Tag: caskets of life

Quizzes (17) Questions (116)

Questions Related to caskets of life

Multiple choice biology caskets of life observation of cells observing cells cell as structural and functional unit

Which is useful for the study of a typical plant cell?

  1. Onion peel

  2. Onion leaves

  3. Onion root

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

An onion is a multicellular (consisting of many cells) plant organism. As in all plant cells, the cell of an onion peel have all the key characteristics of the plant cells such as cell wall, nucleus towards the plasma membrane, prominent and large centrally located vacuole. The presence of a cell wall and a large vacuole are indicators that help identify plant cells, such as seen in the onion peel.

Multiple choice biology caskets of life observation of cells observing cells cell as structural and functional unit

.......... is used as a colouring agent to colour the slide which is to be observed under the microscope.

  1. Water

  2. Iodine solution

  3. Hydrogen peroxide

  4. Chlorine
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation
Gram staining is the method for the identification of bacteria in which iodine solution is used. Iodine solution is directly applied on specimens, or it can be diluted first. Iodine solution makes a complex with carbohydrate or starch in cell and thus become visible under the microscope due to dark colouration.
Multiple choice biology caskets of life observation of cells observing cells cell as structural and functional unit

Onion cells and cheek cells are the examples of prokaryotic cell.

  1. True

  2. False
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Onion cell is a plant cell with a cell wall and a large vacuole. On the other hand, human cheek cell is an animal cell with a prominent nucleus. Onion cells are brick-like in shape while human cheek cells are rounded. Human cheek cells do not have a cell wall or a large vacuole. Onion cell is an example of plant eukaryotic cell and cheek cell is an example of an animal eukaryotic cell.

So, the correct answer is 'False'.

Multiple choice biology caskets of life observation of cells observing cells cell as structural and functional unit

When a student observed a stomatal epidermal peel under the microscope, it appeared pinkish red.
The stain used was :

  1. Iodine

  2. Methyl orange

  3. Safranin

  4. Methylene blue
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Safranin stains epidermal peel of leaf pinkish red in colour. Safranin is a biological stain used in histology and cytology. Safranin is used as a counterstain in some staining protocols, colouring all cell nuclei red. It can also be used for the detection of cartilage, mucin and mast cell granules.

Hence C is the correct option.

Multiple choice biology caskets of life observation of cells observing cells cell as structural and functional unit

How is a bacterial cell different from an onion peel cell?

  1. Bacterial cell- prokaryote, onion peel cell- eukaryote

  2. Onion peel cell- prokaryote, bacterial cell- eukaryote

  3. Bacterial cell- contains membranous organelles, onion peel cell- no membranous organelle

  4. None of these
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Bacterial cells are primitive cells hence, called as prokaryotic cells. They do not possess membrane bound organelles as mitochondria, lysosomes, etc. They also do not have well-defined membrane bound nucleus. 
Onion peel cell is an eukaryotic cell with well-defined membrane bound nucleus, membrane bound organelles as mitochondria, vacuole, etc. 

Multiple choice biology caskets of life observation of cells observing cells cell as structural and functional unit

Temporary mount of a peel is made in :

  1. Alcohol

  2. Water

  3. Glycerine

  4. Acetone
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation
Temporary mount of a leaf peel is used to observe stomata. Stomata are small openings found widely scattered on the epidermis of leaves and young stems.
Glycerine is a dehydrating agent. Once glycerine is added it forms a protective layer that keeps it moistened. It avoids the drying of the specimen. If staining is done after adding glycerine then the specimen will not be stained properly because the stain will be washed off with glycerine.
Hence C is the option. 
Multiple choice biology caskets of life observation of cells observing cells cell as structural and functional unit

Temporary mount of a peel is made in :

  1. Alcohol

  2. Water

  3. Glycerine

  4. Acetone
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation
Temporary mount of a leaf peel is used to observe stomata. Stomata are small openings found widely scattered on the epidermis of leaves and young stems.
Glycerine is a dehydrating agent. Once glycerine is added it forms a protective layer that keeps it moistened. It avoids the drying of the specimen. If staining is done after adding glycerine then the specimen will not be stained properly because the stain will be washed off with glycerine.
Multiple choice biology caskets of life observation of cells observing cells cell as structural and functional unit

A well stained leaf peel preparation when focussed under high power of the microscope would
show :

  1. epidermal cells, stomata and guard cells, each with one nucleus and many chloroplasts.

  2. epidermal cells, stomata and guard cells, each with many nuclei but one chloroplast.

  3. stomata and guard cells without nuclei or chloroplast.

  4. stomata but no guard cells or epidermal cells.
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
A well-stained leaf peel shows nuclei in a high power microscope. The leaf peel possesses stomata, guard cells and epidermal cells. The nuclei are present in both epidermal and guard cells, but stomata do not possess any nucleus.
So A is the correct option. 
Multiple choice biology caskets of life observation of cells observing cells cell as structural and functional unit

Given below are the steps in the preparation of a temporary mount of a stained leaf peel.
(i) Cover the material with the cover slip
(ii) Transfer the stained peel to a clean glass slide and add a drop of glycerine
(iii) Remove the peel from lower surface of leaf
(iv) Drop it in water in Petri dish and add a drop of  safranin stain.
The correct sequence of the experiment steps is

  1. (a) (iii), (iv), (ii), (i)

  2. (b) (i), (ii), (iii), (iv)

  3. (c) (ii), (iii), (iv), (i)

  4. (d) (iii), (iv), (i), (ii)
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

To prepare a leaf peel mount: first remove the peel (iii), place it in water/stain (iv), transfer to a slide with glycerine (ii), and finally apply the cover slip (i).

Multiple choice biology caskets of life observation of cells observing cells cell as structural and functional unit

Which one of the following organisms is correctly matched with its three characteristics?

  1. Onion: Bulb, Imbricate aestivation. Axile Placentation

  2. Maize, Closed vascular bundles, Scutellum
  3. Pea: $C _3$$ pathway, Endospermic, seed, Vexillary aestivation

  4. Tomato: Twisted aestivation, Axile placentation Berry
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
Onion belongs to the family Liliaceae. It is a modified stem which is present in the underground, called bulb. It shows imbricate aestivation in perianth. The gynoecium is in axile placentation. The above characteristics are matched with the characteristics of onion. 

Hence, the correct answer is option A.