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

(1) anthers

(2) styles

(3) ovaries

(4) hairs

Concept Questions :-

Pollination & Outbreeding Devices
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The arrangement of the nuclei in a normal embryo sac in the dicot plant is :

(1) 2+4+2

(2) 3+2+3

(3) 2+3+3

(4) 3+3+2

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In angiosperms, microsporogenesis and megasporogenesis

(1) occur in anther

(2) form gametes without further divisions

(3) involve meiosis

(4) occur in ovule

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Flowers are unisexual in

(1) pea

(2) cucumber

(3) china rose

(4) onion

Concept Questions :-

Pollination & Outbreeding Devices
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Coconut water from a tender coconut is

(a) Immature embryo

(b) Free nuclear endosperm

(c) Innermost layers of the seed coat

(d) degenerated nucellus

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Which of of the following fruits is parthenocarpic?
(a) Brinjal
(b) Apple
(c) Jackfruit
(d) Banana

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Male gametophyte in angiosperms produces 
(a) two sperms and a vegetative cell
(b) single sperm and a vegetative cell
(c) single sperm and two vegetative cells
(d) three sperms

Concept Questions :-

Stamen: Male Gametophyte
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Which one of the following statements is not true?

(a) Pollen grains are rich in nutrients and they are used in the form of tablets and syrups

(b) Pollen grains of some plants cause severe allergies and bronchial afflictions in some people 

(c) The flowers pollinated by flies and beetles secrete foul odour to attract them

(d) Honey is made by bees by digesting pollen collected from flowers

Concept Questions :-

Stamen: Male Gametophyte
Pollination & Outbreeding Devices
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Perisperm differs from endosperm in
(a) being a haploid tissue
(b) having no reserve food
(c) being a diploid tissue
(d) its formation by fusion of secondary nucleus with several sperms

Concept Questions :-

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Pollen grains are shed at which stage?

(1) 2 celled 

(2) 3 celled

(3) Usually at 2-celled, but sometimes 3-celled

(4) Single celled stage

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