Q. No.When a plant grows from an embryo, the embryonic organ that persists for the entire life of the plant is:
1.
cotyledon
2.
hypocotyl
3.
suspensor
4.
seed coat
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In bananas, fruits can develop without fertilization. Such fruits are called as:
| 1. | Parthenogenetic | 2. | Parthenocarpic |
| 3. | True | 4. | False |
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In the given diagram showing T.S. of a typical angiosperm anther, the cells of which part are most likely to undergo mitosis, that is not normal, due to which many of them become bi or multinucleate?
| 1. | 1 | 2. | 2 |
| 3. | 3 | 4. | 4 |
Double fertilization, a characteristic feature of angiosperms, was discovered independently by Sergei Nawaschin and Léon Guignard. in France. It involves the joining of a female gametophyte with two male gametes. In double fertilization, the maternal contribution to the genetic constitution of the endosperm is:
1. same that of the embryo
2. double that of the embryo
3. triple that of embryo
4. quadruple that of embryo
Plant species pollinated by water fall into two categories:
| (i) | Those that distribute their pollen to the surface of water |
| (ii) | Those that distribute their pollen beneath the surface of water |
The correct examples of the two categories will be:
| (i) | (ii) | |
| 1. |
Vallisneria |
Sea grasses |
|
2. |
Water hyacinth |
Sea grasses |
|
3. |
Sea grasses |
Water lily |
|
4. |
Sea grasses |
Vallisneria |
Match each item in Column I with one in Column II and select your answer from the codes given:
|
Column I |
Column II |
||
|
A |
Stage at which more percent of angiosperms shed their pollen |
P |
3-celled |
|
B |
Pollen grains lose viability within 30 minutes of their release in |
Q |
2-celled |
|
C |
Persistent endosperm |
R |
Some cereals |
|
S |
Some members of Rosaceae |
||
|
T |
Coconut |
||
|
U |
Groundnut |
Codes:
|
A |
B |
C |
|
|
1. |
P |
S |
U |
|
2. |
P |
R |
T |
|
3. |
Q |
R |
T |
|
4. |
Q |
S |
U |
In strawberry:
I. The fruit is actually not a berry
II. Fleshy part is derived from ovaries
1. Only I is correct
2. Only II is correct
3. Both I and II are correct
4. Both I and II are incorrect
Which of the following is incorrect regarding seeds in angiosperms?
| 1. | Mature seeds of peas and ground nuts are ex-albuminous. |
| 2. | Perisperm is seen in the mature seeds of black pepper and beet. |
| 3. | Dormant seeds have relatively higher moisture content than germinating seeds. |
| 4. | As ovules mature into seeds, the ovary develops into a fruit. |
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To encourage cross-pollination, all the following devices will be useful in an angiosperm except:
| 1. | Self-incompatibility |
| 2. | Asynchrony between pollen release and stigma receptivity |
| 3. | Cleistogamous flowers |
| 4. | Dioecy |
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Identify the incorrectly matched pair:
|
1. |
Cleistogamous flowers |
Invariable autogamous |
|
2. |
Geitonogamy |
Functionally cross-pollination |
|
3. |
Wind pollination |
Common in grasses |
|
4. |
Pollination by water |
Seen in all aquatic plants |
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