Relationship between a flower and honey-bee will help the flower for/in
- A.Faster development
- B.Pollination
- C.Quick germination of pollen
- D.Increase in size
Correct answer
Explanation
The correct answer is B, Pollination. While collecting nectar, a honey-bee carries pollen from one flower to the stigma of another, which lets the plant form seeds.
This is a classic case of mutualism: the bee gets nectar and pollen as food, and the flower gets its pollen moved. Flowers pollinated by insects (entomophily) are usually brightly coloured, scented and rich in nectar, and their pollen is sticky so it clings to the bee's hairy body. Honey-bees are among the most important pollinators of crops such as mustard, sunflower, apple and many fruits, which is why beekeeping often raises farm yields.
A is wrong because the bee's visit does not make the flower develop faster.
C is wrong because germination of pollen on the stigma depends on the plant's own chemistry, not on the bee.
D is wrong because a bee visit does not make the flower grow larger.
Exam tip: pollination by insects = entomophily, by wind = anemophily, by water = hydrophily, by birds = ornithophily.
Practice Questions
View allRecently, there was a growing awareness in our country about the importance of Himalayan nettle (Girardinia diversifolia) because it is found to be a sustainable source of
- A.anti-malarial drug
- B.biodiesel
- C.pulp for paper industry
- D.textile fibre
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The Himalayan nettle yields a strong natural fibre that can be spun and woven into cloth. Girardinia diversifolia, known as Himalayan giant nettle or allo, is a stinging shrub that grows wild in the moist forests of the Himalayas, including Uttarakhand, Himachal Pradesh and the North-east, as well as Nepal.
Read the full explanation →Which of the following statements are correct regarding the general difference between plant and animal cells ? 1. Plant cells have cellulose cell walls whilst animal cells do not. 2. Plant cells do not have plasma membrane unlike animal cells which do. 3. Mature plant cell has one large vacuole whilst animal cell has many small vacuoles. Select the correct answer using the code given below:
- A.1 and 2 only
- B.2 and 3 only
- C.1 and 3 only
- D.1,2 and 3
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Plant cells have a cellulose wall and one large central vacuole, but they do have a plasma membrane, just like animal cells.
Read the full explanation →Consider the following statements : 1. In tropical regions, Zika virus disease is transmitted by the same mosquito that transmits dengue. 2. Sexual transmission of Zika virus disease is possible. Which of the statements given above is/are correct ?
- A.1 only
- B.2 only
- C.Both 1 and 2
- D.Neither 1 nor 2
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Zika is spread mainly by the Aedes mosquito that also carries dengue, and it can pass between sexual partners. The Zika virus is a flavivirus first identified in Uganda's Zika forest in 1947.
Read the full explanation →What is the importance of using Pneumococcal Conjugate Vaccines in India ? 1. These vaccines are effective against pneumonia as well as meningitis and sepsis. 2. Dependence on antibiotics that are not effective against drug-resistant bacteria can be reduced. 3. These vaccines have no side effects and cause no allergic reactions. Select the correct answer using the code given below :
- A.1 only
- B.1 and 2 only
- C.3 only
- D.1, 2 and 3
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The vaccine protects against several pneumococcal diseases and so cuts antibiotic use, but no vaccine is free of side effects.
Read the full explanation →Which one of the following is NOT true for bleaching powder?
- A.It is used as a reducing agent in chemical industries
- B.It is used for bleaching wood pulp in paper factories
- C.It is used for disinfecting drinking water
- D.It is used for bleaching linen in textile industry
Show answer
Bleaching powder is an oxidising agent, not a reducing agent, so this statement is the false one. Bleaching powder, calcium oxychloride (CaOCl₂), is made by passing chlorine gas over dry slaked lime, Ca(OH)₂.
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