211.

Which one of the following represents an ovule, where the embryo sac becomes horse-shoe shaped and the funiculus and micropyle are close to each other?

• Circinotropous

• Anatropous

• Amphitropous

• Atropous

Double fertilisation was discovered by

• Nawaschin

• Starsburger

• Emerson

• None of the above

Among plants "pheromones" are secreted by the cells of the following plants for given function

• all plants for growth and development

• Yeast for facilitating mating

• all fungi for sexual reproduction

• Rhizopus for formation of zygospore

If the pollen tube enters the ovule through funiculus, the phenomenon is known as

• porogamy

• chalazogamy

• mesogamy

• heterogamy

Which of the following is the most resistant material in pollen grain

• Sporopollenin

• Intine

• Exine

• Certicle

For the formation of tetrasporic embryosac, how many megaspore mother cells are required?

• 1

• 2

• 3

• 4

Double fertilization means

• fusion of nucleus of male gamete with the egg nucleus

• fusion of two polar nuclei

• fusion of sperm nucleus with secondary nucleus

• fusion of one sperm nucleus with nucleus and fusion of other sperm nucleus with secondary nucleus

If there are 4 microspore mother cells in an anther, what will be the number of pollen grains?

• 4

• 8

• 12

• 16

After double fertilisation, a mature ovule has

• I diploid and I haploid cell

• 1 diploid and I triploid cell

• 2 haploid and I triploid cell

• 1 haploid and I triploid cell

Identify the parts labelled A, B, C and D in the given figure and select the correct option.

• A- Scutellum, B- Epiblast, C- Coleoptile, D- Coleorhiza

• A- Scutellum, B- Coleorhiza, C- Coleoptile, D- Epiblast

• A- Scutellum, B- Coleoptile, C- Coleorhiza, D- Epiblast

• A- Epiblast, B- Coleoptile, C- Coleorhiza, D- Scutellum