Answer:
Medulla oblongata. (Ans. A)
Explanation:
Medulla oblongata is present in the brain, in front of the cerebellum. It controls the number of functions in the body. It helps to transfer messages to the thalamus & spinal cord, from the body.
Medulla oblongata helps to regulate breathing, blood pressure, heart rate, sneezing, and digestive activities. Medulla oblongata part of the brain is a center for respiration & circulation. Sensory & nerve cells from the midbrain & forebrain travel through the medulla. It receives its blood supply from many arteries (including anterior spinal, posterior inferior cerebellar and the vertebral artery's)
Answer:
A. Two different forms a plant can have
Explanation:
Higher plants, lower plants (mosses) and ferns undergo a life cycle called ALTERNATION OF GENERATIONS. In this life cycle, they switch between a haplontic and diplontic forms of life.
The haplontic (haploid) life form which produces haploid (n) gametes is called GAMETOPHYTE while the diplontic (diploid) life form which produces the spores that germinates is called SPOROPHYTE. Hence, sporophyte and gametophyte are two different forms a plant can have.
Answer:
Frederick Griffith's discovery on the theory of genetics is credited to his experiment on mice. He subjected them to different strains of pneumonia bacteria. He concluded that there is an unidentified force that leads to the formation of different strains from what the mice were subjected to. This leads to the discovery of DNA, the carrier of traits. Scientist before did not know how the trait is passed on not until Griffith's experiment.
Explanation:
Answer: Microorganism activity affects soil acidity and the amount of organic matter in soil. It also affects the nutrient and mineral levels in soil as well as soil structure.
Explanation:
<span> D) cloning could lead to a reduction of genetic variation</span>
