- Aegg has a filiform apparatus
- Bthere are numerous antipodal cells
- ✓reduction division occurs inthe megaspore mother cells
- Da small central cell is present in that embryo sac.
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$(i)$ Bacillus thuringiensis are available in sachets as dried spores which are mixed with kerosine and sprayed on to vulnerable plants
$(ii)$ B. thuringiensis are used to control butterfly caterpillars, but leave other insects unharmed
$(iii) $ The toxin of B. thuringiensis is released in the blood of larvae and the larvae get killed
$(iv)$ By the development of methods of genetic engineering B. thuringiensis toxin genes have been introduced
$a.$ Dry weight $b.$ Fresh weight
$c.$ Volume $d.$ Cell number
$(i)$ Most of them are fresh water organisms found in standing water.
$(ii)$ They have a protein rich layer (called pellicle) which makes their body flexible.
$(iii)$ They have two flagella, a short and a long one.
$(iv)$ Though they are photosynthetic in the presence of sunlight, but in the absence of sunlight they behave like heterotrophs by predating on other smaller organisms. Identify the correct group on the basis of these characters.