Tag: multicellular organisms

Questions Related to multicellular organisms

Match the column I with column correctly.

Column I Column II
Various types of cell and organism Size
I. Typical bacteria A. $10-20\mu m$
II. Viruses B. $1-2\mu m$
III. PPLO C. $0.1\mu m$
IV. A typical eukaryotic cells D. $0.02-0.2\mu m$
botany caskets of life the cell structure multicellular organisms number and shape of cells

  1. I-B, II-D, III-C, IV-A

  2. I-A, II-B, III-C, IV-D

  3. I-D, II-C, III-B, IV-A

  4. I-B, II-D, III-A, IV-C

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Correct Option: A

How many statements is/are correct?
(A) Premordial germ cells are $2$n in nature.
(B) Spermipgenesis occurs in epididymis.
(C) Galea capitis is cap like structure found at head of sperm.
(D) Corpus spongiosum is covered by tunica albuginea.

botany caskets of life the cell structure multicellular organisms number and shape of cells

  1. One

  2. Two

  3. Three

  4. Four

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Correct Option: A

Which of the following is incorrectly match?

botany caskets of life the cell structure multicellular organisms number and shape of cells

  1. For fully turgid cell $\Rightarrow$ DPD $=0$

  2. DPD of solution in vessel $\Rightarrow$ OP $-$ TP

  3. For full turgid cell $\Rightarrow$ OP $=$ TP

  4. DPD for a flaccid cell $\Rightarrow$ DPD $=$ OP

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Correct Option: A

Which of the following is an exception with either RNA or DNA in the cell as genetic material ? 

botany caskets of life the cell structure multicellular organisms number and shape of cells

  1. Algae

  2. Fungi

  3. Bacteria

  4. Viruses

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Correct Option: D
Explanation:

Viruses are an exception to cell theory as it is an acellular organism that is living inside the host and nonliving outside the host. In viruses, only one nucleic acid (DNA or RNA) is present. Thus, a virus can be either a DNA virus or an RNA virus. Viruses infecting animals usually have DNA as genetic material. Viruses infecting plants usually have RNA as genetic material. All eukaryotic cells have both DNA and RNA in their cells.

The mature cells in the mammalian body, i.e., RBC loses their capacity for

botany caskets of life the cell structure multicellular organisms number and shape of cells

  1. Aerobic respiration

  2. DNA replication

  3. RNA synthesis

  4. All of the above

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Correct Option: D
Explanation:

Nucleus is double membrane covered protoplasmic body that contains hereditary information. A nucleus is absent in some mature cells like mammalian RBCs and sieve tube cells in plants. They are called as enucleate cells. In mammals, erythrocytes also lose all other cellular organelles such as their mitochondria, Golgi apparatus and endoplasmic reticulum. As a result of not containing mitochondria, these cells use none of the oxygen they transport; instead they produce energy by glycolysis of glucose and lactic acid fermentation of the resulting pyruvic acid.

Thus, the correct answer is option D.

Which of the folwing statement can be related to 'It is said that every multicellular organism has come from a single cell'?

botany caskets of life the cell structure multicellular organisms number and shape of cells

  1. Every organism starts its life from a zygote, a single cell.

  2. Cells divide to produce cells of their own kind and thus, all cells of the body come from the pre-existing cells.

  3. Both A and B.

  4. None of the above.

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Correct Option: C
Explanation:

All the multicellular organisms start their life with a single cell (zygote). Later, it is divided and differentiated into different cell types in multicellular organisms. Cells are capable of dividing to form their own kind of cells. Thus, all cells of the body come from the pre-existing cells. Thus, the correct answer is option C.

Which one of the following is the smallest in size?

botany caskets of life the cell structure multicellular organisms number and shape of cells

  1. Bacteria

  2. Mitochondrion

  3. Mammalian cell

  4. Virus

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Correct Option: D
Explanation:

The average diameter of bacteria is 0.2 to 2 micrometer. 
Mitochondrion size is 0.5 to 10 micrometer. 
The average diameter of a mammalian cell is 20 micrometer. 
Virus diameter ranges from 20 nanometers to 250-400 nanometer. 1000 nanometer = 1 micrometer. Hence, the virus particle is the smallest of all.

Cells of multicellular organism are usually________________

botany caskets of life the cell structure multicellular organisms number and shape of cells

  1. Triangular

  2. Rectangular

  3. Polyhedral

  4. None of these

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Correct Option: C
Explanation:

Cells of unicellular organisms are usually spherical due to surface tension. 
Cells of the multicellular organism are usually polyhedral. Because polyhedral cells have more neighbors which means more intercellular exchange can occur. Also, the polyhedral group of cells resists stretching to a more extent. 

The life of .......... organisms start with a zygote.

botany caskets of life the cell structure multicellular organisms number and shape of cells

  1. Acellular

  2. Unicellular

  3. Multicellular

  4. All of the above

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Correct Option: C
Explanation:

In unicellular, reproduction occurs asexually and two new identical daughter cells that are produced. All multicellular start their life from a single cell i.e., zygote which is a product of the fusion (fertilization) of usually two haploid gametes, a female and a male gamete. The zygote (diploid) divide to give rise huge variety of different types of cell, specialized for different functions which in turn forms multicellular organism.

In multicellular organisms, cell size is 

botany caskets of life the cell structure multicellular organisms number and shape of cells

  1. 10-100 micrometer

  2. 100-1000 micrometer

  3. 200-500 micrometer

  4. 300-800 micrometer

Show answer
Correct Option: A
Explanation:

Cell size in unicellular organisms is 0.5-10 micrometer whereas, in multicellular organisms, cell size is 10-100 micrometers.

Hence, the correct option is A.