Tag: biology

Questions Related to biology

The smallest animal egg is that of

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

  1. Ostrich

  2. Human female

  3. Duck

  4. Hen

Show answer
Correct Option: B
Explanation:

The egg size of Ostrich egg is 15cm, duck egg is typically larger than hen eggboth of which are roughly between 3-10cm. Human female egg is very small about 1-2cm and hence the smallest egg among all other options.

Largest animal cell is that of

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

  1. Ostrich.

  2. Duck.

  3. Human.

  4. Hen.

Show answer
Correct Option: A
Explanation:
Multicellular eukaryotes have a cell size in the range of 5 to 100μm. Largest cells are animal eggs. Largest egg of a land animal is that of ostrich (17 cm x 15 cm), while for an aquatic animal, it is that of whale shark (30 cm in diameter).
Thus, the correct answer is option A.

Efficient large-sized cells should be_________.

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

  1. Elongated.

  2. Branched.

  3. With membrane extensions.

  4. Any of the above.

Show answer
Correct Option: D

Size of Acetobularia is

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

  1. $10cm$

  2. $10mm$

  3. $1.0mm$

  4. $0.1mm$

Show answer
Correct Option: A
Explanation:

Acetabularia is a single-celled eukaryotic photosynthetic green alga. Although it is single cells it has a complex structure with size varying from 0.5-10cm. It is divided into three anatomical parts with basal rhizoid like structure resembling roots, long stalk-like structure and top umbrella that may fuse to form the cap.  

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.

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

  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.

Show answer
Correct Option: B

Assume a spherical mammalian cell has a diameter of 27 microns. If a polypeptide chain with alpha helical conformation has to stretch across the cell, how many amino acids should it be comprised of?

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

  1. 18000

  2. 1800

  3. 27000

  4. 12000

Show answer
Correct Option: A

A distinguishing feature of latex cells is that they are

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

  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.

Show answer
Correct Option: B

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

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

  1. Bacteria

  2. Human

  3. Both have same complexity

  4. Data insufficient

Show answer
Correct Option: B
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.

safranin stains

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

  1. Thick walled cells

  2. Lignified cells

  3. Suberized cells

  4. LIving cells

Show answer
Correct Option: B
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. 

The longest living cells amongst the following are

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

  1. RBC

  2. B cells

  3. T cells

  4. Neurons

Show answer
Correct Option: D
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.