Development of Endosperm

Q. If the chromosome number in the root cell of Zea mays (maize) is 20. Then what would be the chromosome number in the cell of radicle (a), hypocotyl (b), epiblast (c), aleurone layer (d), and scutellum (e) respectively?

1. a = 20; b = 30; c = 30; d = 30; e = 20
2. a = 20; b = 20; c = 20; d = 30; e = 20
3. a = 20; b = 30; c = 20; d = 30; e = 20
4. a = 30; b = 20; c = 20; d = 20; e = 30
   

Q.

Coconut water from a tender coconut is:

1. Degenerated nucellus

2. Immature embryo

3. Free nuclear endosperm

4. Innermost layers of the seed coat

Q. The coconut water from tender coconut represents :

1. Endocarp
2. Fleshy mesocarp
3. Free nuclear proembryo
4. Free nuclear endosperm

Q.

Aggregate fruit is formed from

1. multicarpellary apocarpous ovary

2. multicarpellary syncarpous ovary

3. monocarpellary apocarpous ovary

4. monocarpellary syncarpous ovary

Q. Coconut water from a tender coconut is ___.

1. innermost layers of the seed coat
2. degenerated nucellus
3. immature embryo
4. free nuclear endosperm

Q.

Conditions necessary for seed germination are

1. oxygen and temperature

2. Carbon dioxide, light and oxygen

3. Soil, moisture and temperature

4. Temperature, oxygen and light

Q.

What is male gametophyte in case of gymnosperms?

Q. Coconut water is made up of while the surrounding white kernel constitutes .

1. cellular endosperm
2. nuclear endosperm
3. helobial endosperm
4. solid endosperm

Q. Study the following statements and select the correct option.
A. Tapetum nourishes the developing pollen grains
B. Hilum represents the junction between ovule and funicle
C. In aquatic plants such as water hyacinth and water lily, pollination is by water.
D. The primary endosperm nucleus is triploid

1. A and B are correct but C and D are incorrect
2. A, B and D are correct but C is incorrect
3. B, C and D are correct but A is incorrect
4. A and D are correct but B and C are incorrect

Q.

Grafting is not possible in monocots because they

1. have parallel venation

2. have scattered vascular bundles

3. lack cambium

4. are herbaceous

Q.

What would be the number of chromosomes of the aleurone cells of a plant with 42 chromosomes in its root tip cells?

1. 63

2. 84

3. 21

4. 42

Q.

list important differences in the reproductive stuctures of angiosperms and gymnosperms?