Sexual Reproduction in Flowering Plants

Free sample questions

Sexual Reproduction in Flowering Plants — sample Biology questions with answers

1. Question 1

   What is the main function of the stigma in a flower?

   • AProduces pollen
   • BReceives pollen
   • CProduces ovules
   • DSupports the anther

   Answer: B. Receives pollen

   The stigma is the top part of the pistil that receives pollen during pollination.

2. Question 2

   Which part of the flower produces the egg cell?

   • AAnther
   • BFilament
   • COvule
   • DPetal

   Answer: C. Ovule

   The ovule contains the egg cell (female gamete) within the embryo sac.

3. Question 3

   What is the process of pollen grain formation called?

   • AMegasporogenesis
   • BMicrosporogenesis
   • CGametogenesis
   • DEndosperm formation

   Answer: B. Microsporogenesis

   Microsporogenesis is the formation of microspores (pollen grains) within the anther.

4. Question 4

   What is the chromosome number in a male gametophyte cell (pollen grain) if the parent plant is diploid ($2n=24$)?

   • A$24$
   • B$12$
   • C$48$
   • D$6$

   Answer: B. $12$

   The male gametophyte is haploid ($n$), so $n=12$ from $2n=24$.

5. Question 5

   What is meant by 'self-pollination'?

   • APollen falls on the stigma of the same flower
   • BPollen is transferred by wind
   • CPollen is transferred by insects
   • DPollen from one flower to the stigma of another flower on a different plant

   Answer: A. Pollen falls on the stigma of the same flower

   Self-pollination occurs when pollen from the anther falls onto the stigma of the same flower or another flower on the same plant.