An organic substance that can withstand environmental extremes and cannot be degraded by any enzyme is

1. cuticle

2. sporopollenin

3. lignin

4. cellulose

Even in absence of pollinating agents seed-setting is assured in

(1) Commellina

(2) Zostera

(3) Salvia

(4) fig

The coconut water and the edible part of coconut are equivalent to

(1) endosperm

(2) endocarp

(3) mesocarp

(4) embryo

What would be the number of chorosomes of the aleurone cells of a plant with 42 chromosomes in its root tip cells?

(1) 63

(2) 84

(3) 21

(4) 42

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

Transfer of pollen grains from the anther to the stigmaof another flower of the same plant is called

(1) xenogamy

(2) geitonogamy

(3) karyogamy

(4) autogamy

Wind pollinated flowers are