Questions
Some bisexual flowers remain closed all their life so that the pollen can easily pollinate the stigma of the flower. What is this condition called?
- Homogamy
- Heterogamy
- Cleistogamy
- Dichtyogamy
- Protogyny
Which of the following statements is not true for self pollination?
- It preserves the parental characters indefinitely.
- It leads to loss of vigour and vitality.
- It leads to new varieties.
- The genetic defects of the plant variety cannot be eliminated.
- The flowers need not produce nectar and scent.
If the timing of maturation of androecium and gynoecium is different, the condition is called ____________.
- homogamy
- cleistogamy
- herkogamy
- dichogamy
- heterogamy
Which of the following is not correct about cross pollination?
- The process is economical.
- It is uncertain.
- It occurs in unisexual and bisexual flowers.
- Seeds produced are viable and healthier.
- It is a source of variation in offsprings.
If anthers of a flower mature earlier than stigma, the condition is called ________________.
- protandry
- protogyny
- cleistogamy
- herkogamy
- homogamy
Which of the following plants shows protogany?
- Lady's finger
- Sweet pea
- Salvia
- Peepal
- Commelina
Which of the following plants shows hydrophily?
- Grass
- Vallisneria
- Hazel
- Millow
- Maize
In which of the following plants do the pollen grains fail to fertilise the flower of the same plant but fertilise the stigma of the flower borne by another plant of the same species?
- Peepal
- Lady's finger
- Sweet pea
- Salvia
- Apple
In which of the following conditions are anther and stigma so placed in a flower that the pollen grains are unable to reach the stigma?
- Karyogamy
- Herkogamy
- Dichogamy
- Cleistogamy
- Protogyny
Which of the following is not a unisexual plant?
- Maize
- Castor
- Cucumber
- Salvia
- Palm
In which of the following conditions are the length of the style and position of anthers different?
- Herkogamy
- Heterostyly
- Dichogamy
- Protogyny
- Heterokamy
Which of the following plants shows herkogamy?
- Gloriosa
- Apple
- Grapes
- Salvia
- Castor
Which of the following is not a characteristic feature of flowers pollinated by water?
- Pollen grains are produced in a large number.
- Flowers are light in weight.
- Flowers are small and inconspicuous.
- Plants are monoecious.
- Pollen grains have specific gravity equal to water.
Which of the following is/are the agents of pollination in entomophily?
- Water
- Wind
- Insects
- Bats
- Birds
The food-storing tissue of flowers, which is formed by the fusion of male gamete and polar nuclei is called
- endosperm
- placenta
- synergid
- gametophyte
- micropyle
Which of the following is not a characteristic feature of insect pollinated flowers?
- Petals are small and white coloured.
- They produce copious amount of nectar.
- Pollen grains are produced in small quantity.
- Nectar guides are present.
- Anthers with short filaments are present.
Which of the following is not an insect pollinated flower?
- Salvia
- Petunia
- Butter cup
- Pine
- Dandelion
An endosperm in plants is
- 1n
- 2n
- 3n
- 4n
- 5n
Which of the following is not true about ovule?
- It is a small structure contained in the ovary.
- It is surrounded by integuments.
- It has an opening to one side called micropyle.
- It contains single polar nuclei.
- It also contains two synergids and three antipodal cells.
How many male gametes are present in a pollen tube?
- One
- Two
- Three
- Four
- Five