The aquatic plant in which pollination is not carried out by water is:

(1) Vallisneria

(2) Water lily

(3) Zostera

(4) Hydrilla

Subtopic:  Pollination & Outbreeding Devices |
 84%
From NCERT
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Dioecy in plants prevents:

(1) Autogamy but not geitonogamy

(2) Geitonogamy but not autogamy

(3) Both autogamy and geitonogamy

(4) Neither autogamy nor geitonogamy

Subtopic:  Pollination & Outbreeding Devices |
 76%
From NCERT
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If the female parent produces unisexual flower:

(1) Emasculation must be done before maturity

(2) Emasculation must be done after maturity

(3) Emasculation must be done before pollination

(4) Emasculation is not needed

Subtopic:  Pollination & Outbreeding Devices |
 86%
From NCERT
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The central cell in the embryo sac, after triple fusion, becomes:

(1) Primary endosperm cell

(2) Endosperm

(3) Embryo

(4) Zygote

Subtopic:  Double Fertilization |
 85%
From NCERT
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The endosperm is completely consumed by the developing embryo in all of the following except:

(1) Pea

(2) Groundnut

(3) Beans

(4) Castor

Subtopic:  Seed |
 84%
From NCERT
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Epicotyl has a shoot apex and a few leaf primordial enclosed in a hollow foliar structure called as the:

(1) Coleoptile

(2) Coleorhiza

(3) Scutellum

(4) Perisperm

Subtopic:  Embryo |
 84%
From NCERT
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The micropyle remains as a small pore in the seed coat. During germination, this facilitates entry of:

I. Oxygen

II. Water

(1) Only I

(2) Only II

(3) Both I and II

(4) Neither I nor II

Subtopic:  Seed |
 93%
From NCERT
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Genetic self-incompatibility tends to increase

(1) pollen dispersal

(2) inbreeding

(3) pollination

(4) outcrossing

Subtopic:  Pollination & Outbreeding Devices |
 73%
From NCERT
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A fertilized embryo sac of an angiosperm contains:

I. Haploid cells

II. Diploid cells

III. Triploid cells

(1) I and II only

(2) I and II only

(3) II and III only

(4) I, II and III

Subtopic:  Pistil: Female Gametophyte |
 62%
From NCERT
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The embryo of a grass seed is enclosed by two protective sheaths, a(n) _________, which covers the young shoot, and a(n) __________, which covers the young root.

(1) plumule; radical

(2) hypocotyl; picotyls

(3) coleoptile; coleorhiza

(4) scutellum; replum

Subtopic:  Embryo |
 85%
From NCERT
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