Agriculture - Online Test
Q1. The net direction and rate of osmosis depends on
Answer : Option D
Explaination / Solution:
The diffusion of water across a semi-permeable membrane from high concentration of water (or low solute concentration) to low concentration of water (or high solute concentration) is called osmosis.
The net direction and rate of osmosis depends on two factors: concentration gradient and pressure gradient.
Q2. The deficiency symptoms in nitrogen,potassium, magnesium is clearly visible first in
Answer : Option C
Explaination / Solution:
Nitrogen deficiency symptoms include poor plant growth, and leaves that are pale green or yellow.
Symptoms of potassium deficiency in plants include brown scorching and curling of leaf tips as well as chlorosis (yellowing) between leaf veins.
The main symptom of magnesium deficiency, chlorosis, or yellowing between leaf veins.
Q3. Rhodophyta are commonly called red algae because of the predominance of pigment
Answer : Option A
Explaination / Solution:
The algal class Rhodophyta are commonly called as red algae because it contain red pigment, r-phycoerythrin along with chlorophyll a and d.
Q4. Melvin Calvin use of radioactive in
Answer : Option D
Explaination / Solution:
The use of radioactive C-14 by him in algal photosynthesis studies led to the discovery that the first fixation product was a 3-carbon organic acid.
Q5. The phenomenon involved in formation of female gametophyte is known as
Answer : Option D
Explaination / Solution:
The process of formation of female gametophyte inside the ovary by meiotic and mitotic division is called megasporogenesis.
Q6. In blood group typing in human, if an allele contributed by one parent is IA and an allele contributed by the other parent is i, the resulting blood group of the offspring will be
Answer : Option D
Explaination / Solution:
Blood group alleles IA and i is A. As allele A is dominant over the allele i. O blood group appear only when both the alleles are i.
Q7. The enzyme which converts glucose into glucose -6- phosphate is
Answer : Option A
Explaination / Solution:
A hexokinase is an enzyme that phosphorylates hexoses (six-carbon sugars), forming hexose phosphate. In most organisms, glucose is the most important substrate of hexokinases, and glucose-6-phosphate is the most important product.
Q8. The degenerative and irreversible changes in the organism is known as
Answer : Option A
Explaination / Solution:
life cycle of organism’s starts from growth and development followed by reproductive phase. After that senescence phase starts in which degenerative changes starts which is generally irreversible and leads to death of organisms.
Q9. Which part of the plant help to hold the blade to light?
Answer : Option B
Explaination / Solution:
Thepetiole help hold the blade to light. Long thin flexiblepetioles allow leaf blades to flutter in wind, therebycooling the leaf and bringing fresh air to leaf surface.
Q10. Which among the following are elongated or tube like cells with thick and lignified walls and tapering ends?
Answer : Option D
Explaination / Solution:
Tracheids are elongated cells in the xylem of vascular plants that serve in the transport of water and mineral salts. Tracheids are one of two types of tracheary elements, vessel elements being the other.
