The root system primarily anchors the plant and absorbs water and nutrients from the soil.

Sepals protect the flower bud before it opens and can also support the petals.

Oxygen is the main gas that is taken in during respiration and is essential for cellular metabolism.

The main goal of conservation biology is to protect endangered species and their habitats.

Family planning allows couples to make informed decisions about the number and spacing of their children, promoting reproductive health.

Sustainable development aims to meet the needs of the present without compromising the ability of future generations to meet their own needs, balancing economic growth with environmental protection.

HIV is primarily transmitted through sexual contact.

Birds and reptiles primarily excrete uric acid, which is less toxic and conserves water compared to urea.

Family planning enables couples to make informed decisions about the number and spacing of their children.

The main purpose of reproduction is to ensure the survival of a species by producing new individuals.

The main purpose of respiration in plants is to release energy from glucose, which is essential for various cellular processes.

The acrosome contains enzymes that help the sperm penetrate the outer layers of the egg during fertilization.

The G1 phase is primarily for cell growth and preparation for DNA synthesis.

The main purpose of the menstrual cycle is to prepare the female body for potential pregnancy each month.

The S phase is specifically for DNA replication, ensuring that each daughter cell receives a complete set of chromosomes.

Genetically modified crops are primarily developed to improve resistance to diseases, pests, and environmental conditions.

The main reproductive structure of angiosperms is the flower, which facilitates reproduction through pollination.

Chlorofluorocarbons (CFCs) are the primary substances responsible for ozone layer depletion.

Chlorofluorocarbons (CFCs) are the primary substances responsible for the depletion of the ozone layer.

Glucose is the main substrate for respiration in plants, as it is broken down to release energy.

Malaria is primarily transmitted by the female Anopheles mosquito.

Malaria is primarily transmitted through the bite of infected female Anopheles mosquitoes.

The male gamete in flowering plants is called pollen, which is produced in the anthers of the stamen.

The male reproductive part of a flower is called the stamen, which consists of the anther and filament. The anther is the part that produces pollen.

Nucleotides are the monomers that make up nucleic acids.

The net gain of ATP molecules from one molecule of glucose during aerobic respiration is approximately 30-32 ATP.

The normal pH range of human blood is tightly regulated between 7.35 and 7.45, which is essential for proper physiological function.

The normal pH range of human urine is typically between 6.0 and 7.0, indicating it is slightly acidic.

The normal respiratory rate for a healthy adult at rest is typically between 12 to 20 breaths per minute.

The outermost layer of a plant stem is called the epidermis, which protects the plant from environmental damage.