Genetics And Plant Breeding - Study Mode

[#461] Aflatoxins are produced by
Correct Answer

(B) Fungi

Explanation

Solution: Aflatoxins are produced by fungi. Aflatoxins are a family of toxins produced by certain fungi that are found on crops such as maize (corn), peanuts, cottonseed, and tree nuts. The main fungi that produce aflatoxins are Aspergillus flavus and Aspergillus parasiticus, which are abundant in warm and humid regions of the world.

[#462] In maize, cross pollination occurs due to
Correct Answer

(A) Protandry

Explanation

Solution: In maize, cross pollination occurs due to Protandry. When the pistil matures before anthers, it is called protogyny such as in pearl millet. When anthers mature before the pistil, it is known as protandry. Protandry occurs in small, stable groups with essentially a monogamous relationship between one pair that reproduces. The largest males change sex, becoming females, and large females produce the greatest number of eggs.

[#463] The legumes have flower
Correct Answer

(D) Diadelphous

Explanation

Solution: The legumes have flower Diadelphous. Diadelphous is having its stamens fused at least partly by the filaments so that they form two separate bundles, or a bundle and a lone separate stamen. Each flower consists of five petals: a large banner, two lateral wings, and a keel formed by two fused petals. The keel petals enclose the 9 stamens (androecium) and pistil (gynoecium).

[#464] Which one is the shortest phase during cell cycle?
Correct Answer

(D) M

Explanation

Solution: The The M phase is the shortest phase during the cell cycle. M phase is the period of actual nuclear and cell division during which the duplicated chromosomes are divided equally between two progeny cells. Cell division occurs during M phase, which consists of nuclear division (mitosis) followed by cytoplasmic division (cytokinesis). It includes several stages: prophase, metaphase, anaphase and telophase. Cytokinesis is another process that runs during telophase and it leads to the splitting of the cytoplasm.

[#465] First intergeneric hybrid between radish and cabbage was made by
Correct Answer

(D) Karpen Chenko (1927)

Explanation

Solution: The first intergeneric hybrid between radish and cabbage was made by Karpenchenko (1927). The first Raphanobrassica or "rabbage", an allopolyploid cross between the radish (Raphanus sativus) and cabbage (Brassica oleracea), was obtained by the Soviet agronomist Georgi Dmitrievich Karpechenko, in 1928. Plants of this parentage are now known as radicole. Two other fertile forms of Raphanobrassica are known.