Read the following statement and answer the questions that follow : “A guava fruit has 200 viable seeds.” (a) What are viable seeds? (b) Write the total number of : i) pollen grains are required to form 200 seeds ii) gametes to form 200 zygotes (c) Prepare a flow chart to depict the post- pollination events leading to viable-seed production in a flowering plant.

Palak Saksexsena · 31st Mar 2019 .

Read the following statement and answer the questions that follow : “A guava fruit has 200 viable seeds.”

(a) What are viable seeds?

(b) Write the total number of :

i) pollen grains are required to form 200 seeds

ii) gametes to form 200 zygotes

(c) Prepare a flow chart to depict the post- pollination events leading to viable-seed production in a flowering plant.

Padma Shinde · 31st Mar 2019 .

(a) Seeds those have the ability to retain power of germination over a period of time and are capable to germinate under favourable conditions are called as viable seeds.

(b) (i) 200 pollen grains are required to form 200 seeds because each pollen grain carries two male gametes but only one fuses with the egg to form a zygote that develops into a mature embryo.

(ii) Total of 400 gametes (200 male gametes + 200 female gametes) are required to form 200 zygotes and hence seeds after fertilisation.

(c)Post-pollination events that lead to viable-seed production in a flowering plant can be represented with help of the given flow chart

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