Agriculture - Online Test
Q1. Osmotic pressure cannot became zero in a cell. It is zero only in case of
Answer : Option A
Explaination / Solution:
Osmotic pressure cannot become zero in cell as it always content some amount of solute particles. Osmotic pressure is zero only in case of pure water or distilled water.
Q2. Epiblast present in certain monocot embryo represents
Answer : Option A
Explaination / Solution:
Embryo of certain monocotyledonous seeds contain additional cotyledon besides one present in al monocots. This cotyledon represents the evolutionary stage of cotyledon formation from one to two.
Q3. The autotrophs that do not use solar energy for synthesis of food are called
Answer : Option A
Explaination / Solution:
The autotrophs are those organism that prepare their own food by using solar or chemical energy. The autotrophs that do not use solar energy for synthesis of food are called chemoautotrophs.
Q4. Both Pteridophytes and Gymnosperms possesses
Answer : Option C
Explaination / Solution:
Pteridophytes and Gymnosperms belongs to different division of plant kingdom but both of them possess Archegonia as female sex organ which produces female gamete for sexual reproduction.
Q5. Wavelength of PAR is
Answer : Option D
Explaination / Solution:
The wavelength of light in which photosynthesis light reaction can occurs is called PAR ( photosynthetically active radiation). The wavelength of 400-700 nm is PAR for most of the plants.
Q6. A polygenic trait is controlled by 3 genes A, B and C. In a cross AaBbCc × AaBbCc, the phenotypic ratio of the offspring was observed as 1 : 6 : x : 20 : x : 6 : 1. What is the possible value of x?
Answer : Option B
Explaination / Solution:
Polygenic trait controlled by three genes will form 8 types of gametes. Combination of 8 types of gametes of male and female each result into 64 types of zygote in different ratio. So, possible value of x is 15 (1:6:15:20:15:6:1).
Q7. The TCA cycle starts with
Answer : Option D
Explaination / Solution:
The TCA cycle starts with the condensation of acetyl group with oxaloacetic acid (OAA) and water to yield citric acid.
Q8. One animal that does not perform locomotion is
Answer : Option C
Explaination / Solution:
Sycon does not perform locomotion, although it is a animal. Syconremain attached to substratum and does not move from one place to other.
Q9. Main seat of photosynthesis in leaf is
Answer : Option A
Explaination / Solution:
The palisade parenchymatous cell in the mesophyll region has numerous chloroplasts. Hence, it is the main seat of photosynthesis in leaf.
Q10. Natural auxins among the following are: a) IAA, b) IBA, c) NAA and d) 2, 4 D
Answer : Option D
Explaination / Solution:
Auxins like IAA and indole butyric acid (IBA) have been isolated from plants.(naturally) NAA (naphthalene acetic acid) and 2, 4-D (2, 4-dichlorophenoxyacetic)are synthetic auxins.
