Tag: botany

Quizzes (264) Questions (5276)

Questions Related to botany

Multiple choice botany biotechnology: principles and processes manipulation of dna electrophoresis isolation and separation of dna

A technique utilized by a group of biologists to isolate an antifreeze gene found in cold water species of fish and introduce it into the genome of a different organism is called as 

  1. Cloning

  2. Artificial selection

  3. Selective breeding

  4. Genetic engineering

  5. Sexual recombination
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation
Genetic engineering is the branch of science which deals with the modification of genes. The desired genes is isolated from the host like the gene for antifreeze protein and are inserted into the vectors. The vectors carries the foreign gene into the desired organism like the fish and then the gene gets introduced into the genome of fish, resulting in the production of the protein.
Thus, the correct answer is option 'Genetic engineering'.
Multiple choice botany the leaf mechanism of absorption mineral absorption significance of transpiration

Match List-I with List-II and select the correct answer.

List-I List-II
a. when the leaf is rolled from one margin to the other $1$. Centuplicate
b. When the leaf is rolled from the apex towards the base $2$. Convolute
c. When upper half of the lower half $3$. Criminate
d. When the leaf is folded lengthwise along the midrib $4$. Replicate
  1. A-$1$, B-$2$, C-$3$, D-$4$
  2. A-$2$, B-$1$, C-$4$, D-$3$
  3. A-$3$, B-$2$, C-$1$, D-$4$
  4. A-$2$, B-$3$, C-$4$, D-$1$
Reveal answer Fill a bubble to check yourself
A Correct answer
Multiple choice botany the leaf mechanism of absorption mineral absorption significance of transpiration

Which of the following is not the modification of leaf?

  1. Tendril in Antigonon

  2. Tendril in Clematis

  3. Tendril in Gloriosa

  4. Tendril in Nepenthes
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

In Antigonon, the tendril is a modification of the inflorescence axis, not the leaf. In Clematis, Gloriosa, and Nepenthes, the tendrils or traps are modifications of leaves or leaflets.

Multiple choice botany the leaf mechanism of absorption mineral absorption significance of transpiration

Choose the correct answers from the alternatives given.
One important difference between the anatomy and physiology of roots and leaves is that

  1. Unlike roots, the xylem vessels in leaves normally transport sap in both directions

  2. A waxy cuticle covers most leaves but is absent in roots

  3. Leaves, but not roots, have ground tissue consisting mainly of parenchyma cells

  4. Phloem always conducts sap away from leaves and toward roots
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The leaves are covered with waxy cuticle but roots do not possess any cuticle. Cuticle helps in preventing loss of water from the surface of the leaves. Since roots are present underground immersed in the soil they do not show transpiration and hence no cuticle is present. 

Hence, the correct answer is 'A waxy cuticle covers most leaves but is absent in roots'.

Multiple choice botany breeding and biotechnology branches of biotechnology gene cloning biotechnology and genetic engineering

Genetic engineering is possible because 

  1. DNA can be cut at specific sites by endo nucleases like DNAase

  2. Restriction endonucleases purified from bacteria can be used in vitro

  3. The phenomenon of transduction in bacteria is well understood

  4. DNA can be seen by electron microscope
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Genetic engineering is the technique by which the genetic material of an organism is manipulated. The desired genes from any organism are isolated and are transferred into the organism where those genes are expressed and desired products are obtained. Manipulation of an organism's genome is not a simple process and involves a number of tools including restriction enzymes. 

Restriction enzymes are the most important tools in genetic engineering. They make cuts in the DNA at specific positions. They may be exonuclease if they make cut at the end of DNA or endonuclease if they make cut within the DNA. Restriction endonucleases cut the DNA into fragments like DNAsse. The fragments of DNA are then jouned by DNA ligases. 

So, the correct answer is 'DNA can be cut at specific sites by endo nucleases like DNAase'.