Question

Which of the following statements regarding noncyclic electron flow (the Z-scheme model) and cyclic electron flow are correct?

	a.	Plastocyanin serves as an electron donor to P700 pigments in photosystem I in both noncylic and cyclic electron flow
	b.	Water serves as an electron donor to P680 pigments in photosystem II in both noncylic and cyclic electron flow
	c.	ATP is produced on both noncylic and cyclic electron flow
	d.	NADPH is not produced in cyclic electron flow
	e.	All of the above are true

1. Wind erosion and deforestation is harmful to soil health because it:

   	a.	Destroys the humus, which has a high density of organic compounds
   	b.	Increases the nitrogen content of the soil
   	c.	Creates a balance of sand, silt, and clay
   	d.	Increases humus formation
   	e.	Allows for organisms such as nematodes, fungi, and bacteria to grow

2. The zone of cellular maturation contains:

   	a.	The root cap and root hairs
   	b.	Cells that are recently derived from primary meristematic tissues
   	c.	Older, differentiated cells of the dermal, vascular, and ground tissue
   	d.	The protoderm, ground meristem, and procambrium
   	e.	The apical meristem

Answer 1

Answer 1:

Option e - all of the above statements are true.

All the statements given about cyclic and non-cyclic electron flow are correct. ATP is produced in both these processes; NADPH is not produced in cyclic electron flow... etc.

Answer 2:

Option a - Destroys the Humus, which has a high density of organic compounds.

Humus is the organic component of soil which is made of decomposed plants.  It  is important for proper plant nutrition and development. It is present in the top soil so deforestation and soil erosion affect it first as compared to the layers beneath.

Answer 3:

Option c - Older, differentiated cells of the dermal, vascular, and ground tissue

The zone of maturation is present after the zone of elongation and the meristematic zone. The meristematic zone has cells that are constantly dividing and hence new cells are formed. this cells undergo elongation forming the zone of elongation and finally once they become differentiated in the zone of maturation, they lose their ability to divide and form the cells of dermal, vascular and ground tissue.