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

In which phase of mitosis the chromosomes are arranged around the equator of the spindle

Which phytohormone has viral inhibitory property?

Sieve tubes have

In the mountains, there is a lot of moisture and water and still the plants are xerophytes, because

In glycolysis, a chain of ten reactions, under the control of different enzymes, takes place to produce pyruvate from glucose. What is the true sequence ?
(i) Glucose-6-phosphate.
(ii) Fructose-6-phosphate.
(iii) Fructose 1,6-bisphosphate.
(iv) Dihydroxyacetone phosphate and 3-phosphoglyceraldehyde (PGAL).
(v) 2-Phosphoglycerate
(vi) 1,3-bisphosphoglycerate (BPGA).
(vii) 3-phosphoglycerate

Genetically dwarf plants can be induced to grow tall by using

Assertion: Leaf develops at the node and bears a bud in its axil.
Reason: Leaves of dicotyledonous plants generally possess parallel venation.

Arrange the following in proper sequence as occurring in z-scheme :
(1) Excitation of electrons of PS-II.
(2) Down hill transfer of electrons to PS-I.
(3) Excitation of electrons and transfer to another acceptor.
(4) Uphill transfer of electrons to acceptor.
(5) Down hill transfer of electrons causing NADP⁺ to reduce into NADPH+H⁺.

Mature embryo sac contains or A normal angiosperm embryo sac at the final stage of development has