Consider the following statements about the nervous system: 1. The central nervous system consists of the brain and spinal cord. 2. The peripheral nervous system includes cranial and spinal nerves. 3. The autonomic nervous system controls voluntary actions. Which of the above is/are correct? MCQ with Answer and Explanation

Explanation:
Double fertilization involves one male gamete fusing with the egg cell to form a diploid zygote, and the second male gamete fusing with the two polar nuclei (central cell) to form a triploid primary endosperm nucleus. The endosperm provides nutrition to the developing embryo. This unique feature ensures efficient nutrient supply and is typical of angiosperms.

Explanation:
The pyloric sphincter is a ring of smooth muscle at the junction of the stomach and duodenum. It controls the release of chyme from the stomach into the small intestine in small amounts. The cardiac sphincter is between the esophagus and stomach, ileocecal valve between small and large intestine.

Explanation:
Carbohydrates are the body's primary and most readily available source of energy, broken down into glucose for immediate cellular use. Proteins are essential 'body-building' foods, providing amino acids necessary for the growth, repair, and maintenance of tissues, muscles, and enzymes. Fats are essential macronutrients; they provide concentrated energy, are crucial for cell membrane structure, aid in the absorption of fat-soluble vitamins, and provide essential fatty acids. Thus, statements 1 and 2 are correct.