Factors Affecting Germination

Q.

Seeds kept in a refrigerator do not germinate because_________

1. They lose viability

2. They rot

3. A refrigerator doesn't provide optimum temperature

4. It does not get sunlight

Q.

Given below is the structure of root hair. Observe it and answer the following questions.

1. Label any four parts of the figure.
2. Define the term root hair.
3. Why does a root have large number of root hair?
4. What is the use of large vacuole in the root hair?

Q.

Answer the following questions: What is germination?

Q.

One can see many seeds germinating in wild during a rainy season. Choose the most appropriate reason/s.

1. Rain provides sufficient water

2. Dormancy of seeds end during the rainy season

3. More nutrients are made available due to rains

4. None of these

Q.

What are the five steps of germination?

Q.

Oxygen is necessary for the germination of seeds. True or false?

1. True

2. False

Q.

Seeds sown very deep in the soil fail to germinate because they
(a) cannot exert enough force to push the soil upward.
(b) do not get enough sunlight.
(c) get too much water.
(d) do not get enough oxygen.

Q.

Q1. (i) In the experiment to demonstrate anaerobic respiration we are using mercury in the test tube and the beaker why can't we use water instead?

(ii). Also tell the use of lime water in the experiments on respiration

Q.

Tropical plant seeds require ___ temperature for germination.

Q.

An essential condition for germination is

1. water

2. oxygen

3. temperature

4. all of these

Q.

Mention true or false. If false, write the correct statement.

1. Micropyle serves for the emergence of radicle.

Q.

A moderately warm temperature (25${}^{\circ }$C to 35${}^{\circ }$C) that is usually favorable for germination is called as __________

1. Warm temperature

2. Optimum temperature

3. Suitable temperature

4. Moderate temperature

Q. What is true about phytochrome?

1. $P_{fr}$ absorbs red light and becomes $P_r$
2. $P_{fr}$ absorbs yellow light and becomes $P_r$
3. $P_r$ absorbs red light and becomes $P_{fr}$
4. $P_r$ absorbs yellow light and becomes $P_{fr}$

Q. Which of the following is absolutely necessary for seeds to germination?

1. Mineral salts
2. Water
3. Light
4. Low temperature

Q. The minimum respiration rate is found in

1. Leaves.
2. Parenchyma.
3. Seeds.
4. Stem.

Q. The first factor to activate dormant seed embryo is

1. Oxygen.
2. Moisture.
3. Nutrients.
4. Hormones.

Q. Most seeds go through ____ period before germination.

1. Cold
2. Hot
3. Solid
4. None of the above

Q.

The inactivity of embryo in mature seed is called __.

Q.

What is the optimum temperature for a seed to germinate?

1. ${25}^{\circ }$ to ${35}^{\circ }$

2. ${20}^{\circ }$ to ${25}^{\circ }$

3. ${35}^{\circ }$ to ${45}^{\circ }$

4. ${45}^{\circ }$ to ${47}^{\circ }$

Q. Assertion :Seeds fails to germinate naturally at very low and high temperature. Reason: Seeds sown deep into the soil fail to germinate.

1. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
2. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
3. Assertion is correct but Reason is incorrect
4. Both Assertion and Reason are incorrect

Q.

The amount of water present in a dry mature seed is around

1. 10-15%

2. 80-95%

3. 70-90%

4. 85-90%

Q. Why is it important to plant seeds at the correct distances from each other?

Q. Select the correct option:

1. Heat
2. Oxygen
3. Water
4. ${CO}_2$

Q. All of the following statements about the role played by water in the growth of plants are true, except

1. It is a solvent in which several substances are dissolved.
2. It participates as a reagent in many reactions.
3. It helps in the germination of seeds but does not provide turgidity to growing cells.
4. It serves as the medium for transport of inorganic salts.

Q.

take some dry seeds of green gram. wash and soak them overnight in a bowl . next day drain out the water completely and leave the seeds in the bowl covered with a moist cloth. observe the seeds . write about the structures that come out of each seed. name the structure and write the plant tissue found in the structure. also mention the structure and funtion of the tissue

Q.

Which of the following statements is not true?

1. The seed coat breaks when the bean seeds germinate.

2. On germination, the plumule gives rise to the shoot and the radicle to the root.

3. On germination, the plumule comes out first.

4. The seeds of chickpea, green gram and pea can be germinated.

Q.

What is the optimum condition for seeds to germinate?

1. Air/Oxygen

2. Water

3. Optimum Temperature

4. All of these

Q. Seasonal growth cycle of plants can be influenced by

1. Amount of water
2. Amount of daylight
3. All of the above
4. Temperature

Q.

Seed sown very deep in the soil fail to germinate because they

1. absent
2. differentiated into three layers
3. undifferentiated
4. differentiated into five layers

Q. role of water in seed germination