Biology - Study Mode

[#311] Example of a single celled organism.
Correct Answer

(D) All of the above

Explanation

Solution: Algae, Amoeba and Paramaecium all are single celled organism.

[#312] Chlamydomonas prefers water rich in
Correct Answer

(A) Ammonic compounds

Explanation

Solution: Chlamydomonas is widely distributed in freshwater or damp soil. It is generally found in a habitat rich in ammonium salt.

[#313] The number of pyrenoids in a cell of Spirogyra is
Correct Answer

(D) Numerous

Explanation

Solution: The biological parameters, which included cell width, cell length, number of chloroplast spirals, and number of pyrenoids, ranged from 40 to 90 μm, 85 to 263 μm, 5.5 to 16 spiral, and 50 to 240 pyrenoids, respectively.

[#314] Nuclear membrane is absent in
Correct Answer

(D) Nostoc

Explanation

Solution: Penicillium and Agaricus are fungi while Volvox is an alga. All three are eukaryotes thus have a membrane bound nucleus. Nostoc is a cyanobacterium, i.e., prokaryote, so it lacks true nucleus, thus nuclear membrane is absent.

[#315] Microscopic organism which passively float on the surface of water is called
Correct Answer

(C) Both (a) and (b) both

Explanation

Solution: Microscopic organism which passively float on the surface of water is called Zooplanktons and Phytoplanktons.