Which one of the following is correct?
Which one of the following is correct?
- A
Herbicides kill plant mostly by blocking $PS-II$ (photolysis of water) and occasionally phloem transport
- B
Insecticides kill insects mostly through impairment of nerve conduction and sometimes through respiratory arrest
- C
Both $(a)$ and $(b)$
- D
None of the above
Similar Questions
The pesticide used in foundations of buildings for preventing termite attack is
The pesticide used in foundations of buildings for preventing termite attack is
Match the following (column$-I$ with column$-II$)
Column $I$ (Microbes)
Column $II$ (Organic acid)
$a.$ Aspergillus niger
$(i)$ Butyric acid
$b.$ Clostridium butylicum
$(ii)$ Citric acid
$c.$ Acetobacter aceti
$(iii)$ Lactic acid
$d.$ Lactobacillus
$(iv)$ Acetic acid
Match the following (column$-I$ with column$-II$)
| Column $I$ (Microbes) | Column $II$ (Organic acid) |
| $a.$ Aspergillus niger | $(i)$ Butyric acid |
| $b.$ Clostridium butylicum | $(ii)$ Citric acid |
| $c.$ Acetobacter aceti | $(iii)$ Lactic acid |
| $d.$ Lactobacillus | $(iv)$ Acetic acid |
Consider the following four statements $(A-D)$ and select the option which includes all the correct ones only.
$(A)$ Single cell Spirulina can produce large quantities of food rich in protein, minerals, vitamins, etc.
$(B)$ Body weightwise the microorganism Methylophilus methylotrophus may be able to produce several times more proteins than the cows per day.
$(C)$ Common button mushrooms are a very rich source of vitamin $C$.
$(D)$ A rice variety has been developed which is very rich in calcium.
Consider the following four statements $(A-D)$ and select the option which includes all the correct ones only.
$(A)$ Single cell Spirulina can produce large quantities of food rich in protein, minerals, vitamins, etc.
$(B)$ Body weightwise the microorganism Methylophilus methylotrophus may be able to produce several times more proteins than the cows per day.
$(C)$ Common button mushrooms are a very rich source of vitamin $C$.
$(D)$ A rice variety has been developed which is very rich in calcium.
- [AIPMT 2012]
The two natural insecticides used before $1940$
The two natural insecticides used before $1940$
Free living nitrogen fixing bacteria can bring about saving of nitrogen fertilizer to the tune of
Free living nitrogen fixing bacteria can bring about saving of nitrogen fertilizer to the tune of