Agronomy - Study Mode

[#691] Most common herbicide used in maize is
Correct Answer

(C) Simazine

Explanation

Solution: Simazine is an herbicide of triazine class. It is used to control broad leaved weeds and annual grasses and most commonly used herbicide in maize crops. Simazine is an off-white crystalline compound that is sparingly soluble in water and comes in the category of residual non-selective herbicide.

[#692] Partheniumhysterophorus (Congress grass) can be controlled by
Correct Answer

(C) Zygogramma bicolarata

Explanation

Solution: Parthenium hysterophorus (Congress grass) is a species of flowering plant in the family Asteraceae. It is the common invasive species of India that invades disturbed land, including roadsides. It is a serious invasive weed of pasture systems, reducing pasture productivity by 90%. It can be controlled by Zygogramma bicolarata , a species of leaf beetle also referred to as Parthenium beetle.

[#693] Movement through Plasmodesmta
Correct Answer

(B) Symplastic movement

Explanation

Solution: Plasmodesmata are coaxial membranous channels that cross walls of adjacent plant cells, linking cytoplasm, plasma membranes and endoplasmic reticulum of cells. It allows the direct cytoplasmic cell to cell communication of both small and macromolecules. It involves symplastic movement of fluids and molecules which means the movement of water in between the cytoplasm and the vacuoles through plasmodesmata beyond the cortex of plant cells.

[#694] Father of hybrid cotton is
Correct Answer

(C) C. T. Patel

Explanation

Solution: Dr. C. T. Patel is known as the father of hybrid cotton. The world's first hybrid variety of cotton i.e. H4 was developed by the late Dr. C. T. Patel at Cotton Research Station, Surat, Gujarat in the year 1970. That is why he is known as the father of hybrid cotton. This hybrid because of its high yield potential became a popular variety among the farmers for cultivation.

[#695] The temperature known as Biological Zero
Correct Answer

(C) 5°C

Explanation

Solution: A temperature of 5°C is known as Biological Zero . This term was first published in the soil science literature in the first edition of soil Taxonomy, and it was described as the temperature below which biological or microbial activity is sufficiently low that reducing conditions do not readily develop in saturated soils.