During fertilization, two germ cells combine, and each contributes one chromosome from each pair. This process restores the diploid number of chromosomes in the progeny, ensuring the stability of the species’ DNA and maintaining genetic integrity.
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Having two copies of each chromosome in germ cells ensures genetic diversity and allows for independent assortment during meiosis. It also enables the restoration of the normal number of chromosomes in the progeny when germ cells combine during fertilization.
The cutting of a mature crop is called harvesting. A cereal crop usually takes 3 to 4 months to mature. NCERT Class 8 Science Chapter 1 Crop Production and Management
Weedicides are chemicals, like 2,4-D, used to control weeds. They are diluted with water and sprayed in fields during the vegetative growth of weeds, ensuring minimal impact on crops. NCERT Class 8 Science Chapter 1 Crop Production and Management
The brain enables voluntary actions by sending messages to muscles. The peripheral nervous system, consisting of cranial and spinal nerves, facilitates communication between the central nervous system and other body parts.