STD 11 - 8. Cell the unit of life — NEET STD 11 Science — Question

What happens when auxin is applied to the tip of a cut stump

Which of the following is key features of meiosis ?
(i) Meiosis involves two sequential cycles of nuclear and cell division called meiosis-I and meiosis-II.
(ii) Meiosis-I is initiated after the parental chromosomes have replicated to produce identical sister chromatids at the S-phase.
(iii) Meiosis involves pairing of homologous chromosomes and recombination between them.
(iv) Four haploid cells are formed at the end of meiosis-II.
(v) Two cycle of DNA replication occurs.

In one meiotic cell division, the cell divides

Which factor determines the direction of movement of main root and stem?

Which of the following structures controls the transport of the material into and out of living cells

Which one is a wrong statement?

Which of the following is called "filterable agent''

Read the following and choose the option with all incorrect statements.
(A) Cynobacteria can live as symbionts in association with algae as lichens and with roots of higher plants as mycorrhiza.
(B) Albugo is a parasitic fungi on mustard.
(C) Mycelium is aseptate and coenocytic in basidiomycetes.
(D) Ascomycetes growing on cattle dung are called coprophilous.
(E) Fusion of protoplasms between two motile or non-motile gametes is called plasmogamy.
(F) In phycomycetes, asexual reproduction takes place by zoospores and aplanospores.
(G) Ascomycetes are commonly known as fungi imperfecti.
(H) Albugo, Mucor belong to phycomycetes group of fungi.
(I) In phycomycetes asexual reproduction take place by motile spore called zoospores or by non-motile spores called aplanospores.
(J) Asexual spores called ascospore are produced in ascomycetes.
(K) Neurospora and Claviceps belong to phycomycetes.
(L) In basidiomycetes, asexual spores are generally not found, but vegetative reproduction by fragmentation is common.
(M) In basidiomycetes, sex organ are present but plasmogamy is brought about fusion of two vegetative or somatic cells of different strains or genotypes.