STD 12 - 12. ecosystem — NEET STD 11 Science — Question

Transfer of any gene into a completely different organism can be done through

In gymnosperm the microspores develop into a male gametophyte generation which

Which one of the following statements are correct ?
(i) Chrysophytes group includes diatoms and dinoflagellates.
(ii) In diatoms, a member of Chrysophytes, the cell wall form two thin overlapping shells, that fit together as in a soap box.
(iii) Diatoms leave behind large amount of cell wall deposits in their habitat; this accumulation over billions of years is referred to as 'diatomaceous earth'.
(iv) Diatoms are the chief producers in the ponds.
(v) Dinoflagellates organisms are mostly marine and photosynthetic.
(vi) Euglenoids are fresh water organism found in stagnant water. Instead of a cell wall, they have a protein rich layer called pellicle which makes their body flexible.
(vii) Slime moulds are saprophytic fungi.
(viii)Under suitable conditions, slime moulds form an aggregation called plasmodium which may grow and spread over several feet.
(ix) There are four major groups of protozoans.
(x) Sleeping sickness is caused by a ciliated protozoan trypanosoma.
Choose the correct option given below:-

Choose incorrect pair.

Select the event that is unique to flowering plants.

Most common fruits of fabaceae and brassicaceae are respectively

Cell elongation in plants is caused by

Trabaculae is the transformation of