Tag: pollination, fertilization and development of endosperm and embryo

Questions Related to pollination, fertilization and development of endosperm and embryo

Hydrophily is best demonstrated by  

biology pollination and fertilization agents of pollination environmental conservation and biodiversity pollination, fertilization and development of endosperm and embryo

  1. Nelumbium

  2. Vallisneria

  3. Nymphaea

  4. Ranunculus

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Correct Option: B
Explanation:

Pollination by means of water is called as Hydrophily. In Vallisneria, the male flower is detached from the plant and it will float on the water and are bought in the contact of the stigma of the female flower.

So the correct option is 'Vallisneria.'

Assertion : Insects visit flowers the gather honey.

Reason : Attraction of flowers prevents the insects from damaging other parts of the plant.

biology pollination and fertilization agents of pollination environmental conservation and biodiversity pollination, fertilization and development of endosperm and embryo

  1. Both assertion and reason are true and reason is a correct explanation of the assertion.

  2. Both assertion and reason are true but reason is not a correct explanation of the assertion.

  3. Assertion is true but Reason is false

  4. Both Assertion and Reason are false

  5. Assertion is false but Reason is true

Show answer
Correct Option: D
Explanation:

Insect visit flowers to get nectar. The attraction of flower in plants is not to diverge the insect from damaging other part, but to bring about pollination (i.e., transfer of pollen to the stigma).

The flower is important to a plant because it helps in

biology pollination and fertilization agents of pollination environmental conservation and biodiversity pollination, fertilization and development of endosperm and embryo

  1. Attracting

  2. Production of nectar

  3. Pollination

  4. All of the above

Show answer
Correct Option: D
Explanation:

All the flowers are important to plant as they attract pollinators by producing nectar, attracting pollinators and helps to plants in the reproduction process by pollination.

So, the correct option is 'All of the above.'

Which of the following structure/arrangement favours entamophily the most?

biology pollination and fertilization agents of pollination environmental conservation and biodiversity pollination, fertilization and development of endosperm and embryo

  1. Pollen grains with wings and feathery stigma

  2. Colourful petals and nectar secretion

  3. A bunch of flowers with less pollen

  4. Pollen grains with mucous covering

Show answer
Correct Option: B
Explanation:

Pollination through insect is called as entamophily in which insect is attracted by nectar secreted by flower and colorful petals.

So the correct option is 'Colourful petals and nectar secretion.'

In Vallisneria, pollination is

biology pollination and fertilization agents of pollination environmental conservation and biodiversity pollination, fertilization and development of endosperm and embryo

  1. Hydrophilous

  2. Cleistogamous

  3. Anemophilous

  4. Entomophilous

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Correct Option: A
Explanation:

In Vallisneria, pollination is hydrophilous. Pollination carried out through water is hydrophily. Light and unwettable pollen grains are present in these plants. Pollen grains are surrounded by mucilaginous covering, hence protected from wetting.

An insect helping in pollination is

biology pollination and fertilization agents of pollination environmental conservation and biodiversity pollination, fertilization and development of endosperm and embryo

  1. Drosophila

  2. Musco nebulo

  3. Bombyx mori

  4. Apis dorsata

Show answer
Correct Option: D
Explanation:
Most of the major crops heavily depend on the pollination through the giant honey bee, Apis dorsata. Some of the crops are cotton, mango, coconut, coffee, pepper, star fruit, and macadamia.
So the correct option is Apis dorsata.

The nectar is produced in the flowers which are pollinated by 

biology pollination and fertilization agents of pollination environmental conservation and biodiversity pollination, fertilization and development of endosperm and embryo

  1. Wind

  2. Water

  3. Man

  4. Insects

Show answer
Correct Option: D
Explanation:

Many flowers produce nectar. When an insect lands on a flower to feed, pollen grains stick to its body. As the insect moves to another flower of the same species, these pollen grains are transferred to the flower’s stigma and pollination occurs.

So the correct option is 'Insects'.

Pollination in Vallisneria is

biology pollination and fertilization agents of pollination environmental conservation and biodiversity pollination, fertilization and development of endosperm and embryo

  1. Epihydrophily

  2. Hypohydrophily

  3. Subhydrophily

  4. Both B and C

Show answer
Correct Option: A
Explanation:

Pollination in Vallisneria is epihydriphilous. It is a type of hydrophily which occurs on the surface of water. The female flower have a very long pedicel, therefore it reaches the surface of water. Male flowers after breakage floats on the surface of water. Pollen grains are released on to the surface of water. They are carried passively by water currents, some of them eventually reach the female flowers and the stigma.

Pollination by water occurs in

biology pollination and fertilization agents of pollination environmental conservation and biodiversity pollination, fertilization and development of endosperm and embryo

  1. Ceratophyllum

  2. Zostera

  3. Lemna

  4. Both A and B

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Correct Option: D
Explanation:
Pollination by water occurs in Ceratophyllum and Zostera. These are aquatic plants. Pollination carried out through water is hydrophily. Pollination by water is quite rare in flowering plants and is limited to about 30 genera, mostly monocots, e.g. freshwater plants and marine water plants. Light and unwettable pollen grains are present in these plants.
Zostera is a totally submerged marine angiosperm. It has long, elongated and needle-like pollen grains which are without exine. They float below the surface of water and pollination by water occurs in this plant. 

Ceratophyllum is a totally submerged freshwater plant. 30-45 stamens are present in male flower. When sinking in water, female flowers come in contact with the pollen grains released from the male flower to effect pollination.
Lemna is also a water plant, but it undergoes pollination by the means of snail i.e., malacophily.

Some plants harbour ants to save themselves from other animals. It is

biology pollination and fertilization agents of pollination environmental conservation and biodiversity pollination, fertilization and development of endosperm and embryo

  1. Anemophily

  2. Entomophily

  3. Myrmecophily

  4. Hydrophily

  5. Zoophily

Show answer
Correct Option: C
Explanation:

Anemophily is a type of pollination in which pollination takes place with the help of wind. Entomophily is a type of pollination in which pollination takes place through insect. Myrmecophily is a mutual association of some plants with ants to save themselves from other animals. Hydrophily is a type of pollination in which pollination occurs through flow of water. 

Thus, the correct answer is option C.