Question
How does silencing of specific mRNA in RNA interference prevent parasitic infestation?
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Answer
The nematode (parasite) cannot live in the transgenic host that expresses RNA interference.
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Similar questions
For two statements are given$-$one labelled Assertion and the other labelled Reason. Select the correct answer to these questions from the codes $(a), (b), (c)$ and $(d)$ as given below.
Assertion: The egg apparatus, consists of two synergids and one egg cell.
Reason: Filiform apparatus play an important role in guiding the pollen tubes into the synergids.
→Assertion: The egg apparatus, consists of two synergids and one egg cell.
Reason: Filiform apparatus play an important role in guiding the pollen tubes into the synergids.
For question two statements are given$-$one labelled Assertion and the other labelled Reason. Select the correct answer to these questions from the codes $(a), (b), (c)$ and $(d)$ as given below.
Assertion : Spleen can be thought of as an immunologic conference centre.
Reason: Spleen helps only in digestion.
→Assertion : Spleen can be thought of as an immunologic conference centre.
Reason: Spleen helps only in digestion.
Read the following and answer any four questions from $(i)$ to $(v)$ given below:
Cross pollination is the transfer of pollen grains from the anther of a one flower to the stigma of a genetically different flower. It is performed with the help of an external agency which may be abiotic $($e.g., wind, water$)$ or biotic $($e.g., insects, birds, bats, snails$)$. The diagram shows the carpel of an insect pollinated flower.
→Cross pollination is the transfer of pollen grains from the anther of a one flower to the stigma of a genetically different flower. It is performed with the help of an external agency which may be abiotic $($e.g., wind, water$)$ or biotic $($e.g., insects, birds, bats, snails$)$. The diagram shows the carpel of an insect pollinated flower.
- What is the most likely reason for non germination of pollen grain $Z$ ?
- Pollen grains $X$ and $Y$ were brought to the stigma earlier, therefore, their germination inhibited the germination of pollen grain $Z$.
- Pollen grain $Z$ was brought to the flower by wind, while pollen grains $X$ and $Y$ were brought to the flower by insect.
- Pollen grain $Z$ lacks protrusions that allow it to adhere properly onto the stigma surface.
- Pollen grain $Z$ comes from a flower of an incompatible species.
- Which of the following best describes the function of the pollen tube?
- It acts as a conduit to transport male gametes from the anther to the ovule.
- It acts as a conduit to transport male gametes from the stigma to the ovule.
- It contains key nutrients that serve to nourish the newly $-$ formed zygote.
- It digests the tissues of the stigma, style, and ovary.
- Pollination of a flower in which the pollen is carried by an insect is called:
- Anemophily.
- Ornithophily.
- Entomophily.
- Malacophil.
- Refer to the given characteristics of some flowers.
- The stamens hang out of the flower, exposing the anthers to the wind.
- The pollen grains are tiny and light.
- The flower has a sweet scent.
- The flower petals are brightly colored.
- Pollenkitt is generally found in:
- Anemophilous flowers.
- Entomophilous flowers.
- Ornithophilous flowers.
- Malacophilous flowers.
For question, two statements are given$-$one labelled Assertion and the other labelled Reason. Select the correct answer to these questions from the codes $(a), (b), (c)$ and $(d)$ as given below.
Assertion : Cornea is considered as an immunologically privileged site
Reason: A transplanted cornea is rarely rejected.
→Assertion : Cornea is considered as an immunologically privileged site
Reason: A transplanted cornea is rarely rejected.
For question two statements are given $-$ one labelled Assertion and the other labelled Reason. Select the correct answer to these questions from the codes $(a), (b), (c)$ and $(d)$ as given below.
Assertion : Many mangrove plants possess high levels of organic solutes.
Reason : This is an adaptation to cope with the conditions of high salt concentration and osmotic potential.
→Assertion : Many mangrove plants possess high levels of organic solutes.
Reason : This is an adaptation to cope with the conditions of high salt concentration and osmotic potential.
For question two statements are given $-$ one labelled Assertion and the other labelled Reason. Select the correct answer to these questions from the codes $(a), (b), (c)$ and $(d)$ as given below.
Assertion : Phytoplanktons grow in abundance in the profundal zone of lake.
Reason : Profundal zone is illuminated by light which supports growth of phytoplanktons.
→Assertion : Phytoplanktons grow in abundance in the profundal zone of lake.
Reason : Profundal zone is illuminated by light which supports growth of phytoplanktons.
For question two statements are given $-$ one labelled Assertion and the other labelled Reason. Select the correct answer to these questions from the codes $(a), (b), (c)$ and $(d)$ as given below.
Assertion : Cuscuta is an example of holoparasite.
Reason : Cuscuta does not depend on other plants for nutrition requirements.
→Assertion : Cuscuta is an example of holoparasite.
Reason : Cuscuta does not depend on other plants for nutrition requirements.
For question two statements are given$-$one labelled Assertion and the other labelled Reason. Select the correct answer to these questions from the codes $(a), (b), (c)$ and $(d)$ as given below.
Assertion: Pure lines are called true breed.
Reason: True breeds are used for cross breeding.
→Assertion: Pure lines are called true breed.
Reason: True breeds are used for cross breeding.
For question two statements are given $-$ one labelled Assertion and the other labelled Reason. Select the correct answer to these questions from the codes $(a), (b), (c)$ and $(d)$ as given below.
Assertion : Indiscriminate exploitation ofeconomically important wild plants may lead to their extinction.
Reason : Non $-$ conservation of their germplasm is responsible for this.
→Assertion : Indiscriminate exploitation ofeconomically important wild plants may lead to their extinction.
Reason : Non $-$ conservation of their germplasm is responsible for this.
For question two statements are given $-$ one labelled Assertion and the other labelled Reason. Select the correct answer to these questions from the codes $(a), (b), (c)$ and $(d)$ as given below.
Assertion : Aerenchyma is present in the leaves and petioles ofhydrophytes.
Reason : Aerenchyma imparts buoyancy to the hydrophytes.
→Assertion : Aerenchyma is present in the leaves and petioles ofhydrophytes.
Reason : Aerenchyma imparts buoyancy to the hydrophytes.