From the following statements,select the wrong one:
- AMillipedes have two pairs of appendages in each segment of the body.
- BPrawn has two pairs of antennae.
- CAnimals belonging to phylum Porifera are exclusively marine.
- DNematocysts are characteristic of the phylum Cnidaria.
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What is the method of using predators for the control of pests called?
If $p \to ( \sim p \vee \sim q)$ is false,then the truth values of $p$ and $q$ are respectively.
Assertion $(A)$: $-NH_2$ group of aniline is ortho,para directing in electrophilic substitutions.
Reason $(R)$: $-NH_2$ group stabilises the arenium ion formed by the ortho,para attack of the electrophile.
The correct answer is
Reason $(R)$: $-NH_2$ group stabilises the arenium ion formed by the ortho,para attack of the electrophile.
The correct answer is
During implantation,the blastocyst becomes embedded in which layer of the uterus?
There are $9$ balls to be placed in $9$ boxes. If $5$ of the balls cannot fit into $3$ specific small boxes,find the number of ways of arranging one ball in each of the boxes.
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