Q. No.Which of the following statements is not correct for a pollen grain?
1. It represents a male gametophyte.
2. It is a spherical structure, about 25-50 micrometers in diameter.
3. Pollen grains are rich in nutrients.
4. In the families Rosaceae, Leguminosae and Solanaceae, pollen loses viability in 30 minutes.
1. It represents a male gametophyte.
2. It is a spherical structure, about 25-50 micrometers in diameter.
3. Pollen grains are rich in nutrients.
4. In the families Rosaceae, Leguminosae and Solanaceae, pollen loses viability in 30 minutes.
In which organ the growth of pollen tube is observed, till it reaches the ovules?
A.Pollen tube
B.Style
C.Ovary
D.Stigma
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
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
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
Fossilization of pollen grains is helped by
(1) Compatible protein
(2) Sporopollenin
(3) Cellulose
(4) Pectin
Gynoecium of Michelia and Papaver is similar in being
(1) Apocarpous
(2) Syncarpous
(3) Monocarpellary
(4) Polycarpellary
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 |
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 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)
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
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