181.

Endothecium and tapetum are formed from

• primary sporogenous tissue

• primary parietal layer

• primary parietal layer and sporogenous tissue respectively

• sporogenous tissue and primary parietal layer respectively

Embryo rescue is resorted to

• obtain new generation of plants quickly

• to reduce chance of seedling growth

• ensure growth of interspecific hybrids

• induce somaclonal variations

Apomictic embryos in citrus arise from

• synergids

• maternal sporophytic tissue in ovule

• antipodal cell

• haploid cell

Following are the statements regarding sexual reproduction in flowering plants.

I. Parthenium is a plant that causes pollen allergy.

II. If tapetum is destroyed, then unfeasible male gametophytes are produced.

III. Egg apparatus has 3 synergids and 2 antipodal cells.

IV. Megaspore is the first cell of gametophytic generation.

Choose the incorrect option.

• I and II

• II and III

• III and IV

• I and IV

Parthenogene embryos in plants are those which are formed by

• unfertilised eggs

• fertilised eggs

• sporophytic cells

• male gametophyte

Match the following columns

Column I	Column II
A. Zoophily	1. Pollination by birds
B. Ornithophily	2. Pollination by insects
C. Entomophily	3. Pollination by bats
D. Chiropterophily	4. Pollination by animals

• A - 4; B - 1; C - 2; D - 3

• A - 1; B - 2; C - 3; D - 4

• A - 3; B - 2; C - 1; D - 4

• A - 4; B - 2; C - 1; D - 3

The scutellum observed in a grain of wheat or maize is comparable to which part of the seed in other monocotyledons?

• Endosperm

• Cotyledon

• Plumule

• Aleurone layer

The reduction division in chromosomes takes place in

• pollen grains

• tapetum

• megaspore cell

• megaspore mother cell

After pollination the number of chromosome in egg will be

• n

• 2n

• 3n

• None of these

Double fertilisation is the

• fertilisation of two eggs in an embryo sac

• fusion of one male gamete with the egg cell and another male gamete with the secondary nuclei

• fusion of two male gametes with two polar nuclei

• fusion of one male gamete with secondary nucleus