Horticulture - Study Mode

[#556] Double type of marigold is
Correct Answer

(B) Suvasini

Explanation

Solution: Suvasini is a Double type of marigold. This new hybrid bears double flowers on medium spikes. The flower buds are greenish in contrast to pinkish buds in 'Suvasini' and local double. It is a double-flowered multi-whorled variety released by the Indian Institute of Horticultural Research (IIHR), Bangalore. It is a cross between 'Single' and 'Double'. This variety produces more flowers per spike.

[#557] In metaphase stage of cell division chromosomes are arranged on
Correct Answer

(A) Equatorial plate

Explanation

Solution: In the metaphase stage of the cell, division chromosomes are arranged on the equatorial plate . It is a stage of mitosis in the eukaryotic cell cycle in which chromosomes are at their second-most condensed and coiled stage. The chromosomes, carrying genetic information, align in the equator of the cell before being separated into each of the two daughter cells. This can be referred to as the equatorial plate.

[#558] Method followed for the production of inbreds in Self-incompatible lines is
Correct Answer

(D) Both B and C

Explanation

Solution: The method followed for the production of inbreds in Self-incompatible lines is Sibbing as well as Bud pollination . Self-incompatibility (SI) is a general name for several genetic mechanisms that prevent self-fertilization in sexually reproducing organisms and thus encourage outcrossing and allogamy.
Sibbing is a process of pollinating an emasculated plant with pollen from a sister plant. The pollination taking place when the flower is in the bud condition is called bud pollination. It usually occurs in the flowers in which the stigma and the pollen grains mature or ripens even before the opening of the bud. Example Pea, Grass, etc.

[#559] Cowpea variety that is unaffected by day length is (Photo insensitive)
Correct Answer

(C) Pusa Dofasli

Explanation

Solution: The cowpea variety that is unaffected by day length (Photo insensitive) is Pusa Dofasli . This variety is released by IARI and is a cross between Pusa Phalguni × Philippine selections. It is photo insensitive, bushy cultivar, and suitable for both summer and rainy seasons. The crop comes to harvest in 55 - 60 days and yields about 7.5 - 8 t/ha.

[#560] Strains of Bt produce toxins, which confer resistance against
Correct Answer

(D) All of the above

Explanation

Solution: Strains of Bt produce toxins, which confer resistance against Lepidopteran larvae, Dipteran insects as well as coleopteran insects. Bt ( Bacillus thuringiensis ) strains synthesize Crystal (Cry) and cytolytic (Cyt) toxins, at the onset of sporulation and during the stationary growth phase as parasporal crystalline inclusions. Cry proteins are specifically toxic to the insect orders Lepidoptera, Coleoptera, Hymenoptera, and Diptera, and also to nematodes. B. thuringiensis serves as an important reservoir of Cry toxins for the production of biological insecticides and insect-resistant genetically modified crops.