Agriculture - Online Test
Q1. Paper chromatography is technique to separate
Answer : Option D
Explaination / Solution:
Separation of leaf pigments of any green plant through paper chromatography. A chromatographic separation of the leaf pigments shows that the colour that we see in leaves is not due to a single pigment but due to four pigments: Chlorophyll a (bright or blue greenin the chromatogram), chlorophyll b (yellow-green), xanthophylls (yellow) and carotenoids.
Q2. ABO blood groups in humans are controlled by the gene I. It has three alleles - IA, IB and i . Since there are 3 different alleles, six different genotypes are possible. How many phenotypes occur?
Answer : Option D
Explaination / Solution:
The three alleles - IA, IB and i will form four different kinds of blood group A, B, AB and O. as IA and IB are dominant and i is recessive in nature.
Q3. In animal cells, the first stage of glucose break down is
Answer : Option A
Explaination / Solution:
In animal cells, like muscles during exercise, when oxygen is inadequate for cellular respiration pyruvic acid is reduced to lactic acid by lactate dehydrogenase. The reducing agent is NADH+ and H+ which is reoxidised to NAD+ in both the processes.
Q4. Which is not a function of leaves?
Answer : Option A
Explaination / Solution:
Leaves perform the function of photosynthesis, exchange of gases and transpiration to loose excess of water. Formation of new buds is not a function of leaves.
Q5. Within the embryo sac, three cells at chalazal end are called
Answer : Option D
Explaination / Solution:
The embryo sac is 8 nucleate, 7 celled structure. The three at micropylar ends are called egg Synergids and three at chalazal end are called antipodal cell. The remaining two at center forms the polar bodies.
Q6. Which epidermis of leaf contains more stomata?
Answer : Option A
Explaination / Solution:
Stomata is present more on the lower surface of leaf. The lower surface of leaf is called abaxial part of leaf that is away from direct sunlight to prevent excess of water loss.
Q7. In dicotyledonous plants, girth of stem and root increase due to
Answer : Option C
Explaination / Solution:
Secondary growth is the result of the activity of the two lateral meristems, the cork cambium and vascular cambium. Arising from lateral meristems, secondary growth increases the girth of the plant root or stem, rather than its length.
Q8. In bacteria asexual reproduction takes palace by
Answer : Option A
Explaination / Solution:
In bacteria, asexual reproduction occurs by endospore formation in favorable condition. In unfavorable condition, bacteria produce sexually or change into cyst.
Q9. Passive water absorption by root system is due to
Answer : Option C
Explaination / Solution:
Absorption of water by root system is passive due to tension in sap created by transpiration. No energy molecule is required in this process, so it is passive in nature.
Q10. Most active nitrogen fixer in Rice field is
Answer : Option C
Explaination / Solution:
Rice field contains large number of nitrogen fixing algae and bacteria. In which Aulosira fertilissima is most active nitrogen fixer in the rice field.
