Tag: levels of organisation in plants
Questions Related to levels of organisation in plants
The barrier between protoplasm and other environment in a plant cell is
-
Cell wall
-
Nuclear membrane
-
Tonoplast
-
Plasma membrane
In the plant cell, plasma membrane and cell wall both are present, both act as a barrier between protoplasm and the outer environment.
A plant cell has
-
Cell wall
-
A number of small vacuoles
-
A few large vacuoles
-
A single central vacuole
-
Both A and D
- A plant cell has a cell wall and single central vacuole.
- Plant cells are eukaryotic cells that differ in several key aspects from the cells of other eukaryotic organisms.
- Their distinctive features include:
- A large central vacuole
- A cell wall composed of cellulose and hemicellulose
- Specialized cell-to-cell communication pathways known as plasmodesmata
When a plant cell is placed in pure water, it?
-
Expands until the osmotic pressure reaches that of water
-
Becomes less turgid until the osmotic potential reaches that of pure water
-
Becomes more turgid until the pressure potential of cell reaches its osmotic potential
-
Becomes more turgid until the osmotic potential reaches that of pure water
Draw well labelled diagram of the following
-
plant cell
-
Animal cell
-
prokaryotic cell
-
Nerve cell
-
striated and smooth muscles
In a plant cell, O.P. is equal to?
-
T.P. $-$ D. P.D.
-
D. P. D. $-$ T.P.
-
T.P. $-$ D.P.
-
D. P.D. $+$ T.P.
The inclusion like raphides, druses and sphaeraphides can be mainly found in which of the following cells?
-
Prokaryotic
-
Protozoan cells
-
Hygrophytic plant cells
-
Xerophytic plant cells
Plant cells sometimes form mineral crystals. Calcium carbonate occurs as a mass of crystals around a cellulose core to form cystolith (eg, leaf of Banyan). In several plants, calcium oxalate forms needle-like raphides, prismatic crystals, star-shaped sphaeraphides or Druses or powdery mass named as crystal sand.
The percentage of water in a typical plant cell is about
-
10%
-
20%
-
50%
-
80%
Plants are made up of water, organic and inorganic substances. Water makes the majority of the volume of the plant cell. Water comprises of 80-90 percent of the plant's total weight. Water is used to support the cell structure, for metabolic functions, to carry the nutrients and for photosynthesis.
The secretory cells of the plants are
-
Nectary cells
-
Hydathode
-
Laticifer cells
-
All of the above
Most abundant element in plant body is
-
Potassium
-
Nitrogen
-
Carbon
-
Hydrogen
A most abundant compound in living organisms protoplasm is water. Plants contain even more water than animals do- most of them are anywhere from 90 to 95% water. In plants, about 85% of the fresh weight of leaves can be water. Each water molecule is made up of two hydrogen and one oxygen atom. Hence, hydrogen is the most abundant element in a plant body.
Growth of cell wall during cell elongation takes place by
-
Apposition
-
Intussusception
-
Both A and B
-
None of the above
Plant cell is covered by a cellulosic cell wall. The cell wall is dead at maturity but grows when immature to permit cell elongation. Intussusception is growth by deposition of new materials between existing components of cell walls. Cell elongation occurs through intussusception. In apposition, new wall layers are laid. Growth of wall in new cells occurs through apposition.