A. Very Short Answer Questions1. Name the hormone secreted by parathyroid?2. Why are roots called positively geotropic?3. What term is used for the movement of stem apex towards light?4. What is neuron?

A. Very Short Answer Questions1. Name the hormone secreted by parathyr

1.	A. Very Short Answer Questions1. Name the hormone secreted by parathyroid?2. Why are roots called positively geotropic?3. What term is used for the movement of stem apex towards light?4. What is neuron?
Answer» 1)parathyroid hormone2)This response to gravity iscalled geotropism, or gravitropism. Therootsare exhibitingpositive geotropism, or growth with gravity, while the stem is exhibiting negativegeotropism, or growth against gravity. Different parts of a plant grow in opposite directions because they have different functions.3)phototropism4)a specialized cell transmitting nerve impulses; a nerve cell