Seed Dispersal

Q. Seeds of xanthium are dispersed by:

1. air
2. water
3. animals
4. soil

Q.

Some seeds are thrown away or scattered when the fruit bursts with a sudden jerk.

1. True

2. False

Q. Question 1 (e)
Fill in the blanks:
(e) Seed dispersal takes place by means of ___, ___and ___.

Q.

In Xanthium, seed dispersal occurs with the help of

1. Hair

2. animals

3. Water

4. Wings

Q.

The winged seeds, such as those produced by Maple are dispersed by the wind.

1. False

2. True

Q.

Group the seeds given in figure (i) to (iii) according to their means of dispersion.
(a)Seed dispersed by wind.
(b)Seed dispersed by water
(c)Seed dispersed by an animal

Q. The seeds with hair like structures are dispersed by water.

1. False
2. True

Q.

The spongy seeds or seeds with the fibrous outer coat, are generally dispersed by___.

Q. The seeds of plants which grow near water bodies like coconut tree are dispersed through

1. wind
2. gravity
3. water
4. animal

Q.

Which of the following plants have seeds that do NOT get dispersed with the help of wind?

1. Drumsticks

2. Maple

3. Drumstick and maple

4. Mangrove

Q.

Cocount is a large and heavy fruit. How is it adapted for seed dispersal by water?

Q.

75 Air helps in the dispersal of …….. and ……..of flowers of several plants.

Q. Statement 1: Spiny seeds with hooks are dispersed by animals.

Statement 2: Some seeds are even dispersed by the bursting of fruits.

1. Only statement 1 is correct.
2. Only statement 2 is correct.
3. Both the statements are correct.
4. Both the statements are incorrect.

Q. Statement 1: The spongy seeds or seeds with the fibrous outer coat are generally dispersed by wind.

Statement 2: Maple seeds are dispersed by wind.

1. Only statement 1 is correct.
2. Only statement 2 is correct
3. Both the statements are correct.
4. Both the statements are incorrect.

Q. Coconut is a large and heavy fruit. How is it adapted for seed dispersal by water?

Q. The seeds which are dispersed by air are small, light and possess hair like structures or wings.

1. False
2. True

Q.

Some seeds are thrown away or are scattered when the fruit bursts with a sudden jerk.

1. True

2. False

Q. X, Y and Z are the agents of dispersal of the following seeds. Identify them.

Maple - X
Coconut - Y
Xanthium - Z

1. X-water, Y-wind, Z-gravity
2. X-water, Y-wind, Z-explosions
3. X-wind, Y-water, Z-animals
4. X-wind, Y-animals, Z-water

Q. Select all the modes of seed dispersal.

1. Animals
2. Wind
3. Water
4. Sunlight

Q.

Coconut fruits are dispersed by?

Q. Seeds with fibrous outer coats get dispersed through ____________.

1. 
   wind
2. 
   water
3. 
   birds
4. 
   animals

Q. Coconut is a large and heavy fruit that disperse seed through

1. Wind
2. Water
3. Birds
4. Animals

Q. Why is dispersal of seeds necessary? Name the agents of dispersal giving one example each of a seed that is dispersed by them.

Q. The seeds that have the floating ability by forming spongy, fibrous coat are dispersed by___.

Q.

Seeds of drumstick and maple are carried to long distances by wind because they possess
a) winged seeds
b) large and hairy seeds
c) long and ridged fruits
d) spiny seeds

Q. The seeds of ............ fruit are dry and dispersed by explosion due to the touch of our hands.

1. Cucumber
2. Balsam
3. Xanthium
4. Calotropis

Q. Which of these features is not present in seeds and fruits dispersed by the wind?
(a) They have wings.
(b) They have hair on them.
(c) They have spines on them.
(d) They are light.

Q. Coconut is a large and heavy fruit that disperse seed through

1. Wind
2. Water
3. Birds
4. Animals

Q. Seeds with fibrous outer covering are dispersed by ______.

1. wind
2. water
3. animals
4. insects

Q.

Write how the following seeds are dispersed.
(a)Seeds with wings
(b)Small and light seeds
(c)Seeds with spines/hooks