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

Which of the following is true for endarch type of primary xylem?

Thyllakoid present

Fertilization of egg takes place inside

The leaf parts gets modified into spines in order to

How many Angiosperm species are face threat of extinction ?

Fill in the blanks and choose the correct option given below.
(i) The basidiospores are A produced on the basidium.
(ii) B are commonly known as imperfect fungi because only the asexual or vegetative phases of these fungi are known.
(iii) The deuteromycetes reproduce only by C spores known as conidia.
(iv) D and E shows dikaryon stage.
(v) F and G are examples of insectivorous plants and Cuscuta is a parasite.
(vi) The viruses are H organism that are characterized by having an inert crystalline structure outside the living cell.
(vii) The name virus that means venom or poisonous fluid was given by Pasteur. I showed that viruses could be crystallized and crystals consist largely of proteins.
(viii) Viruses are J parasites.
(ix) In general, viruses that infect plants have K and viruses that infect animals have either single or double stranded RNA or double stranded DNA.
(x) Bacterial viruses or bactriophages are usually L virus.
(xi) Viroids are smaller than viruses and caused M
(xii) The algal component is known as N and fungal component as mycobiont in lichens.

-Marked by terminalisation of chiasmata.

- Chromosomes are fully condensed.

- by the end of this stage, the nucleolus disappear.

Identify this stage.