Tag: botany

Questions Related to botany

The term chromosome was coined by

botany the mitotic cell cycle chromosome and its structure chromosome nucleus and chromosome

  1. Hofmeister

  2. Strasburger

  3. Waldeyer

  4. Laemli

Show answer
Correct Option: C
Explanation:
  • Chromosomes can be defined as thread-like structure which contains DNA and proteins which are found in the nucleus of most living cells.
  • They carry the genetic information in the form of genes.
  • The word chromosome is derived from the Greek word chroma meaning "colour" and soma meaning "body".
  • The term was coined by von Waldeyer-Hartz in relation to the term chromatin which was introduced by Walther Flemming.
  • So, the correct answer is 'Waldeyer'.

Term chromosome was coined by

botany the mitotic cell cycle chromosome and its structure chromosome nucleus and chromosome

  1. Hofmeister

  2. Sutton

  3. Boveri

  4. Waldeyer

Show answer
Correct Option: D
Explanation:

The term "chromosome" (comes from the Greek word "chroma" meaning colour and "soma" meaning "body", describing their strong staining by particular dyes) was first suggested in 1888 by the German anatomist Heinrich Wilhelm Gottfried von Waldeyer-Hartz.


So, the correct answer is 'Waldeyer'

Chromosome theory of inheritance was proposed by

botany the mitotic cell cycle chromosome and its structure chromosome nucleus and chromosome

  1. Sutton $(1902)$

  2. Boveri $(1902)$

  3. Both Sutton $(1902)$ and Boveri $(1902)$

  4. Correns $(1909)$

Show answer
Correct Option: C
Explanation:

Chromosome theory of inheritance or Boveri–Sutton chromosome theory is a fundamental unifying theory of genetics which identifies chromosomes as the carriers of genetic material

So, the correct answer is 'Both Sutton (1902) and Boveri (1902)'.

More than $200$ chromosomes occur in

botany the mitotic cell cycle chromosome and its structure chromosome nucleus and chromosome

  1. Chicken

  2. Dog

  3. Amoeba

  4. Gorilla

Show answer
Correct Option: C
Explanation:

1) Chicken has a diploid number of 78 (2n = 78).

2) Dog has a diploid number of 78 (2n=78).
3) The genome for Amoeba proteus is very large containing over 290 billion base pairs in its genome. The Amoeba proteus has more than 500 chromosomes in a single nucleus.
4) Gorilla has a diploid number of 48 (2n=48).
So, the correct answer is 'Amoeba'.

Chromosomes were first seen by

botany the mitotic cell cycle chromosome and its structure chromosome nucleus and chromosome

  1. Hofmeister

  2. Waldeyer

  3. Strasburger

  4. Flemming

Show answer
Correct Option: A
Explanation:

Wilhelm Friedrich Benedikt Hofmeister observed chromosomes in a dividing cell nucleus in 1848.


So, the correct answer is 'Hofmeister'

In a chromosome the protein content is?

botany the mitotic cell cycle chromosome and its structure chromosome nucleus and chromosome

  1. Nil

  2. Trace

  3. Half of DNA

  4. Same as DNA

Show answer
Correct Option: D

Kinetochore is?

botany the mitotic cell cycle chromosome and its structure chromosome nucleus and chromosome

  1. Surface of centromere

  2. Trilaminar plate over centromere

  3. End of chromosome

  4. Constriction near chromosome end

Show answer
Correct Option: A
Explanation:
The centromere is the lighter staining region on the chromosome of a cell which appears as a constriction.
They are also known as a primary constriction or kinetochore.
The kinetochore is a proteinaceous structure that assembles at the surface of the centromere which forms the site for binding of spindle fibres during cell division.
So, the correct answer is 'Surface of centromere'.

Is chromosome are the chromosomes with _____________.

botany the mitotic cell cycle chromosome and its structure chromosome nucleus and chromosome

  1. Identical sizes

  2. Identical arms

  3. Identical gene content

  4. Identical shapes

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Correct Option: A

Somatic chromosome number is 40.What shall be chromosome number in the cells seminiferous tubule ?

botany the mitotic cell cycle chromosome and its structure chromosome nucleus and chromosome

  1. 40

  2. 20

  3. 10

  4. 40 and 20

Show answer
Correct Option: B
Explanation:
Somatic cell is diploid (2n) in nature. It is given that the number of somatic chromosomes is 40. Seminiferous tubules contain haploid (n) spermatozoa. These spermatozoa are haploid in nature.
Hence, the number of chromosomes in the cells of seminiferous tubules will be 20.
Thus, the correct answer is '20.'

Separate identical copies of chromosomes are formed at the _______________.

botany the mitotic cell cycle chromosome and its structure chromosome nucleus and chromosome

  1. End of metaphase

  2. End of anaphase

  3. End of prophase

  4. End of zygotene

Show answer
Correct Option: A