The plant hormone used to destroy weeds in a field is
The plant hormone used to destroy weeds in a field is
IBA
IAA
NAA
2, 4-D
The Correct Option is D
Solution and Explanation
The question asks which plant hormone is used to destroy weeds in a field. Let's analyze the given options:
- IBA (Indole-3-butyric acid): This is a plant hormone used primarily as a rooting agent in plant propagation. It is not used for weed control.
- IAA (Indole-3-acetic acid): Another type of auxin similar to IBA, primarily used to regulate plant growth rather than weed control.
- NAA (Naphthaleneacetic acid): This is also an auxin known for its roles in plant growth, including rooting and fruit set, but it is not specifically used for destroying weeds.
- 2, 4-D (2,4-Dichlorophenoxyacetic acid): This is a synthetic auxin and a widely used herbicide, designed specifically to kill broadleaf weeds. It mimics natural growth hormones in plants, causing uncontrolled and disorganized growth that ultimately leads to the weed's death.
From these options, we can conclude that the correct answer is 2, 4-D, as it is specifically used to destroy weeds in agriculture and gardening settings.
Therefore, the correct option is 2, 4-D.
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Concepts Used:
Principles of Inheritance and Variation - Mutation
A Mutation is a change in the sequence of our DNA base pairs caused by numerous environmental stimuli such as UV light or mistakes during DNA replication. Germline mutations take place in the eggs and sperm and can be passed onto offspring, whereas somatic mutations take place in body cells and are not passed on.
Types of Mutations
There are three types of mutations, which are as follows:
Silent mutation
It refers to any change in DNA sequence that has no effect on the amino acid sequence in a protein or the functions that a protein performs. There is no phenotypic indication that a mutation has occurred.
Nonsense mutation
When there is a change in the sequence of base pairs due to a point mutation, that results in a stop codon. This leads to a protein that is either shortened or non-functional.
Missense mutation
A missense mutation occurs when a point mutation causes a change in the codon, which then codes for another amino acid.
The mutation is caused by the following factors:
Internal Causes
When DNA copies incorrectly, the majority of mutations occur. Evolution occurs as a result of all of these mutations. DNA makes a copy of itself during cell division. When a copy of DNA isn't flawless, it's called a mutation since it differs somewhat from the original DNA.
External Causes
When certain chemicals or radiations are used to break down DNA, it causes the DNA to break down. The thymine dimers are broken by UV radiation, resulting in altered DNA.