Pollination Self and Cross_Unsolved Paper
Chapter: How Do Organisms Reproduce | Topic: Pollination Self and Cross
POLLINATION SELF AND CROSS_UNSOLVED PAPER
Topic: Pollination Self and Cross
Q1. The transfer of pollen grains from the anther to the stigma is called:
- Fertilisation
- Germination
- Pollination
- Seed dispersal
Q2.Which situation represents self-pollination?
- Pollen moves from one flower to the stigma of another flower of the same species
- Pollen moves from the anther to the stigma of the same flower
- Pollen moves from a flower to the soil
- Pollen moves from one species to another unrelated species
Q3.Cross-pollination involves the transfer of pollen grains:
- Between two different flowers of the same species
- Only from anther to ovule
- From stigma to anther
- From ovary to stigma
Q4.Which of the following can act as an agent of cross-pollination?
- Wind
- Insect
- Water
- All of the above
Q5.Which statement is generally associated with cross-pollination?
- It involves pollen transfer between flowers of the same species
- It always occurs within the same flower
- It never requires a pollinating agent
- It prevents pollen from reaching the stigma
Q6. A bee carries pollen from one flower to another flower of the same species. This is an example of:
- Self-pollination
- Cross-pollination
- Fertilisation
- Germination
Short questions
Q1. Define pollination. Why is it an important step in the sexual reproduction of flowering plants?
Q2. What is self-pollination? Describe the pollen transfer involved in this process.
Q3. What is cross-pollination? How is it different from self-pollination?
Q4. Name any two agents that can help in cross-pollination. How do these agents help transfer pollen?
Q5. A honeybee visits a flower covered with pollen and then lands on another flower of the same species.
What type of pollination can this activity help bring about? Explain briefly.
Q6.Students notice that some flowers in the school garden are frequently visited by butterflies and bees, while others are not.
Why might insect visits be important for pollination?
Q1.Explain self-pollination and cross-pollination. Compare them on the basis of the source of pollen, movement of pollen, involvement of agents, and possible effects on variation among offspring.
Q2.Describe the different agents of cross-pollination. Explain how wind, insects, and water can help pollen grains reach the stigma of a suitable flower.
Q3.Cross-pollination can involve pollen transfer between different flowers of the same species. Explain why cross-pollination can be beneficial to flowering plants. Also discuss why plants may have features that encourage pollen transfer between flowers.
Q1. A student observes that pollen grains from the anther of one flower reach the stigma of the same flower.
a) Identify the type of pollination.
b) What is the source of the pollen in this case?
Q2. A farmer grows flowering plants in a field where many bees are active. Bees repeatedly move from one flower to another flower of the same crop.
a) Which type of pollination can the bees promote?
b) Why can the movement of bees between flowers be useful to the plants?
Q3. Two flowering plants are observed:
Plant A: Pollen reaches the stigma of the same flower.
Plant B: Pollen from one flower reaches the stigma of another flower of the same species.
Compare the type of pollination occurring in Plant A and Plant B. State one major difference between the two processes.