(a) Parenchyma is the common living component of two complex permanent, tissues, xylem and phloem- It takes part in storage of nutrients and slow lateral conduction (water in xylem and nutrients in phloem). (b) Function differences. Xylem:- 1.Xylem conducts sap (water and minerals) 2. Conduction isRead more
(a) Parenchyma is the common living component of two complex permanent, tissues, xylem and phloem- It takes part in storage of nutrients and slow lateral conduction (water in xylem and nutrients in phloem).
(b) Function differences.
Xylem:- 1.Xylem conducts sap (water and minerals)
2. Conduction is mostly unidirectional, upwardly from roots to stem tips and leaves.
Phloem:- 1. Phloem conducts solutes or nutrients.
2. Conduction is often bidirectional from leaves. to roots and from roots to stem tips.
(a) Plant tissue in husk of coconut is sclerenchyma fibres. Reason for stiffness of sclerenchyma is deposition of lignin in cell walls of its cells. (b) Sclerenchyma fibres are thick walled dead cells while parenchyma cells are thin walled living cells.
(a) Plant tissue in husk of coconut is sclerenchyma fibres.
Reason for stiffness of sclerenchyma is deposition of lignin in cell walls of its cells.
(b) Sclerenchyma fibres are thick walled dead cells while parenchyma cells are thin walled living cells.
Unstriated muscle: (i) The cells of unstriated muscles are long, pointed at the ends and uninucleated. (ii) These muscles are present in alimentary canal, blood vessels, iris of the eye, ureter and bronchi. Cardiac muscle: (i) The cells of cardiac muscles are cylindrical, branched and uninucleated.Read more
Unstriated muscle: (i) The cells of unstriated muscles are long, pointed at the ends and uninucleated.
(ii) These muscles are present in alimentary canal, blood vessels, iris of the eye, ureter and bronchi.
Cardiac muscle: (i) The cells of cardiac muscles are cylindrical, branched and
uninucleated. (ii) Cardiac muscles are present in the heart (i.e. in the wall of heart).
The important functions of stomata are: (i) Exchange of gases with atmosphere, e.g., entry of carbon dioxide for photosynthesis and of oxygen for respiration. (ii) Transpiration, i.e., loss of water in the form of water vapour.
The important functions of stomata are:
(i) Exchange of gases with atmosphere, e.g., entry of carbon dioxide for photosynthesis and of oxygen for respiration.
(ii) Transpiration, i.e., loss of water in the form of water vapour.
(a) Name the living components common to both the complex permanent tissues found in plants. What is its function? (b) Give any two ways in which these tissues differ functionally from each other
(a) Parenchyma is the common living component of two complex permanent, tissues, xylem and phloem- It takes part in storage of nutrients and slow lateral conduction (water in xylem and nutrients in phloem). (b) Function differences. Xylem:- 1.Xylem conducts sap (water and minerals) 2. Conduction isRead more
(a) Parenchyma is the common living component of two complex permanent, tissues, xylem and phloem- It takes part in storage of nutrients and slow lateral conduction (water in xylem and nutrients in phloem).
See less(b) Function differences.
Xylem:- 1.Xylem conducts sap (water and minerals)
2. Conduction is mostly unidirectional, upwardly from roots to stem tips and leaves.
Phloem:- 1. Phloem conducts solutes or nutrients.
2. Conduction is often bidirectional from leaves. to roots and from roots to stem tips.
(a) Name the plant tissue found in the husk of coconut and also identify the chemical which is responsible for its stiffness. (b) Give one way in which it differs from parenchymatous cells.
(a) Plant tissue in husk of coconut is sclerenchyma fibres. Reason for stiffness of sclerenchyma is deposition of lignin in cell walls of its cells. (b) Sclerenchyma fibres are thick walled dead cells while parenchyma cells are thin walled living cells.
(a) Plant tissue in husk of coconut is sclerenchyma fibres.
See lessReason for stiffness of sclerenchyma is deposition of lignin in cell walls of its cells.
(b) Sclerenchyma fibres are thick walled dead cells while parenchyma cells are thin walled living cells.
Identify the type of tissue in the following: skin, bark of tree, bone, lining of kidney tubule, vascular bundle.
Skin: Epithelial tissue (squamous epithelium); Bark of tree: Cork (protective tissue); Bone: Skeletal tissue (connective tissue); Lining of kidney tubules: Cuboidal epithelial tissue; Vascular bundle: Complex permanent tissue-xylem and phloem'
Skin: Epithelial tissue (squamous epithelium);
See lessBark of tree: Cork (protective tissue);
Bone: Skeletal tissue (connective tissue);
Lining of kidney tubules: Cuboidal epithelial tissue;
Vascular bundle: Complex permanent tissue-xylem and phloem’
Differentiate between striated, unstriated and cardiac muscles on the basis of their structure and site/location in the body.
Unstriated muscle: (i) The cells of unstriated muscles are long, pointed at the ends and uninucleated. (ii) These muscles are present in alimentary canal, blood vessels, iris of the eye, ureter and bronchi. Cardiac muscle: (i) The cells of cardiac muscles are cylindrical, branched and uninucleated.Read more
Unstriated muscle: (i) The cells of unstriated muscles are long, pointed at the ends and uninucleated.
See less(ii) These muscles are present in alimentary canal, blood vessels, iris of the eye, ureter and bronchi.
Cardiac muscle: (i) The cells of cardiac muscles are cylindrical, branched and
uninucleated. (ii) Cardiac muscles are present in the heart (i.e. in the wall of heart).
What are the functions of the stomata?
The important functions of stomata are: (i) Exchange of gases with atmosphere, e.g., entry of carbon dioxide for photosynthesis and of oxygen for respiration. (ii) Transpiration, i.e., loss of water in the form of water vapour.
The important functions of stomata are:
See less(i) Exchange of gases with atmosphere, e.g., entry of carbon dioxide for photosynthesis and of oxygen for respiration.
(ii) Transpiration, i.e., loss of water in the form of water vapour.