SEXUAL REPRODUCTION IN FLOWERING PLANTS
2013 MARCH
1.
After syngamy and triple fusion in embryo sac,
embryo will be diploid and endosperm will (1)
2. i) Flowering
plants evolved an array of adaptations to achieve pollination.
a. Explain
pollination.
b. Point out
adaptations found in flowers for insect pollination and wind pollination.
c.
Illustrate pollination in Vallisnaria.
OR
ii) Artificial
hybridization is one of the major approaches for crop improvement programme. In
such crosses it is important to avoid unwanted pollen.
a. Explain how we
can protect stigma from unwanted pollen.
b. How artificial
pollination can be performed? (4)
2013 SAY
1. The
diagrammatic view of a typical anatropous ovule is shown below. Copy the
diagram and label the unlabeled parts. (2)
2. (a) In flowering plants, double fertilization
occurs during reproduction. One of the events of double fertilization is triple
fusion. Name the other event. (1)
2014 MARCH
1. In flowering
plants during double fertilization two events take place in the embryo sac
namely --------- and ------------ (1)
2. Sunflower is
pollinated by insects while rice is pollinated by wind.
a. How these
plants are adapted to their respective type of pollination method? (Hint – any
4 points) (4)
b. Plants can be
self or cross pollinated. What any two mechanisms existing in nature to promote
cross pollination. (1)
OR
a. The diagram
given below shows the transverse section of a young anther. Identify the parts
a, b, c and d. (2)
b. The
developmental stages of male gametes in plants consist of microsporogenesis and
male gametophyte. Arrange the following terms in their correct developmental
sequence. (3)
Pollen grain
Sporogenous
tissue
Anther
Microspore
tetrad
Pollen mother
cell
Male gamete
2014 SAY
1.
Egg cell formation in angiosperms involves
megasporogenesis and female gametophyte development.
a.
Briefly write the various steps involved in female
gametophyte development.
b.
Mature angiosperm embryo sac at maturity, though 8
nucleated is 7 celled.
What is your
explanation related to this statement? Explain. (3+1=4)