Agriculture - Online Test
Q1.
Which organism is shown in figure below
Answer : Option B
Explaination / Solution:
The plants parts shown below is the leaf of Bryophyllum having small plantlets on its margin. The vegetative reproduction by leaves occurs in this species.
Q2. Pinus seeds cannot germinate without
Answer : Option C
Explaination / Solution:
The fungus provides minerals and water to the roots, inturn the roots provide sugars and N-containing compounds to themycorrhizae. Some plants have an obligate association with themycorrhizae.
Q3. The fusion of two polar nuclei with one male gamete is called
Answer : Option D
Explaination / Solution:
The process of fusion of two polar nuclei with one male gamete is called as triple fusion. The resulting cell becomes primary endosperm cells that forms endosperm.
Q4. Influx and efflux of H+ ions inside the cell change the
Answer : Option D
Explaination / Solution:
pH of a solution is depends upon hydrogen ions concentration. Influx and efflux of H+ ions inside the cell change the pH of solution present in soil.
Q5. Cycas is a gymnosperm as it has
Answer : Option C
Explaination / Solution:
The gymnosperms (gymnos : naked, sperma : seeds) are plants in which the ovules are not enclosed by any ovary wall and remain exposed, both before and after fertilisation. The seeds that develop post-fertilisation, are not covered, i.e., are naked. Since, Cycas has naked seeds, it belongs to gymnosperms.
Q6. Each photosystem has all the pigments forming light harvesting system also called as
Answer : Option D
Explaination / Solution:
Each photosystem has all the pigments (except one molecule of chlorophyll a) forming a light harvesting system also called antennae. These pigments help to make photosynthesis more efficient by absorbing different wavelengths of light.
Q7. The pairs of chromosomes present in human beings somatic cells are
Answer : Option C
Explaination / Solution:
In human beings 23 pairs of chromosomes are present out of which 22 pairs are called autosomes and 1 pair is called sex chromosome.
Q8. Aerobic respiration is common in
Answer : Option D
Explaination / Solution:
Aerobic respiration is the process that leads to a complete oxidation of organic substances in the presence of oxygen, and releases carbon dioxide, water and a large amount of energy present in the substrate. This type of respiration is most common in higher organisms.
Q9. Locomotory organ of annelida is
Answer : Option A
Explaination / Solution:
Locomotory organ of annelia is parapodia. Parapodiumare in form of lateral fleshy protrusions on the body surface that help in movement and capturing food.
Q10. Reticulate veination is characteristic in
Answer : Option C
Explaination / Solution:
Reticulate venation: In this type, the veins branch and unite forming a complicated network, All the veins are interconnected, like the strands of the net. Leaves of ‘Dicot plants’ generally have reticulate venation e.g., Hibiscus, Redgram
