Tag: multicellular organisms

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Questions Related to multicellular organisms

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

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. $0.02-0.2\mu m$

  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
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Typical bacteria are 1-2 micrometers (I-B), Viruses are 0.02-0.2 micrometers (II-D), PPLO are 0.1 micrometers (III-C), and typical eukaryotic cells are 10-20 micrometers (IV-A).

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

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.

  1. One

  2. Two

  3. Three

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

Only statement (C) is correct. (A) Primordial germ cells are diploid (2n). (B) Spermiogenesis occurs in the seminiferous tubules, not the epididymis. (D) The corpus spongiosum is not covered by tunica albuginea (the corpora cavernosa are).

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

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

  1. Algae

  2. Fungi

  3. Bacteria

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

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

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

  1. Aerobic respiration

  2. DNA replication

  3. RNA synthesis

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

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

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

  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.
Reveal answer Fill a bubble to check yourself
C Correct answer
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.

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

Which one of the following is the smallest in size?

  1. Bacteria

  2. Mitochondrion

  3. Mammalian cell

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

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

Cells of multicellular organism are usually________________

  1. Triangular

  2. Rectangular

  3. Polyhedral

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

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

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

  1. Acellular

  2. Unicellular

  3. Multicellular

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