Seed plants originated about 360 million years ago. As these...

Seed plants originated about 360 million years ago. As these plants became established, they expanded into a wide range of terrestrial environments. As a result of this plant evolution, forests began to develop and provide vital ecosystem services, such as carbon storage, biodiversity, medicine, recreation, and water and air purification. There are two main forest types. Boreal forests are primarily composed of gymnosperms (naked seed plants). Deciduous forests are primarily composed of angiosperms (enclosed seed plants). The gymnosperm and angiosperm trees in these forests exhibit several adaptations for life in a terrestrial setting. Drag the terms on the left to the appropriate blanks on the right to complete the sentences. gametophyte sporophyte spores flowers pollen cuticles seeds Gymnosperm leaves have relatively thick [ ] and small surface areas due to their needle-shape, suiting them to arid terrestrial conditions. Gymnosperms and angiosperms produce [ ] that is carried by wind and other organisms, replacing the need for water for fertilization. [ ] are small, compact structures containing an embryo and nutrients with a protective coat that can be easily dispersed by wind, water, or other means. A highly reduced [ ] generation helps the plant cope with dehydration and UV radiation exposure. Angiosperms have [ ] that attract organisms to help pollinate and distribute seeds.

Transcript

00:01 Today we'll be solving a question in biology.

00:02 In here, they've given us a case study based on that we have to answer the given questions below.

00:09 So they've given us that seed plants originated about 360 million years ago as these plants become established the range of terrestrial environments.

00:20 As a result of this plant's evolution, forests began to develop and provide vital ecosystem services.

00:26 So 360 million years ago, forests began to expand.

00:30 Started to provide vital ecosystem services like production of oxygen for all organisms to breed and removal of carbon dioxide for preventing greenhouse gas effects so based on that they have just given that and they have also said that there are two main forest types boreal forests which are mainly composed of gymnosperms okay boreal forests are covered with gymnosperms and gimnosperms are naked seed plants, predecessors of angiosperms, okay? gimnosperms are naked seed plants and are predecessors of angiosperms.

01:16 Decidivus forests are primarily composed of angiosperms, okay? decidivus forests are covered with angiosperms.

01:26 Okay, now angioms are covered seed plants.

01:31 The seeds are not naked here the seeds are covered and they are the successes of gymnosperms so the gymnosperm and angiosperm tree exhibits several adaptations for a terrestrial settling so they've given us five questions here and they've also given us options based on that we have to answer the questions so the first question they've asked this gymnosperm leaves have a relatively thick dash and small surface areas due to that needle shape, suiting them to arid terrestrial conditions.

02:03 So the answer for this question would be cuticles, okay? because gymnosperms have thick cuticles which will reduce the amount of transpiration making the plants to have more water within them.

02:19 So the second question they have asked us is gymnosperms and angiosperms produce dash that is carried by wind and other organisms replacing the need for water for fertilization so for this question in the options they've given us either spores or pollen okay because these are the two weightless substances that add can carry spores or pollen but what we should remember is that pollen is something that's exclusively for angiosperms okay pollen grains are found exclusively in angiosperms in gymnosperms that is milk cone called as stobilized so the answer for the second question is spores.

03:01 Because spores, sport of it generation is present in both angiosperms and gymnosperms and would be the right answer as this question is asking on account of both angiosperm and gymnosperms.

03:12 So the third question they're asking us is dash are small, compact structures containing an embryo and nutrients with a protective code that can be easily dispersed by wind, water or other means.

03:24 And for this question, as we already know, the answer is, undeniably the seeds because seeds are special protective covering that contain embryo and can even go to a state of dormancy and can germinate in the most viable conditions so that's why seeds are called as wonder of the living world so the fourth question they've given us is about a highly radius dash generation helps with the plant scope with the dehydration and uv radiation exposure so the two two generations they've given us in the question options is gamutophytic and sporophytic okay so these are the options given to us in the question and within this we should choose one option so both gamutophytic as sport of i take have a similar time span in both gymnosperms and angiosperms gamutophytic is recessive which means it's available for a short span of time and sport of i take generations are dominant so what happens is in gamutophytic generation which will be arising, it will be helping in formation as well as fertilization of plants...

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