Which one of the following is resistant to enzyme action?

(1) Cork

(2) Wood fibre

(3) Pollen exine

(4) Leaf cuticle

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Male gametes in angiosperms are formed by the division of:

(1) microspore

(2) generative cell

(3) vegetative cell

(4) microspore mother cell

Concept Questions :-

Stamen: Male Gametophyte
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Which one of the following is surrounded by a callose wall?

(1) Microspore mother cell

(2) Male gemete

(3) Egg

(4) Pollen grain

Concept Questions :-

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

(1) 16

(2) 24

(3) 32

(4) 8

Concept Questions :-

Double Fertilization
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Parthenocarpic tomato fruits can be produced by :

(1) removing androecium of flowers before pollen grains are released

(2) treating the plants with low concentrations of gibberellic acid and auxins

(3) raising the plants from vernalized seeds

(4) treating the plants with phenylmercuric acetate.

Concept Questions :-

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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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