Which of the following statement is not correct for pollen grain?
1. It represents male gametophyte.
2. It is a spherical structure, about 25-50 micrometers in diameter.
3. Pollen grains are rich in nutrients.
4. In family rosaceae, leguminoseae and solanaceae pollen lose viability in 30 minute.

Subtopic:  Stamen: Male Gametophyte |
 90%
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In which organ the growth of pollen tube is observed, till it reaches the ovules?

A.Pollen tube

B.Style

C.Ovary

D.Stigma

Subtopic:  Pollen - Pistil Interaction |
 72%
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Read the statements and select option representing correct statements with respect to stamen.
A. The distal end of filament is attached to thalamus.
B. A typical anther is dithecous and bisporangiate.
C. Connective is sterile vasculated tissue.
D. Microsporangia develop further and become pollen sacs.

1. A & B

2. A & C

3. B & C

4. C & D

Subtopic:  Stamen: Anther | Stamen: Microsporangium |
 76%
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Genetically and functionally self-pollination is cent percent ensured with seed formation even in the absence of pollinators by

(1) Bisexuality

(2) Dicliny

(3) Geitonogamy

(4) Cleistogamy

Subtopic:  Pollination & Outbreeding Devices |
 82%
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How many statement(s) is/are correct for pollen grains?
a. Parthenium is a cause of bronhial afflictions
b. Intine exhibits fascinating array of patterns and designs
c. Cytoplasm of pollen grain is s urrounded by spermoderm
d. Generative cell is present when pollens are shed in 40 percent plants.

1. One

2. Two

3. Three

4. Four

Subtopic:  Stamen: Male Gametophyte |
 52%
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Fossilization of pollen grains is helped by

(1) Compatible protein  

(2) Sporopollenin

(3) Cellulose

(4) Pectin

Subtopic:  Stamen: Male Gametophyte |
 94%
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Gynoecium of Michelia and Papaver is similar in being

(1) Apocarpous                 

(2) Syncarpous

(3) Monocarpellary         

(4) Polycarpellary

 

Subtopic:  Pistil: Ovule |
 71%
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Find incorrect statement:

1. A polycarpellary, apocarpous gynoecium is found in Michelia
2. Many ovules are present in an ovary of papaya and orchids
3. Yellowish, powdery pollen grains found in Hibiscus
4. The more pistils may be fused together to form monocarpellary syncarpous gynoecium
Subtopic:  Pistil: Ovule |
 68%
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Match the column with respect to pollen grain:

Column I

Column II

a)

Vegetative Cell Nucleus

(i)

Abundant Reserve Food & Irregular Nucleus

b)

Germ Pore

(ii)

Spindle shaped with dense cytoplasm

c)

Exine

(iii)

Where the Sporopollenin is absent

(iv)

Variable Pattern & design

(v)

Continuous layer made up of Cellulose & pectin

        

1. a(iv), b(v), c(iii)         

2. a(i), b(iii), c(v)

3. a(i), b(iii), c(iv)             

4. a(iv), b(i), c(iii)

Subtopic:  Stamen: Anther |
 82%
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Which of the following statement is not associated with phenomenon of flowering?

(1) Decision for flowering takes place much before actual flower appears.

(2) During flowering several structural and hormonal changes takes place

(3) During flowering differentiation takes place

(4) Flowering is independent of environmental factors

Subtopic:  Stamen: Anther |
 78%
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