Tag: structure of a plant cell

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Multiple choice biology structural organization in living organisms structure of a plant cell levels of organisation in plants plant and animal cell

The percentage of water in a typical plant cell is about 

  1. 10%

  2. 20%

  3. 50%

  4. 80%
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

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. 

Multiple choice biology structural organization in living organisms structure of a plant cell levels of organisation in plants plant and animal cell

The secretory cells of the plants are

  1. <font color="#000000">Nectary cells</font>

  2. Hydathode

  3. Laticifer cells

  4. All of the above
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation
Nectaries secrete sweet liquid to attract and feed pollinators.
A hydathode is a type of secretory tissue in leaves, usually found in Angiosperms and peridophytes, that secretes water through pores in the epidermis or margin of leaves, typically at the tip of a marginal tooth or serration.
A laticifer is a type of elongated secretory cell found in the leaves and/or stems of plants that produce latex and rubber as secondary metabolites.
Thus, the correct answer is option D.
Multiple choice biology structural organization in living organisms structure of a plant cell levels of organisation in plants plant and animal cell

Most abundant element in plant body is 

  1. Potassium

  2. Nitrogen

  3. Carbon

  4. Hydrogen
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

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.

Multiple choice biology structural organization in living organisms structure of a plant cell levels of organisation in plants plant and animal cell

Growth of cell wall during cell elongation takes place by 

  1. Apposition

  2. Intussusception

  3. Both A and B

  4. None of the above
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

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.

Multiple choice biology structural organization in living organisms structure of a plant cell levels of organisation in plants plant and animal cell

Cell wall of plant cells is formed of 

  1. Cellulose

  2. Hemicellulose

  3. Proteins

  4. Fats
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The cell wall is a protective outer covering of the cell. It is mostly present in plant cells. It is not present in the animal cell. It supports the contents of the cell and protects from pathogen attack and wear and tear. It is made of cellulose. Cellulose is a natural polymer made of smaller sugar units. It gives remarkable strength to the wood. 

Multiple choice biology structural organization in living organisms structure of a plant cell levels of organisation in plants plant and animal cell

Which of the following is the characteristic of plants ________________.

  1. Glucose and cellulose

  2. Pyruvic acid and glucose

  3. Cellulose and starch

  4. Starch and pyruvic acid
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Cellulose is a structural polysaccharide found in the cell walls of plants.

Plant cell wall is required not only for the structure to determine the actual shape of cells and functional properties to control inner and outer cellular communication but also for overall growth and tree expansion. Cellulose is the most significant component of plant cell walls. 
Starch is an energy storage polysaccharide found in plants.Plants need energy to grow.They use energy from sunlight to make a simple sugar, glucose.Plants make polymers - starch - out of extra glucose,so it's right there when they need it.

Multiple choice biology structural organization in living organisms structure of a plant cell levels of organisation in plants plant and animal cell

Which of the following is absent in a plant cell?

  1. Centrosome

  2. Lysosomes

  3. Both A and B

  4. None of the above
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation
The centrosome is a microtubule-organizing centre. It is found near the nuclei of animal cells. Animal cells have another set of organelles which are not found in plant cells. These are lysosomes. The lysosomes are the cell's "garbage disposal." 
Multiple choice biology structural organization in living organisms structure of a plant cell levels of organisation in plants plant and animal cell

Animal cells do not have 

  1. Plastid

  2. Chloroplast

  3. Cell wall

  4. All of the above
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Plant and animal cells have several differences and similarities. For example, animal cells do not have a cell wall or chloroplasts but plant cells do. Animal cells are round and irregular in shape while plant cells have fixed, rectangular shapes.

Multiple choice biology structural organization in living organisms structure of a plant cell levels of organisation in plants plant and animal cell

Which of the following is a property of plants but not animals?

  1. Shape is irregular

  2. Plastids are usually absent

  3. Enclosed by a rigid cell wall

  4. All of the above
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The main difference between an animal cell and a plant cell is that plant cells have a cell wall, which the animal cells lack. The cell wall which is made up of cellulose gives the plant cell rigidity resulting in a fixed, rectangular shape. Animal cells lack the rigidity hence, they tend to have a round and irregular shape. Animal cells tend to vary greatly in appearance. The cell wall allows high pressure to build inside of the plant cell without bursting. Due to this, the plant cell is able to accept large amounts of liquid through osmosis without bursting. Animal cells, which only have a thin membrane restricting access to the cell, tend to burst if they absorb too much extra water.

Multiple choice biology structural organization in living organisms structure of a plant cell levels of organisation in plants plant and animal cell

Which of the following statements is true about the plant cell?

  1. The cytoplasm is filled up with nucleus

  2. The cytoplasm is a jelly-like mixture of cellulose

  3. Plant cells contain a rigid cell wall made up of cellulose

  4. There are plenty of chloroplast granules in plant root cells
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Cellulose forms an integral part of the cell wall which provides strength and rigidity to the cell. It helps to maintain the structural integrity of a particular cell. Cellulose is a complex polysaccharide which is made up of β(1→4) linked D-glucose units.

Thus, the correct answer is option C.