Pollen Viability

Q. In ________ , pollen grains lose viability within 30 minutes of their release.

1. potato
2. rose
3. wheat
4. pulses

Q.

How long do you think pollen grains retain viability?

Q. Pollen grains can be stored for several years in liquid nitrogen having a temperature of

1. -196$°C$
2. -80$°C$
3. -120 $°C$
4. -160 $°C$

Q.

Pollen grains of a beautiful rose plant were used after a month of their release to pollinate a flower of the same species. Which one of the following events do you think will occur?

1. Pollen grains will germinate once an insect visits the flower.
2. The pollen grains will germinate.
3. The pollen will be rejected as it is no longer viable
4. None of these.

Q. [A]: Pollen grains are stored in liquid nitrogen.
[R]: Cryopreservation protects the viability of pollen.

1. A is true but R is false
2. A and R are false
3. Both A and R are true and R is the correct explanation of A
4. Both A and R are true but R is not the correct explanation of A

Q.

Choose the incorrect statement.

1. Pollen grains cause allergies and bronchial infections.

2. Pollen grains are rich in nutrients.

3. Consumptions of pollen grains of increase the perfomance of athletes and race horses.

4. Pollen tablets and syrups are used as food supplements.

Q. Which of the following is not true about pollen grains?

1. Pollen grains are used as food supplements.
2. Pollen consumption increases the performance of athletes and race horses.
3. Pollen grains of certain species cause allergies.
4. Pollen grains cannot be stored artificially.

Q. Out of many papaya plants growing in your garden, only a few bear fruits. Give reason. [2]

Q. Pollen grains of certain species are stored for several years in ___________.

1. liquid nitrogen
2. water
3. formalin
4. soil

Q. Cabbage is a biennial plant which produces flowers in second year of growth. In an attempt to make it flower in a single year, four potted plants (I, II, III and IV) of cabbage were subjected to different temperatures for several days as given in the table.

$\begin{array}{cc}\text{Potted plant}& \text{Temperature}\\ \text{I}& 5^{\circ }C\\ \text{II}& {20}^{\circ }C\\ \text{III}& {30}^{\circ }C\\ \text{IV}& {25}^{\circ }C\end{array}$

Which potted plant will show flowering ?

1. $I$
2. $II$
3. $III$
4. $I$

Q. In cereals, the pollen loses their viability within ___________ of their release.

1. 60 minutes
2. 70 minutes
3. 30 minutes
4. 90 minutes

Q. In ________ , pollen grains lose viability within 30 minutes of their release.

1. potato
2. rose
3. wheat
4. pulses

Q.

Pollen viability can be extended for years by storing pollen grains in

1. Liquid nitrogen at - 196⁰C

2. Liquid nitrogen at - 96⁰C

3. Liquid nitrogen at - 169⁰C

4. Liquid nitrogen at -100⁰ C

Q. Pollen grains of a beautiful rose plant were used after a month of their release to pollinate a flower of the same species. Which one of the following events do you think will occur?

1. The pollen will be rejected as it is no longer viable
2. The pollen grains will germinate.
3. Pollen grains will germinate once an insect visits the flower.
4. None of these

Q.

What do you understand by photoperiodism and vernalisation? Describe their significance.

Q. Pollen grain of large number of species can be stored in

1. Liquid carbon dioxide
2. Liquid nitrogen
3. Liquid sulphur dioxide
4. Liquid oxygen

Q. In ________ , pollen grains lose viability within 30 minutes of their release.

1. potato
2. rose
3. wheat
4. pulses

Q. Pollen grains of rice and wheat lose their viability in _________ minutes of their release.

1. $30$
2. $10$
3. $60$
4. $90$

Q. Minimum period of vegetative growth in Bamboo is

1. 12 years
2. 10 years
3. 50 years
4. 5 years

Q.

Pollen viability can be extended for years by storing pollen grains in

1. Liquid nitrogen at - ${196}^0$ C

2. Liquid nitrogen at - ${96}^0$ C

3. Liquid nitrogen at - ${169}^0$ C

4. Liquid nitrogen at -${100}^0$ C

Q. Which of the following is not true about pollen grains?

1. Pollen grains are used as food supplements.
2. Pollen consumption increases the performance of athletes and race horses.
3. Pollen grains of certain species cause allergies.
4. Pollen grains cannot be stored artificially.

Q. In pollen banks, pollen grains are stored at _______ ̊C temperature.

1. 196
2. 54
3. -196
4. -54

Q. In ________ , pollen grains lose viability within 30 minutes of their release.

1. potato
2. rose
3. wheat
4. pulses

Q.

Pollen viability can be extended for years by storing pollen grains in

1. Liquid nitrogen at - 196⁰C

2. Liquid nitrogen at - 96⁰C

3. Liquid nitrogen at - 169⁰C

4. Liquid nitrogen at -100⁰ C

Q. Assertion :Spathe, a bract of spadix attracts pollinators Reason: Spathe is often brightly do loured

1. If both the assertion and the reason are true and the reason is a correct explanation of the assertion
2. If both the assertion and reason are true but the reason is not a correct explanation of the assertion
3. If the assertion is true but the reason is false
4. If both the assertion and reason are false

Q. In ________ , pollen grains lose viability within 30 minutes of their release.

1. potato
2. rose
3. wheat
4. pulses

Q.

how long does it take for marigold / rice / wheat / coconut / mango plants to come flower?

Q.

give an example of a plant that produces flowers , that have self incompatibility as an outbreeding device.

Q. In sunflower, self pollination is avoided by _________.

1. Protogyny
2. Unisexuality
3. Self sterility
4. Protandry