Pollen tablets are available in the market for
(1) In vitro fertilisation
(2) breeding programmes
(3) supplementing food
(4) Ex situ conservation
Non-albuminous seed is produced in
(1) maize
(2) castor
(3) wheat
(4) pea
An organic substance that can withstand environmental extremes and cannot be degraded by any enzyme is
1. cuticle
2. sporopollenin
3. lignin
4. cellulose
Wind pollination is common in
(1) lilies
(2) grasses
(3) orchids
(4) legumes
Nucellar polyembryony is reported in species of
(1) Gossypium
(2) Triticum
(3) Brassica
(4) Citrus
In which one of the following pollination is autogamous?
(1) Xenogamy
(2) Chasmogamy
(3) Cleistogamy
(4) Geitonogamy
Apomictic embryos in Citrus arise from
(1) synergids
(2) maternal sporophytic tissue in ovule
(3) antipodal cells
(4) diploid egg
Wind pollinated flowers are
1. | small, brightly coloured, producing large number of pollen grains |
2. | small, producing large number of dry pollen grains |
3. | large, producing abundant nectar and pollen |
4. | small, producing nectar and dry pollen |
Endosperm is consumed by developing embryo in the seed of
(1) coconut
(2) castor
(3) pea
(4) maize
What does the filiform apparatus do at the entrance into ovule?
1. It helps in the entry of pollen tube into a synergid
2. It prevents entry of more than one pollen tube into the embryo sac
3. It brings about opening of the pollen tube
4. It guides pollen tube from a synergid to egg