Question

One day, you go outside and see that the cars on the street are covered in a yellow dust. Which of the following statements can be correctly applied to this"dust"? A) The dust is pine pollen and is so abundant because the pines are wind pollinated. B) The dust is the spore production of ferns and is so abundant because the spores are wind dispersed C) The dust is the seed production of ferns and is so abundant because the seeds are tiny and take very little energy to produce. D) The dust is the seed production of pines and is so abundant because the seeds are tiny and the very little energy to produce. e spore produs o abundant bens dust"? 35) The closest relatives of the familiar pine and spruce trees are A) ferns, horsetails, lycophytes, and club mosses B) hornworts, liverworts, and mosses C) gnetophytes, cycads, and ginkgos D) elms, maples, and aspens any mammals have skins and mucous membranes that are sensitive to phenolie secret like poison oak (Rhus). These secondary compounds are primarily adaptations that A) favor pollination decrease competition B) foster seed dispersal D) inhib herbivory Use the following information to answer questions 37-39. In onions (Allium), cells of the sporophyte have 16 chromosomes within each nudeus. Match the number of chromosomes present in each of the following onion tissues. 37) How many chromosomes should be in a pollen tube cell nudeus? A) 8 C) 24 B) 16 D) 32 many chromt in each of the forte have 16 chrome 38) How many chromosomes should be in the nudeus of an ete within the embryo sac prior to fertilization? A) 8 B) 16 024 D) 32 39) How many chromosomes should be in an embryo nucleus after fertilization? A) 8 B) 16 924 D) 32 40) Compared to animal-pollinated plants, wind-pollinated angiosperms A) produce fewer seeds because winds disperse seeds in a targeted manner B) produce more seeds because winds disperse seeds greater distances C) produce much less pollen because winds disperse pollen in a highly targeted manner D) produce much more pollen because winds disperse pollen randomly 41) Onion leaves have been modified for the purpose of A) defense (protect from predators) B) storage support D) reproduction

Answer 1

Ans- 34 A) the yellow dust is pine pollen and is so abundant because the pines are wind pollinated.

Pollination is done by several methods in plants. This could be done by either wind, animals or water. Pollination of pollen grains from anthers of one pine plant is mediated by wind and these pollens are then transferred to the stigma of the female part of the pine plant. So the dust is pine pollen and they are dispersed by wind.

Ans- 35 C)gnetophytes, cycads and ginkgos.

These are the closest relative of pines because they have more common ancestory shared among themselves. Closest relative can also be determined on the basis of molecular similarity among them. In both of the plants, there is quite similar number of cotyledons and these remain within the seed .

Ans-36 D) inhibit herbivory

These skin and mucous membranes which are sensitive to phenolics secretion by plants help the mammals in identification of edible plant from that of non edible ones. They tend to avoid such plants .

Ans- 37) A) 8

Since number of chromosome in sporophyte is 16 and it is diploid in nature.

16 chromosome=2n

n=8 chromosomes.

Pollen tube cell Nucleus is haploid (n).

So it has n=8 chromosomes.

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