In angiosperms, viability of pollen grains generally depend on

(1) Pressure and humidity

(2) Temperature and humidity

(3) Plant type

(4) Structure of pollen

Concept Questions :-

Pollination & Outbreeding Devices
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Pollen grain of which among the following lose viability within 30 minutes?

(1) Wheat

(2) Rosaceae

(3) Leguminoseae

(4) Solanaceae

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Which among the following is not a feature of pistil?

(1) Monocarpellary

(2) Syncarpous

(3) Monosporic

(4) Apocarpous

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Cryopreservation is a technique to preserve substances like pollen grains in liquid nitrogen at temperature

(1) –150 °C

(2) 77.15 K

(3) –210 °C

(4) 110 K

Concept Questions :-

Stamen: Male Gametophyte
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A, B, C, D in the following diagram respectively are:-

(1) Hilum, funicle, inner integument, micropyle

(2) Hilum, funicle, outer integument, micropyle

(3) Funicle, outer integument, nucellus, chalazal pole

(4) Funicle, outer integument, nucellus, micropylar end

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Megasporangium is equivalent to:

(1) Embryo sac

(2) Ovary

(3) Nucellus

(4) Ovule

Concept Questions :-

Pistil: Ovule
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Microsporangium is generally surrounded by 4 wall layers. Which of the following 3 wall layers perform the function of protection and help in the dehiscence of anther to release the pollen?
(a) Epidermis, tapetum, endothecium
(b) Epidermis, aril, endothecium
(c) Epidermis, endodermis, mesocarp
(d) Epidermis, middle layer and endothecium

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The above given diagram is an enlarged view of one microsporangium of a mature anther. Identify A, B and C
(a) A - Middle layer, B - Endothecium, C – Tapetum
(b) A - Endothecium, B - Tapetum, C - Middle layer
(c) A - Endothecium, B - Middle layer, C – Tapetum
(d) A - Tapetum, B - Middle layer, C - Endothecium

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Which of the following points is incorrect about sporopollenin?
(a) It is one of the most resistant organic material known
(b) It can withstand high temperature and strong acids and alkali
(c) 2 enzymes that degrade sporopollenin are known so far
(d) Pollen grains are well preserved as fossils because of presence of sporopollenin

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The above diagram shows some stages in microgametogenesis. Identify A, Band C:
               A                               B                              C
(a) Symmetric spindle        Generative cell           Vegetative cell
(b) Symmetric spindle        Vegetative cell           Generative cell
(c) Asymmetric spindle       Vegetative cell           Generative cell
(d) Asymmetric spindle       Generative cell           Vegetative cell

Concept Questions :-

Stamen: Male Gametophyte
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