5th of March. On which day is she most likely to get her next period? [Pg. No. 222]