Seed dormancy is the inability of seeds to germinate even when conditions for germination are optimum
Below as the causes of seed dormancy
1. Immature/ Underdeveloped embryo
2. Presence of chemical substances that inhibit germination
3. Hard/ Impermeable testa (impermeable to water)
4. Absence of chemical substances that cause germination
johnmulu answered the question on January 17, 2017 at 06:17
-
Name the ground material of each of the following organelles
(Solved)
Name the ground material of each of the following organelles:
a) Chloroplast
b) Nucleus
c) Mitochondrion
d) Plant cell vacuole
Date posted:
January 16, 2017
.
Answers (1)
-
Explain why only mutations in the genes of gametes can influence evolution
(Solved)
Explain why only mutations in the genes of gametes can influence evolution.
Date posted:
January 16, 2017
.
Answers (1)
-
What type of evolution produces analogous structures?
(Solved)
Name the type of evolution that produces analogous structures
Date posted:
January 16, 2017
.
Answers (1)
-
Name two important functions of fruits to the life cycle of plant
(Solved)
What are the important functions of fruits to the life cycle of plant?
Date posted:
January 16, 2017
.
Answers (1)
-
What is name given to addition of a dye to specimen during the preparation for viewing under the light microscope?
(Solved)
Addition of a dye to specimen during the preparation for viewing under the light microscope is called
Date posted:
January 16, 2017
.
-
Give one living cell in the plant and in the animal body that, when mature, lacks a nucleus
(Solved)
Name one living cell in the plant and in the animal body that, when mature, lacks a nucleus.
Date posted:
January 16, 2017
.
Answers (1)
-
What is the role of air in a germinating seed?
(Solved)
What is the role of air in a germinating seed?
Date posted:
January 16, 2017
.
Answers (1)
-
What are the advantages of metamorphosis to the life of insects?
(Solved)
Give two advantages of metamorphosis to the life of insects.
Date posted:
January 16, 2017
.
Answers (1)
-
What is the difference between homologous and analogous structures?
(Solved)
Give the difference between homologous and analogous structures.
Date posted:
January 16, 2017
.
Answers (1)
-
Name two respiratory surfaces in a mature frog apart from the lungs
(Solved)
Name two respiratory surfaces in a mature frog apart from the lungs.
Date posted:
January 16, 2017
.
Answers (1)
-
What is the effect of denitrifying bacteria in the soil?
(Solved)
Give the effect of denitrifying bacteria in the soil.
Date posted:
January 16, 2017
.
Answers (1)
-
Where does nitrogen fixation take place in a plant?
(Solved)
Name the part of plant where nitrogen fixation takes place.
Date posted:
January 16, 2017
.
Answers (1)
-
State two water-borne human diseases that are characterized by severe diarrhea
(Solved)
State two water-borne human diseases that are characterized by severe diarrhea.
Date posted:
January 16, 2017
.
Answers (1)
-
Name the habitat of a plant that has the following characteristics
(Solved)
Name the habitat of a plant that:
i) Has stomata on the upper leaf surface only
ii) Has sunken stomatal pores
Date posted:
January 16, 2017
.
Answers (1)
-
Which factors which destroy the semi - permeability of the cell membrane?
(Solved)
State two factors which destroy the semi-permeability of the cell membrane.
Date posted:
January 16, 2017
.
Answers (1)
-
Name the organelle that performs each of the following functions in a cell
(Solved)
Name the organelle that performs each of the following functions in a cell
i) Controls movement of substance in and out of the cell
ii) Stores enzymes
Date posted:
January 16, 2017
.
Answers (1)
-
Give one advantage of heterodonts over homodonts.
(Solved)
State one advantage of heterodonts over homodonts.
Date posted:
January 14, 2017
.
Answers (1)
-
State the; a) Material that strengthens the xylem tissue.
(Solved)
State the; a) Material that strengthens the xylem tissue.
b) Tissue that is removed when the bark of a dicotyledonous plant is ringed.
Date posted:
January 14, 2017
.
Answers (1)
-
State the following responses
(Solved)
State the following responses;
i) Euglena migrates from a dark place towards light.
ii) Hairs and leaves of insectivorous plants close rapidly and trap insects when they land on the plants.
Date posted:
January 14, 2017
.
Answers (1)
-
State two theories advanced to support the origin of life
(Solved)
State two theories advanced to support the origin of life
Date posted:
January 14, 2017
.
Answers (1)