Which one of the following is surrounded by a callose wall?

  • Microspore mother cell

  • Male gemete

  • Egg

  • Pollen grain

What would be the number of chromosomes in the cells of the aleurone layer in a plant species with 8 chromosomes in it synergids ?

  • 16

  • 24

  • 32

  • 8

Parthenocarpic tomato fruits can be produced by :

  • removing androecium of flowers before pollen grains are released

  • treating the plants with low concentrations of gibberellic acid and auxins

  • raising the plants from vernalized seeds

  • treating the plants with phenylmercuric acetate.

Long filamentous threads protruding at the end of a young cob of maize are :

  • anthers

  • styles

  • ovaries

  • hairs

The arrangement of the nuclei in a normal embryo sac in the dicot plant is :

  • 2+4+2

  • 3+2+3

  • 2+3+3

  • 3+3+2

In angiosperms, microsporogenesis and megasporogenesis

  • occur in anther

  • form gametes without further divisions

  • involve meiosis

  • occur in ovule

Coconut water from a tender coconut is

  • Immature embryo

  • Free nuclear endosperm

  • Innermost layers of the seed coat

  • degenerated nucellus

Which of of the following fruits is parthenocarpic?

  • Brinjal

  • Apple

  • Jackfruit

  • Banana

Male gametophyte in angiosperms produces 

  • two sperms and a vegetative cell

  • single sperm and a vegetative cell

  • single sperm and two vegetative cells

  • three sperms

Which one of the following statements is not true?

people 

  • Pollen grains are rich in nutrients and they are used in the form of tablets and syrups

  • Pollen grains of some plants cause severe allergies and bronchial afflictions in some

  • The flowers pollinated by flies and beetles secrete foul odour to attract them

  • Honey is made by bees by digesting pollen collected from flowers

Perisperm differs from endosperm in

  • being a haploid tissue

  • having no reserve food

  • being a diploid tissue

  • its formation by fusion of secondary nucleus with several sperms

Identify the different parts of a typical dicot embryo labeled as A, B and C and select the correct option.

        A        B       C

(1)

Plumule

Cotyledons

Radicle

(2)

Radicle

Cotyledons

Plumule

(3)

Cotyledons

Plumule

Radicle

(4)

Cotyledons

Radicle

Plumule
  • 1
  • 2
  • 3
  • 4

Pollen grains are shed at which stage?

  • 2 celled 

  • 3 celled

  • Usually at 2-celled, but sometimes 3-celled

  • Single celled stage

Which of these is a diploid structure ?

  • Pollen grains

  • Egg

  • Megaspore

  • MMC

False fruit in an apple is formed from

  • receptacle

  • thalamus

  • peduncle

  • petals.

Cross pollination in true genetic sense is 

  • allogamy

  • cleistogamy

  • geitonogamy

  • autogamy

Seed of castor is

  • non-endospermic, exalbuminous

  • endospermic albuminous

  • endospermic exalbuminous

  • non-endospermic albuminous.

Ubisch bodies are secreted from

  • ovule

  • tapetum

  • both of these

  • none of these

Aleurone layer is

  • haploid

  • diploid

  • triploid

  • tetraploid

Edible part of apple is the

  • thalamus

  • mesocarp

  • epicarp

  • endocarp

Pollination by bat is called

  • ornithophily

  • chitopteriphily

  • malacophily

  • anemophily

During formation of which of the following free nuclear division occurs?

  • Flower

  • Endosperm

  • Gametes

  • Fruit

Xenia and metaxenia terms are related with

  • pollen culture

  • xylem and phloem

  • endosperm

  • embryo

Pollen grains are able to withstand extremes of temperature and dessication because their exine is composed of

  • cutin

  • suberin

  • sporopollenin

  • callose

The pollen tube usually enters the embryo sac

  • through one of the synergids

  • by directly penetrating the egg

  • between one synergid and central cell

  • by knocking off the antipodal cells

Double fertilization involves

  • fertilization of the egg by two male gametes

  • fertilization of two eggs in the same embryo sac by two sperms brought by one pollen tube

  • fertilization of the egg and the central cell by two sperms brought by different pollen tubes

  • fertilization of the egg and the central cell by two sperms brought by the same pollen tube.

Plants of which one of the following groups of genera are pollinated by the same agency?

  • Triticum, Cocos, Mangifera

  • Ficus, Kigelia, Casuarina

  • Salvia, Morus, Euphorbia

  • Bombax, Butea, Bauhinia

Apomixis is

  • formation of seeds by fusion of gametes

  • formation of seed without syngamy and meiosis

  • formation of seeds with syngamy but no meiosis

  • none of the above

Even after killing the generative cell with a laser beam, the pollen grain of a flowering plant germinates and produces normal pollen tube because

  • laser beam stimulates pollen germination and pollen tube growth

  • the laser beam does not damage the region from which pollen tube emerges

  • the contents of killed generative cell permits germination and pollen tube growth

  • the vegetative cell has not been damaged.

What is the charasteristic of tapetum ?

  • It does not store food.

  • It is multi-nucleated.

  • It is multi-layered structure.

  • It nourishes the megaspore.

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