Which row shows the correct labels on the diagram of a leaf section?

Correct Answer: A

Rationale: The correct answer is A because the cuticle is the waxy layer on the leaf surface, palisade mesophyll is the layer of elongated cells where photosynthesis occurs, and stoma is the opening for gas exchange. Epidermis is the outer layer, not the cuticle. Spongy mesophyll is below palisade mesophyll, not above it. Guard cells surround stomata, not spongy mesophyll.

Correct Answer: C

Rationale: The correct equation for calculating power is P = ΔE / t. Power is defined as the rate at which work is done or energy is transferred. In this equation, ΔE represents the change in energy and t represents the time taken for that change. Dividing the change in energy by the time gives us the power. This equation aligns with the fundamental definition of power. Choice A (P = ΔE × t) is incorrect because it implies that power is directly proportional to both the change in energy and time, which is not always the case. Choice B (P = W × t) is incorrect because it incorrectly uses work (W) in the equation for power, while power is specifically related to the rate at which work is done, not the work itself. Choice D (P = W / ΔE) is incorrect because it suggests power is inversely proportional to the change in energy, which is not a characteristic of power.

Correct Answer: B

Rationale: The correct answer is B: humoral stimuli. Parathyroid hormone secretion is regulated by the concentration of calcium in the blood, which is an example of humoral stimuli. When blood calcium levels decrease, parathyroid hormone is released to increase calcium levels. Pituitary gland stimuli (A), neural stimuli (C), and hormonal stimuli (D) are not directly involved in the regulation of parathyroid hormone secretion.

Correct Answer: A

Rationale: The correct answer is A: nervous system. The nervous system can directly override normal endocrine controls through the release of neurotransmitters that can stimulate or inhibit hormone release from endocrine glands. The nervous system can rapidly respond to immediate changes in the internal or external environment, allowing for quick adjustments in hormone levels. Summary of why the other choices are incorrect: B: The circulatory system is not involved in directly overriding endocrine controls. C: The digestive system primarily regulates the breakdown and absorption of nutrients, not endocrine controls. D: The reproductive system is responsible for the production of sex hormones and gametes, but it does not directly override normal endocrine controls.

Correct Answer: D

Rationale: Step-by-step rationale: 1. The inferior thyroid artery typically arises from the thyrocervical trunk. 2. The thyrocervical trunk is a branch of the subclavian artery. 3. This artery supplies blood to the thyroid gland. 4. The external carotid artery and internal carotid artery do not give rise to the inferior thyroid artery. 5. The brachiocephalic trunk does not directly supply blood to the thyroid gland. In conclusion, the correct answer is D because the thyrocervical trunk is the main artery that gives rise to the inferior thyroid artery, providing blood supply to the thyroid gland.