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

Which given character is true for nitrogen bases found in living organism ?
(i) Adenine, guanine, cytosine, uracil and thymine are nitrogen bases.
(ii) When nitrogen base is attached to a sugar, they are called nucleosides.
(iii) If a phosphate group is also found esterified to the sugar of nucleosides then they are called nucleotides.
(iv) Adenosine, guanosine, thymidine, uridine and cytidine are nucleotides.
(v) Adenylic acid, thymidylic acid, guanylic acid. uridylic acid and cytidylic acid are nucleosides.
(vi) Nucleic acids like DNA and RNA consist of nucleotides only.

In plants, the tumour inducing plasmid (Ti) ofAgrobacterium tumefaciens is used as a cloning vector. This statement is

Generally hypodermis in monocots is composed of

Group of orders is called........

Assertion: If hybrids are made into apomicts, there is no segregation of characters in the hybrid progeny.
Reason: The farmers can keep on using the hybrid seeds to raise new crop year after year and he does not have to buy hybrid seeds every year.

Fruits in Asteraceae are generally dispersed by

The most common shape of pyramid of number is

Leaf abscission, fruit fall, and bud dormancy occurs by which phytohormone?