Question

In: Biology

Small pores known as ________ dot the surface of the epidermis of leaves and stems; each...

Small pores known as ________ dot the surface of the epidermis of leaves and stems; each pore is bordered by two ________.

A.
stomata; guard cells

B.
stomata; fibers

C.
sieve tube elements; companion cells

D.
sclereids; guard cells

E.
cuticle; guard cells

1b

Which of the following materials is cycled and recycled within and among ecosystems?

	A.	carbon
	B.	nitrogen
	C.	phosphorus
	D.	water
	E.	All of these, plus others

c

The niche of a species is affected by which of the following factors?

	A.	availability of resources
	B.	the species’ adaptations to the environment
	C.	interspecific competition
	D.	degree of resource partitioning among similar species
	E.	All of the above may affect the niche of a species in a given environment.

d

There is a trade-off between photosynthesis and transpiration in leaves because

	A.	numerous stomatal pores provide both gas exchange for photosynthesis and openings through which water vapor escapes.
	B.	a waxy layer, the cuticle, reduces water loss.
	C.	blue light triggers an influx of potassium ions (K+) into the guard cells.
	D.	leaves of deciduous plants abscise as winter approaches in temperate climates.
	E.	stomata are closed at night, although water continues to move into the roots by osmosis.

Expert Solution

Ans. 1 - correct ans. Is - option A

Stomata are small pores present on the epidermis of leaves and stem in plants and each pore is guarded by guard cells.

Guard cells are the kidney shaped cells that surround the stomata and are responsible for opening and closing of the stomatal pore.

Ans. 2- correct ans. Is option - E(all of the above)

Carbon nitrogen and water cycle takes place within and among the ecosystem, carbon to CO2 to photosysnthesis to glucose to food and fuel to CO2.

Nitrogen we have various methods of fixation on earth itslef.

Water to vapour and vice versa, these are common within and amomg ecosystems.

Phosphorous moves from soil to water and returns back, its basically moviing between terrestrial and aquatic ecosystem.

Ans. 3- correct ans. Is option E(all of the above)

A. availability of resources - if food and water is available it will stay there.

B. the species’ adaptations to the environment - it should be able to adapt to the local environment to survive.

C. interspecific competition - more competition leads to fewer resources for some and more resources for others, adaptibility is key to survival.

D. degree of resource partitioning among similar species - it is related to food. better food in proper amount , the species settles there.

Ans. 4- correct ans. Is option A

The trade-off between photosynthesis and transpiration is because of the several stomatal pores that provide exchange of gases for photosynthesis and openings through which water vapor escapes.

If you have any doubt then mention in comment.

gladiator answered 2 years ago

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