Perihelion is the point in the orbit of a celestial body (such as a planet or comet) that is closest to the sun. Aphelion is the point in the orbit of a celestial body (such as a planet or comet) that is furthest from the sun.
Parallelism of the Earth’s axis refers to the fact that the Earth’s axis of rotation is parallel to itself over time, meaning that it does not move or wobble in relation to the planet’s orbit around the sun. This is the main factor responsible for our regular seasons.
This is because in females, the process of meiosis produces a single ovum, which contains half the number of chromosomes as the parent cell. In males, meiosis produces four sperm cells, each containing half the number of chromosomes as the parent cell. This is necessary for the male reproductive system to create a variety of …
1. Apical meristem: Found at the tips of stems and roots, this type of meristem is responsible for primary growth and increases the length of the plant. 2. Intercalary meristem: Found at the base of leaves and nodes, this type of meristem is responsible for secondary growth. 3. Lateral meristem: Found in the vascular cambium …
Different kinds of meristem – വ്യത്യസ്ത തരം മെറിസ്റ്റം Read More »
Plants: Plants grow by forming new tissues and cells through the process of cell division. Their growth is mainly determined by environmental factors such as light, temperature, and water. Plants use photosynthesis to turn sunlight into energy, which helps them grow. Animals: Animals grow by increasing in size and mass. Their growth is mainly determined …
Loss of muscle mass and strength Poor balance, reflexes, and coordination Changes in vision, hearing, and sense of smell Decreased bone density and increased risk of osteoporosis Loss of skin elasticity and thinning of the skin Increase in wrinkles and age spots Hair loss and changes in hair texture Increased risk of dental problems due …
The physical peculiarities of old age – വാർദ്ധക്യത്തിന്റെ ശാരീരിക പ്രത്യേകതകൾ Read More »
Mitosis is the process of eukaryotic cell division where the cell nucleus splits into two identical daughter nuclei. It is followed by the division of the cytoplasm and the organelles, resulting in two daughter cells. Mitosis is a continuous process, which is divided into four stages: prophase, prometaphase, metaphase, anaphase, and telophase. During prophase, the …
Characteristic of mitosis – മൈറ്റോസിസിന്റെ സവിശേഷതകൾ Read More »
Cell plate formation is a process of cell division in plant cells, which involves the formation of a new cell wall in the middle of two daughter cells. It begins when the cell membrane at the equator of the dividing cell pinches inwards, forming a vesicle known as the preprophase band. The preprophase band then …
Cytokinesis is the process in which a single cell divides into two daughter cells. It is the final stage of mitosis, the process by which replicated chromosomes are separated into two new cells. During cytokinesis, the cytoplasm of a single cell divides into two new daughter cells, a process that is necessary to maintain the …
The chromatin reticulum undergoes several changes during the process of transcription. When a gene is turned on, the chromatin fibers become less tightly wound, allowing for the transcription machinery to access the gene. During transcription, the chromatin fibers become even more unwound, allowing the transcription factors and RNA polymerase to interact with the DNA. Once …