Tag: environmental conservation and biodiversity

Quizzes (0) Questions (270)

Questions Related to environmental conservation and biodiversity

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

Pollen grains have spiny exine to aid in

  1. Entomophily

  2. Anemophily

  3. Ornithophily

  4. Cheiropterophily
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
• Entomophily is the pollination of flowers by means of insects.
• Anemophily is the pollination of flowers by means of wind.
• Ornithophily is the pollination of flowers by means of birds.
• Chiropterophily is the pollination of flowers by means of bats.
The pollen grains which have spiny exine are related to Entomophily i.e. pollination by insects. Spines help in the attachment of the pollen to the body of pollinators. This, pollen grains have spiny exine to aid in Entomophily.
So, the correct answer is A.
Multiple choice biology pollination and fertilization agents of pollination environmental conservation and biodiversity pollination, fertilization and development of endosperm and embryo

In entomophily, pollinating agents are

  1. Insects

  2. Bats

  3. Birds

  4. Ants
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

In entomophily, insects are the pollinating agents. Insects are the most common biotic agents of pollination. Bees are the most common insect which acts as pollinating agents. Other insect pollinators are butterflies, flies, beetles, wasps, ants, moths. Majority of insect-pollinated flowers are large-sized. These flowers are scented, colorful and fragrant and contain nectaries to attract insects. 

Hence, option A is the correct answer.

Multiple choice biology pollination and fertilization agents of pollination environmental conservation and biodiversity pollination, fertilization and development of endosperm and embryo
Hydrophily occurs in

  1. Nymphaea

  2. Nelumbo

  3. Eichhornia crassipes

  4. Vallisneria/ Zostera
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation
Hydrophily is pollination of flowers by means of water. Example Zostera. 
When pollination occurs by water in the plants floating on the surface of the water, it is called Ephydrophily. Example Vallisneria.
In Zostera, long needle-shaped pollens are produced which float in the water. The female flower produces long structure from the stylar stigmatic region which extends to the water surface and coils around the pollen grain and pulls it underwater and thus, pollination occurs.
In Vallisneria, the male flowers detach on maturity and float on the surface of the water while the female flowers grow under water and they come up to the surface with the help of their thin long stalk. As the stalk grows further, the flowers which were vertical become horizontal and thus, a cup-like depression is formed around the female flower. The male flowers which are floating on the surface of the water, fall into the cup and due to jerk, the anthers dehisce and pollens are transferred to the stigma and thus, pollination occurs on the surface of the water. 
Hence, hydrophily occurs in Vallisneria and Zostera.
So, the correct answer is D.
Multiple choice biology pollination and fertilization agents of pollination environmental conservation and biodiversity pollination, fertilization and development of endosperm and embryo

Which pollinating agents is responsible to bring about $80\%$ of pollination?

  1. Insects

  2. Water

  3. Humans

  4. Wind
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
  • About 80 percent of all plant pollination is biotic i.e it is carried out by insects such as bees, wasps, and birds.
  • The remaining 20 percent of abiotically pollinated species, 98 percent is by wind pollination and 2 percent by water pollination.
Multiple choice biology pollination and fertilization agents of pollination environmental conservation and biodiversity pollination, fertilization and development of endosperm and embryo

Spiny or sticky pollen grains and large, attractively coloured flowers are associated with

  1. Hydrophily

  2. Entomophily

  3. Ornithophily

  4. Anemophily
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Entomophily type of pollination takes place through the agency of insects. The entomophilous flowers are brightly colored and fragrance to attract the insects. Their pollen grains are sticky or spiny to easily get attached with the body of pollinators. When the insects visit the flowers, their body gets dusted with pollen grains, and when they fly and visit other flowers, they brush against the stigma which being sticky, at once receives the pollen grains from their body. Thus, cross-pollination is achieved. 

So, the correct answer is 'Entomophily'.

Multiple choice biology pollination and fertilization agents of pollination environmental conservation and biodiversity pollination, fertilization and development of endosperm and embryo
Thread-like pollen without exine are found in

  1. Hydrophily

  2. Entomophily

  3. Anemophily

  4. Chiropterophily
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
Thread like pollen are found in Hydrophily where pollination occurs by means of water. Such pollen grains sometimes lack exine and form thread-like structures called the viscin threads. These structures aid the pollen to swim in water and thus, pollination can occur when they come in contact with a female flower.
So, the correct answer is A.
Multiple choice biology pollination and fertilization agents of pollination environmental conservation and biodiversity pollination, fertilization and development of endosperm and embryo

The hydrophilous flowers, pollinated completely under water, are known 

as ...............

  1. Epihydrogamous

  2. Hypohydrogamous

  3. Both (A) and (B)

  4. Polyhydrogamous.
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Hypohydrogamy includes the plants which are pollinated inside the water, e.g., Ceratophyllum, Naja, etc. Epihydrogamous - includes the plants which are pollinated on the surface of water.

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

The pollination is ......... in eel grass

  1. Hydrophilous

  2. Zoophilous

  3. Entomophilous

  4. Anemophilous
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

A tethered structure of the eel grass flower draws in free sailing male flowers for pollination by forming a dimple on water surface. The female flower is also blown by the wind, but it is anchored by its stem. As the breeze tugs at it, so its stem pulls it lower in the water, creating a dimple in the surface. The male ship, moving freely, sails into the dimple, toboggans down its slope and collides so violently with the female flower that the pollen is knocked out of its anthers. The female flower, having achieved fertilization, then closes.

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

Underwater, pollination occurs in

  1. Zostera

  2. Nymphaea

  3. Vallisneria

  4. None of the above
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Hydrophily includes plants which are pollinated inside the water. Zostera marina is a submerged marine perennial. The pollen is exceptionally long and needle like. Specific gravity of these pollen is almost the same as that of sea water. Consequently, they can freely float in water any depth. The stigma is also very long in this plant. If the pollen comes in contact with the stigma, it coils around water. 

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

Bees are very important for agriculturists as .................

  1. They give bees wax

  2. They are agents for pollination

  3. Are agents to carry fruits

  4. Produce honey
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The most recognized pollinators are the various species of bees, which are plainly adapted to pollination. Bees typically are fuzzy and carry an electrostatic charge. Both features help pollen grains adhere to their bodies but they also have specialized pollen carrying structures; in most bees takes the form of a structure known as scopa, which is on the hind  legs of most bees, and or the lower abdomen made up of thick plumose setae. Honey bees, bumblebees and their relatives do not have a scopa, but the hind leg is modified into a struture called the corbicula. Most bees gather nectar, a concentrated energy source and pollen, which is high protein food, to nurture their young and inadvertently transfer some among the flowers as they are working.