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Question 34 Which of the following was not a challenge for survival of the first land plants? O sperm transfer desiccation an
Which of the following sex and generation combinations most directly produces the fruit? O female gametophyte O female sporop
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Answer #1

34. (CORRECT ANSWER) (ANIMAL PREDATION)

(EXPLANATION) Animal predation was not a challenge to the first land plants as the first land animals evolved only after the first land plants. Hence, this option is correct.

(EXPLANATION FOR INCORRECT ANSWER) (SPERM TRANSFER) This was a challenge to the first land plants as water serves the medium for the transfer of sperm. Hence, this option is incorrect.

(EXPLANATION FOR INCORRECT ANSWER) (DESSICATION) This was a challenge to the first land plants as their ancestors were aquatic organisms. Therefore, the land plants had to evolve mechanisms to prevent desiccation i.e. drying out. Hence, this option is incorrect.

(EXPLANATION FOR INCORRECT ANSWER) (ABSORBING ENOUGH LIGHT) Despite enough availability of light, this was a challenge to the first land plants. This is because due to the large volume of plants the small ones could be overshadowed by the large ones. Hence, this option is incorrect.

(EXPLANATION FOR INCORRECT ANSWER) (SOURCES OF WATER) The first land plants evolved from freshwater algae. The evolution of these plants from aquatic organisms indicates the availability of water. As their ancestors were surrounded by water. Hence, this option is incorrect.

QUESTION Which of the following sex and generation combinations most directly produces the fruit?

(CORRECT ANSWER) (FEMALE SPOROPHYTE)

(EXPLANATION) The female sporophyte is the structure that is closely related to the production of fruit. Hence this option is correct.

(EXPLANATION FOR INCORRECT ANSWER) (FEMALE GAMETOPHYTE) The development of female gametophyte takes place inside the ovule and consists of three antipodal cells, two synergid cells, one central cell, two synergid cells, and one egg cell. It is also called the embryo sac or megagametophyte. Hence, this option is incorrect.

(EXPLANATION FOR INCORRECT ANSWER) (MALE GAMETOPHYTE) The male gametophyte develops within the anther and consists of two sperm cells enclosed within a vegetative cell. It is also called as the pollen gram or microgametophyte. Hence this option is incorrect.

(EXPLANATION FOR INCORRECT ANSWER) (MALE SPOROPHYTE) This combination does not directly produce the fruit. Hence this option is incorrect.

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