Question

12. Define external fertilisation. Mention its disadvantages.
13. Differentiate between a zoospore and a zygote.
14. Differentiate between gametògenesis from embryogenesis.
15. Describe the post-fertilisation changes in a flower.
16. What is a bisexual flower? Collect five bisexual flowers from
neighbourhood and with the help of your teacher find out their com
and scientific names.
17. Examine a few flowers of any cucurbit plant and try to identif
staminate and pistillate flowers. Do you know any other plant
bears unisexual flowers?
18. Why are offspring of oviparous animals at a greater risk as com
to offspring of viviparous animals?
give answer of 12, 13, 14, 15​

Answer 1

u want every ans plz tell

Answer 2

Hey mate

Here is your answers:

12.In external fertilization, eggs have less chances of fertilization. This can lead to the wastage of a large number of eggs produced during the process. Further, there is an absence of proper parental care to the offspring, which results in a low rate of survival in the progenies.

13.A zoospore is a motile asexual spore that utilizes the flagella for movement. A zygote is a non-motile diploid cell formed as a result of fertilization. It is formed as a result of sexual reproduction.

14.The main difference between gametogenesis and embryogenesis is that both meiosis and mitosis occur during gametogenesis whereas only mitosis occurs during embryogenesis. Furthermore, gametogenesis is responsible for the production of male and female gametes while embryogenesis is responsible for the formation and the development of the embryo.

15.After fertilization, the following changes are observed in a flower: There is formation of a diploid zygote and it develops into an embryo, which forms the future plant. The endosperm cells serve as a source of nutrition for the developing embryo. The ovule becomes the seed.

Hey dude it is not copied answer it is originally made.

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