Question

Which of the following statement(s) is/are false?

(i) Pollen grains represent immature gametophytes.

(ii) In angiosperms, partially developed male gametophytes are pollinated.

(iii) Generative cell is siphonogamous while the vegetative cell is spermatogenous.

(iv) Formation and differentiation of pollen grains are called microsporogenesis.

(v) Pollen grains of some plants produce severe allergies and respiratory or bronchial diseases.

(vi) Pollen grains are poor in nutrients.

A. (i) and (vi)
B. (iii) and (vi)
C. (iv) and (v)
D. (v) and (vi)

Answer 1

Hint: The primary distinction between vegetative and generative cells is that the vegetative cell produces a tube cell throughout pollen development, whereas the generative cell produces two sperm cells. Since pollen grains are high in nutrients, they are utilized as food supplements. Consuming pollen is said to enhance the performance of athletes and racehorses.


Step by step solution:
Pollen is not regarded as a male gamete. It contains both non-reproductive and reproductive cells. Vegetative cells are non-reproductive cells found within pollen grains. A single vegetative cell can be observed in most flowering plants. A reproductive cell is also referred to as a generative cell. A vegetative cell is responsible for forming a pollen tube that passes through the pistil's style. A generative cell divides and splits again to form sperm cells, male gametes in flowering plants. The primary distinction between vegetative and generative cells is that the vegetative cell is not reproductive, whereas the generative cell is. So, the generative cell is spermatogenous. This contradicts statement (iii). Thus, we can say that the third statement is false.
Pollen and its nutritional value remain shrouded in mystery. It is referred to as the "only perfectly complete food." Pollen collected by bees was first used for human nutrition in modern times. Most of the vitamins found in pollen provide significant nutritional value, including provitamin A, vitamin E (tocopherol), niacin, thiamine, folic acids, and biotin. Particularly in cases where high values have been measured, whereas the content of some pollen types is lower. There is considerable variation depending on the pollen type, as with other components. Pollen contains high levels of carotenoids, primarily -carotene, which is related to vitamins. Thus, we can say that The sixth statement is false.
Hence, The correct option is B.

Note: Since the pollen grain has two cells, one of which develops into two male gametes after pollination, it is an immature male gametophyte. Microsporogenesis is the process of forming and differentiating microspores (pollen grains) from microspore mother cells (MMC) through reductional division. Pollen allergies are a well-known and widespread seasonal allergy. Many plants release pollen for fertilization at the end of the summer. The majority of pollen grains can cause allergic reactions. During the summer, these tiny grains are carried by the wind.