Which of the following statements about the food web is correct? MCQ with Answer and Explanation

Explanation:
Lateral meristems—vascular cambium and cork cambium—are responsible for secondary growth, increasing the girth (diameter) of dicot stems and roots. Apical meristem at root and shoot tips causes primary growth in length. Intercalary meristem at nodes helps in elongation in grasses. Epidermis is a protective outer layer. Secondary growth is absent in most monocots due to lack of vascular cambium.

Explanation:
The four pulmonary veins drain oxygen-rich blood from the lungs into the left atrium. The pulmonary artery carries deoxygenated blood from right ventricle to lungs. Vena cava brings deoxygenated blood to right atrium.

Explanation:
The medulla oblongata, part of the brainstem, contains vital centers that control respiration, heart rate, and blood pressure. It also regulates reflex actions like coughing, swallowing, and vomiting. The cerebrum is for voluntary actions and thinking, cerebellum for coordination, and hypothalamus for homeostasis and endocrine control.