STD 11 - 13. Plant growth and development — NEET STD 11 Science — Question

The correct floral formula of soyabean is

Virus that infects bacteria is called

Member of auxin, which is widely used to kill the dicotyledonous weed is

Which of the following is most important abiotic factor in pond ecosystem

Mark the given statements True (T) or False (F).
(i) Any sexually reproducing organism starts its life cycle from a single-celled zygote.
(ii) The stages through which a cell passed from one division to the next is called cell cycle.
(iii) Yeast progresses through the cell cycle in 190 minute.
(iv) The cell cycle is divided into two phase interphase and M-Phase.
(v) Nuclear division is known as karyokinesis while cytoplasm division is known as cytokinesis.
(vi) In cell cycle, the resting phase during which cell is preparing for cell division is called interphase.
(vii) G₂ phase of M-phase is period when cell grows and carries out normal metabolism.
(viii) During S phase of interphase, amount of DNA per cell doubles.
(ix) If the cell has 2n number of chromosome at G₁ then number of chromosome after S phase will be 4n.
(x) G₀ phase of cell cycle is called quiescent stage.
(xi) During prophase phase of M-phase of cell cycle, duplicated centriole begins to move towards metaphase plate.
(xii) Kinetochores structure on surface of centromere serve as the sites of attachment of spindle fibres to the chromosome.
Choose the correct option given below :-

Plant fibres can originate from

Algae are important, we should study algae because

For the observation of Kranz anatomy which plant is useful?

Acetabularia is a