Agriculture - Online Test
Q1. Light harvesting complexes are made up of
Answer : Option D
Explaination / Solution:
Light harvesting complexes (LHC) within the Photosystem I (PS I) and Photosystem II (PS II). These are named in the sequence of their discovery, and not in the sequence in which they function during the light reaction. The LHC are made up of hundreds of pigment molecules.
Q2. Crossing over occurs at
Answer : Option B
Explaination / Solution:
Crossing over occurs at four strand stage of panchytene of meiosis-I. Each homologous chromosome has two stands. Exchange of gene occurs during this period.
Q3. In electron transport system, the two copper centres are found in
Answer : Option C
Explaination / Solution:
The enzyme cytochrome c oxidase or Complex IV,is a large transmembrane protein complex found in bacteria and the mitochondrion of eukaryotes.
The complex contains two hemes, a cytochrome a and cytochrome a3, and two copper centers, the CuA and CuB centers. The cytochrome a3 and CuB form a binuclear center that is the site of oxygen reduction.
Q4. Cup-like structure formed by adnation of sepals, petals and stamens is
Answer : Option D
Explaination / Solution:
In angiosperms a hypanthium is a structure where basal portions of the calayx, the corolla and the stamens form a cup-shaped tube.
Q5. In leaves, the ground tissue consists of thin-walled chloroplast containing cells are called
Answer : Option C
Explaination / Solution:
The tissues of a leaf that are located in between the layers of epidermis and carry on photosynthesis, consisting of the palisade layer and the spongy parenchyma. Most mesophyll cells contain chloroplasts.
Q6. Which one prevents premature fall of fruit?
Answer : Option A
Explaination / Solution:
They help to prevent fruit and leaf drop at early stages but promote the abscission of older mature leaves and fruits.
Q7.
Identify the organism and type of reproduction in figure below
Answer : Option B
Explaination / Solution:
Asexual mode of reproduction in yeast takes place by budding process in which small outgrowth develops on tips followed by karyokinesis. Same process is repeated several times to form chain of yeast cells.
Q8. If an osmotic system, one has a water potential of -1000 kPa while the other has -500kPa, which chamber has higher water potential?
Answer : Option A
Explaination / Solution:
Water potential of distilled water is 0. Presence of more solute reduce the water potential. So one having water potential -500 kPa is higher in comparison to one having -1000kPa water potential.
Q9. The endosperm cells in angiosperms are
Answer : Option D
Explaination / Solution:
Endosperm is the product of triple fission in which two polar nuclei fuse with one of the male gamete. Endosperm provide nutrient to the developing embryo
Q10. Salt nutrition is
Answer : Option B
Explaination / Solution:
Salt nutrition is process of increase in respiration rate during mineral absorption by roots from soil.
