Biology in Class 10 : Practice MCQ Questions & Answers with Explanations

The spinal cord is part of the central nervous system that acts as a communication highway, transmitting nerve signals between the brain and the rest of the body while also coordinating reflex actions.

Vegetative propagation is an asexual reproduction method where a new plant grows from parts such as stems, roots, or leaves, commonly seen in plants like rose or money plant.

The fallopian tubes connect the ovaries to the uterus. They transport eggs and are the site of fertilization, where sperm meets the egg.

Mendel used pea plants to study the inheritance of traits because of their distinct characteristics and ease of cultivation.

Removing a top predator leads to prey overpopulation, which can deplete primary producers and destabilize the ecosystem, affecting the entire food chain.

Alleles are variations of a gene located at the same position on homologous chromosomes. These variations can result in different traits, such as flower color or eye color.

The anther is a part of the stamen in flowers, containing pollen grains that produce male gametes (sperm cells) for reproduction.

The myelin sheath is a fatty layer surrounding the axon of a neuron. It insulates the axon and significantly increases the speed of electrical impulse transmission.

ATP (Adenosine Triphosphate) stores and releases energy for various cellular activities, making it the primary energy currency in living organisms.

Food webs consist of interconnected food chains, offering multiple pathways for energy transfer. This redundancy increases ecosystem stability compared to the linear structure of a food chain.

The F2 generation of a dihybrid cross follows the phenotypic ratio 9:3:3:1, representing the combinations of dominant and recessive traits across two genes.

Anaerobic respiration does not produce water; instead, it forms ethanol or lactic acid.

Guard cells regulate the opening and closing of stomata to facilitate gaseous exchange.

Sunlight is the primary source of energy for all ecosystems, driving photosynthesis in plants.

DNA has a double helix structure formed by two strands coiled around each other.

Mendel's Law of Independent Assortment states that genes for different traits are inherited independently of each other.

Genes, which are segments of DNA, carry the instructions for traits and are considered the fundamental units of inheritance, determining the characteristics passed from parents to offspring.

Dendrites are branched extensions of a neuron that receive signals from other neurons and transmit them to the neuron's cell body for processing.

Biomagnification refers to the progressive increase in the concentration of toxic substances, such as pesticides or heavy metals, as they move up through the trophic levels of a food chain.

Hibiscus flowers have both male (stamens) and female (carpels) reproductive organs within the same flower, making them bisexual, unlike unisexual flowers like maize or papaya.