Tag: diversity and classification in animals

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Multiple choice biology cell-the basic unit of life number and shape of cells unicellular and multicellular organisms cell parameters diversity and classification in animals

Which of the following statement are false?
(a) Most cells are tiny with volume range of $1-100$ $n{m}^{3}$
(b) Some cells have microvelli to increase the absorptive surface area.
(c) All cells arise from pre-existing cells.
(d) In plants, translocation of solutes is performed by xylem vessels and tracheids.
(e) According to cell theory, all cells arise from abiotic material.

  1. a), c) and e) are false.

  2. a), d) and e) are false.

  3. b), c) and d) are false.

  4. c), d) and e) are false.
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Statement (a) is false because cells are typically in the micrometer range, not nanometers. Statement (d) is false because translocation of solutes (phloem) is performed by phloem, not xylem. Statement (e) is false because cell theory states cells arise from pre-existing cells, not abiotic material.

Multiple choice biology cell-the basic unit of life number and shape of cells unicellular and multicellular organisms cell parameters diversity and classification in animals

A distinguishing feature of latex cells is that they are

  1. Single celled elements with anastomosing branches

  2. Single celled elements with nonanastomosing branches

  3. Multicelled elements with anastomosing branches

  4. Multicelled elements with nonanastomosing branches.
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Latex cells (laticifers) are classified into two types: simple (non-articulated) laticifers, which are single-celled and non-anastomosing, and compound (articulated) laticifers, which are multi-celled and often anastomosing.

Multiple choice biology cell-the basic unit of life number and shape of cells unicellular and multicellular organisms cell parameters diversity and classification in animals

Which amongst the following is more complex in body plan, from evolution point of view?

  1. Bacteria

  2. Human

  3. Both have same complexity

  4. Data insufficient
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

If the appearance of complexity is concurrent with evolution then, human beings are more evolved and complex than bacteria. Humans are the multicellular organism with the well-developed brain. Bacteria is the primitive unicellular organism.

Multiple choice biology cell-the basic unit of life number and shape of cells unicellular and multicellular organisms cell parameters diversity and classification in animals

safranin stains

  1. Thick walled cells

  2. Lignified cells

  3. Suberized cells

  4. LIving cells
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Safranin is a biological stain composed of azonium compounds, which is utilized to study histology and cytology. In particular, safranin stains lignified tissues like xylem even in the presence of cellulose particles. Fluorescent safranin staining is useful to stain the cell wall of woody plants and produce green or yellow fluorescence in the secondary cell wall and red or orange fluorescence in the middle lamella region under a fluorescent microscope. 

So, the correct answer is option B, Lignified cells. 

Multiple choice biology cell-the basic unit of life number and shape of cells unicellular and multicellular organisms cell parameters diversity and classification in animals

The longest living cells amongst the following are

  1. RBC

  2. B cells

  3. T cells

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

All cells usually have a fixed life span. The cells divide for a certain period of time, after which they die. This has been explained by the phrase "programmed cell death". The lifespan of each type of the body cells differ and it depends on the function it is destined to perform. Neurons are long lived and are generally non-mitotic. Memory T cells and memory B cells can provide long lasting immunity from exposure to antigens, they too are long lasting but their life span is less than that of a neuron.

The lifespan of RBC is shortest amongst the options which are given, it is 115 days. Thus, the correct answer is option D.

Multiple choice biology cell-the basic unit of life number and shape of cells unicellular and multicellular organisms cell parameters diversity and classification in animals

The largest cell measuring .........., is the egg of an ostrich.

  1. 130 mm-150 mm

  2. 130 mm-180 mm

  3. 130 mm-170 mm

  4. 170 mm-190 mm
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The cell is the structural unit of life and its size ranges from 0.5 micrometers to 100 micrometers. An egg of ostrich is a single-celled structure and know as the largest cell in the world with the size of 130 mm-170 mm. Thus, the correct answer is option C.

Multiple choice biology cell - the structural and functional unit of life number and shape of cells unicellular and multicellular organisms diversity and classification in animals

A plant in which food stored in the form of Laminarin-

  1. Volvox

  2. Chara

  3. Ectocarpus

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

Ectocarpus is a brown alga (Phaeophyceae) in which food is stored in the form of complex carbohydrates such as laminarin and mannitol. Volvox stores food as starch, and Marchantia is a bryophyte.