alleryStart learning →2,4-D works as a herbicide because it kills which plants?
- Monocot crops
- Gymnosperms
- Dicot weeds
- All grasses
Show answer and solution
Correct answer: C. Dicot weeds
2,4-D kills dicot weeds without harming monocot crop plants such as cereals.
MHT-CET Plant Growth and Mineral Nutrition — practice questions — page 2
Explore 87 free Plant Growth and Mineral Nutrition questions in MHT-CET Biology. Open each question or exercise to read its content, reference answers and available explanation.
Practise Plant Growth and Mineral Nutrition with Quill →Plant Growth and Mineral Nutrition questions and exercises with answers
Showing questions 31–60 of 87.
2,4-D works as a herbicide because it kills which plants?Read the answer and worked solution →A foliar spray of NAA and 2,4-D induces flowering in which plants?Read the answer and worked solution →Agent orange, used in the Vietnam war, was a mixture of which two compounds?Read the answer and worked solution →Gibberellins were first isolated from which fungus?Read the answer and worked solution →Infected rice plants show extensive stem elongation known as?Read the answer and worked solution →Crystalline gibberellin was obtained from the fungus culture by whom?Read the answer and worked solution →Which is the most common biologically active gibberellin?Read the answer and worked solution →Gibberellins and abscisic acid are both synthesised from which compound?Read the answer and worked solution →Gibberellin treatment converts which type of plant to a tall one?Read the answer and worked solution →Elongation of internodes before flowering in beet and cabbage is called?Read the answer and worked solution →Gibberellin promotes germination of barley seeds by synthesising which enzyme?Read the answer and worked solution →Which hormone application overcomes the need for vernalization?Read the answer and worked solution →Which hormone increases the bunch length of grapes?Read the answer and worked solution →Who discovered the first cytokinin, kinetin, in 1954?Read the answer and worked solution →Which is the first natural cytokinin, obtained from unripe maize grains?Read the answer and worked solution →Which is a synthetic cytokinin?Read the answer and worked solution →A high cytokinin to auxin ratio in culture promotes what?Read the answer and worked solution →Which hormone delays senescence of plant organs?Read the answer and worked solution →Which hormone reverses the effect of apical dominance?Read the answer and worked solution →Which plant growth regulator is gaseous?Read the answer and worked solution →Which hormone is used to ripen bananas and mangoes?Read the answer and worked solution →Drooping of leaves and flowers caused by ethylene is called?Read the answer and worked solution →Ethylene inhibits flowering in most plants except which one?Read the answer and worked solution →Ethylene causes degreening of citrus by raising which enzyme's activity?Read the answer and worked solution →Abscisic acid that induces bud dormancy in Acer was named?Read the answer and worked solution →Chemically, abscisic acid is a compound of how many carbon atoms?Read the answer and worked solution →Which hormone acts as an antitranspirant by closing stomata?Read the answer and worked solution →Which hormone is called the plant stress hormone?Read the answer and worked solution →Which organ receives the photoperiodic stimulus?Read the answer and worked solution →The hormonal flowering stimulus moved through phloem is called?Read the answer and worked solution →
Worked practice questions
A foliar spray of NAA and 2,4-D induces flowering in which plants?
- Cabbage and beet
- Wheat and barley
- Litchi and pineapple
- Maize and rice
Show answer and solution
Correct answer: C. Litchi and pineapple
Auxin sprays are used to induce flowering in litchi and pineapple.
Agent orange, used in the Vietnam war, was a mixture of which two compounds?
- IBA and kinetin
- 2,4-D and 2,4,5-T
- GA3 and ABA
- IAA and NAA
Show answer and solution
Correct answer: B. 2,4-D and 2,4,5-T
Agent orange combined the phenoxy herbicides 2,4-D and 2,4,5-T and was used to defoliate forests.
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