Genetics And Plant Breeding - Study Mode

[#426] Double top cross refers to
Correct Answer

(A) (A × B) × OPV

Explanation

Solution: Double top cross refers to (A × B) × OPV. Double top crosses are the cross between a single cross and another inbred. The first generation resulted from the controlled crossing of a certified single cross (A X B) and a certified open-pollinated variety (OPV).

[#427] The transfer of pollen from the anther of a flower to the stigma of different flower is known as
Correct Answer

(B) Cross polination

Explanation

Solution: The transfer of pollen from the anther of a flower to the stigma of a different flower is known as Cross pollination. Cross-pollination is the process of applying pollen from one flower to the pistils of another flower. Pollination occurs in nature with the help of insects and wind. This process can also be done by hand to produce offspring with desired traits, such as colour or pest resistance.

[#428] When the pollination through insects, its called
Correct Answer

(B) Entomophily

Explanation

Solution: When pollination through insects, it's called Entomophily. Entomophily or insect pollination is a form of pollination whereby pollen of plants, especially but not only of flowering plants, is distributed by insects. Flowers pollinated by insects typically have bright colours, also have an attractive scent. And the ideal pollinating insect is hairy. The attractions offered are mainly nectar, pollen, fragrances and oils.

[#429] Match the following columns: Column I Column II a. PEP 1. Light reaction b. RuBP 2. Hatch and Slack cycle c. Hill reaction 3. Calvin cycle d. Blackmann 4. Dark reaction
Correct Answer

(D) a-2, b-3, c-1, d-4

Explanation

Solution: a. PEP is Phosphoenol pyruvic acid produced During Hatch and Slack pathway. PEP combines with CO 2 in the presence of enzyme PEP case, to form OAA. b. RuBP is involved in the Calvin cycle. RuBP is Ribulose bi phosphate, a 5-carbon molecule generated in Calvin cycle by using up 3 molecules of ATP. c. Hill reaction is also known as Light reaction. It is the light-driven transfer of electrons from water to Hill reagents (non-physiological oxidants) in a direction against the chemical potential gradient as part of photosynthesis. Robin Hill discovered the reaction in 1937. He demonstrated that the process by which plants produce oxygen is separate from the process that converts carbon dioxide to sugars. d. Blackmann’s reaction is also known as a dark reaction. The Blackman reaction is the name given to the rate-determining process. When photosynthesis is saturated with both light and carbon dioxide.

[#430] Water rises through the xylem mainly due to
Correct Answer

(C) Transpiration

Explanation

Solution: Water rises through the xylem mainly due to Transpiration. That can also be called a transpirational pull or suction pull. The tension created by transpiration “pulls” water in the plant xylem, drawing the water upward in much the same way that you draw water upward when you suck on a straw.