1. Parenchyma –
• They are found below the epidermis.
• They form the bulk of packing tissue within the plant between other tissues .
• They are tightly packed and turgid they provide support.
2. Collenchyma –
• Their cell walls have additional cellulose deposited in the corners.
• This provides them with extra mechanical strength.
3. Sclerenchyma –
• Their cells are dead due to large deposits of lignin on the primary cell wall.
• The lignified wall is thick and inner lumen is small, hence provide support.
• Sclerenchyma fibres are arranged in elongated and in longitudinal sheets giving extra support.
• They are found in mature plants.
4. Xylem –
• Has two types of specialised cells.
• Vessels and tracheids.
• Vessels are thick-walled tubes with lignin deposited in them.
• They give support and strength to the plant.
• Tracheids are spindle-shaped cells arranged with ends overlapping.
• Their walls are lignified.
• They help to support and strengthen the plant.
Wilfykil answered the question on February 28, 2019 at 12:35
- Name the defects of the ear(Solved)
Name the defects of the ear.
Date posted: February 28, 2019. Answers (1)
- List the effects of hard drugs on human health(Solved)
List the effects of hard drugs on human health
Date posted: February 28, 2019. Answers (1)
- What are the similarities between endocrine and nervous system?(Solved)
What are the similarities between endocrine and nervous system?
Date posted: February 28, 2019. Answers (1)
- Write brief notes on Thyroxine(Solved)
Write brief notes on Thyroxine
Date posted: February 28, 2019. Answers (1)
- State the Hormones produced in humans and their effects on the body.(Solved)
State the Hormones produced in humans and their effects on the body.
Date posted: February 28, 2019. Answers (1)
- Give the Components of the nervous system in humans(Solved)
Give the Components of the nervous system in humans
Date posted: February 28, 2019. Answers (1)
- Define the following:
1. Phototaxis
2. Osmotaxis
3. Chemotaxis(Solved)
Define the following:
1. Phototaxis
2. Osmotaxis
3. Chemotaxis
Date posted: February 28, 2019. Answers (1)
- Define the following terms as used in Genetics:
(Solved)
Define the following terms as used in Genetics:
1. Genotype
2. Phenotype
3. Alleles
4. Homozygous
5. Heterozygous
6. Hybrid
7. Hybrid vigour or Heterosis
Date posted: February 28, 2019. Answers (1)
- What are the Components of DNA?(Solved)
What are the Components of DNA?
Date posted: February 28, 2019. Answers (1)
- What are the Properties of Chromosomes?(Solved)
What are the Properties of Chromosomes?
Date posted: February 28, 2019. Answers (1)
- What is Genetic Engineering?(Solved)
What is Genetic Engineering?
Date posted: February 28, 2019. Answers (1)
- Define the term "Gene therapy"(Solved)
Define the term "Gene therapy"
Date posted: February 28, 2019. Answers (1)
- Define the term "cloning"(Solved)
Define the term "cloning"
Date posted: February 28, 2019. Answers (1)
- Discuss baculoviruses as bio control agents(Solved)
Discuss baculoviruses as bio control agents
Date posted: February 25, 2019. Answers (1)
- Describe how the human kidneys are structurally adapted to perform their functions.(Solved)
Describe how the human kidneys are structurally adapted to perform their functions.
Date posted: February 24, 2019. Answers (1)
- (a)(i)Explain why skeletal muscles are said to be antagonistic.
(ii)State two characteristics of skeletal muscles.
(b)State the role of flexor muscle in movement.
(Solved)
(a)(i)Explain why skeletal muscles are said to be antagonistic.
(ii)State two characteristics of skeletal muscles.
(b)State the role of flexor muscle in movement.
Date posted: February 24, 2019. Answers (1)
- How are the following structures of a leaf adapted to their functions:
(i)Petiole?
(ii)Veins?
(iii)Palisade mesophyll?
(iv)Guard cells?(Solved)
How are the following structures of a leaf adapted to their functions:
(i)Petiole?
(ii)Veins?
(iii)Palisade mesophyll?
(iv)Guard cells?
Date posted: February 24, 2019. Answers (1)
- What are the stages of pathogenesis of diseases?(Solved)
What are the stages of pathogenesis of diseases?
Date posted: February 23, 2019. Answers (1)
- State the 2 types of micro organism and give their features.(Solved)
State the 2 types of micro organism and give their features.
Date posted: February 23, 2019. Answers (1)
- What are the clinical importance of micro organism?(Solved)
What are the clinical importance of micro organism?
Date posted: February 23, 2019. Answers (1)