Which among the following is not a characteristic feature of sporopollenin?

(1) Sporopollenin is one of the most resistant organic material known.

(2) It can withstand high pressures.

(3) No enzyme that degrades sporopollenin is known.

(4) The exine exhibits a fascinating array of patterns and designs.

Subtopic:  Stamen: Male Gametophyte |
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Identify A, B and X :-

 X contains two cells - A and B. B is bigger than A, it has abundant food reserve and large irregularly shaped nucleus. A is small and floats in the cytoplasm of B. It is spindle shaped with dense cytoplasm and nucleus.

 

     A

       B

    X

(1)

Vegetative cell

Generative cell

Pollen grain

(2)

Generative cell

Vegetative cell

Pollen grain

(3)

Generative cell

Vegetative cell

Anther

(4)  

Generative cell   

Vegetative cell   

Filament

Subtopic:  Stamen: Male Gametophyte |
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Which among the following is not true about pollen grain?

(1) Rich in nutrients.

(2) Many species cause severe allergies and bronchial afflictions in some people often leading to chronic respiratory disorders– asthma, bronchitis, etc.

(3) Pollen consumption has been claimed to increase the performance race horses.

(4) Parthenium is used against pollen allergy.

Subtopic:  Stamen: Male Gametophyte |
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Pollen grain of which among the following lose viability within 30 minutes?

(1) Wheat

(2) Rosaceae

(3) Leguminoseae

(4) Solanaceae

Subtopic:  Stamen: Male Gametophyte |
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Which among the following is not a feature of pistil?

(1) Monocarpellary

(2) Syncarpous

(3) Monosporic

(4) Apocarpous

Subtopic:  Pistil: Female Gametophyte |
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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

Subtopic:  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

Subtopic:  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?

(1) Epidermis, tapetum, endothecium

(2) Epidermis, aril, endothecium

(3) Epidermis, endodermis, mesocarp

(4) Epidermis, middle layer and endothecium

Subtopic:  Stamen: Microsporangium |
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Which of the following points is incorrect about sporopollenin?
(1) It is one of the most resistant organic material known

(2) It can withstand high temperature and strong acids and alkali

(3) 2 enzymes that degrade sporopollenin are known so far

(4) Pollen grains are well preserved as fossils because of presence of sporopollenin

Subtopic:  Stamen: Male Gametophyte |
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The above diagram shows some stages in microgametogenesis. Identify A, Band C:
               A                               B                              C
(1) Symmetric spindle        Generative cell           Vegetative cell

(2) Symmetric spindle        Vegetative cell           Generative cell

(3) Asymmetric spindle       Vegetative cell           Generative cell

(4) Asymmetric spindle       Generative cell           Vegetative cell

Subtopic:  Stamen: Male Gametophyte |
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