Agriculture - Online Test
Q1. Seed dispersal helps the species to
Answer : Option A
Explaination / Solution:
Seeds have adaptive strategies for dispersal to new habitat and help the species to colonies in new areas. Dispersal may occurs physically or with the help of birds and other animals.
Q2. It is the technique of growing plants in above-ground strands provided with fine mist of normal solution.
Answer : Option B
Explaination / Solution:
Aeroponics is the technique of growing plants in above ground strands provided with fine mist of normal solution. It is used to know the deficiency symptoms of minerals.
Q3. Statement I: Asexual reproduction involves fusion of gametes.
Statement II: Asexually produced offspring are genetically identical.
Statement III: Asexual reproduction occurs in unfavorable condition only.
Statement II: Asexually produced offspring are genetically identical.
Statement III: Asexual reproduction occurs in unfavorable condition only.
Answer : Option B
Explaination / Solution:
In asexual reproduction, fusion of gametes do not takes place and asexual reproduction occurs in favorable conditions. As fusion of gametes do not takes place, all the individuals are genetically identical to each other.
Q4. In photosynthesis photolysis of water is used in
Answer : Option D
Explaination / Solution:
Breaking down of water molecules in presence of sunlight during photosynthesis is called photolysis of water. During photolysis of water reduction of NADP+ into NADPH takes place.
Q5. Apophysis of moss is
Answer : Option A
Explaination / Solution:
The sporophyte of moss is differentiated into three parts – foot, seta and capsule. The capsule in turn is differentiated into 3 regions a) apophysis- the sterile basal portion of capsule, it is in continuity with seta b) theca or body of capsule, which is the fertile region, and c) operculum the apical region of capsule .
Apophysis is rich in chloroplast and thus photosynthetic region of moss , it also provides nutrition to the developing sporangium .
Q6. Henking in 1891 observed a specific nuclear structure in 50% of sperms. He named this structure as
Answer : Option D
Explaination / Solution:
The specific nuclear structure in few insects and 50 percent of the sperm observed by Henking was named as X body. Although its role in sex determination was not known to his time.
Q7. When and where anaerobic respiration does occurs in man and yeast?
Answer : Option C
Explaination / Solution:
Anaerobic respiration in man occurs in muscle cells during sudden activity in cells to form lactic acid. In yeast anaerobic respiration occurs in absence of oxygen to form ethanol.
Q8. Exarch xylem is present in
Answer : Option C
Explaination / Solution:
The xylem in which protoxylemis outside and metaxylem is inside is called exarch xylem. This kind of xylem is found in roots of dicots.
Q9. Which pair of enzyme promotes femaleness in flowers?
Answer : Option D
Explaination / Solution:
Flower Sex Conversions :
- Gibberellins (GA3) promote maleness
- Ethylene and auxins promote femaleness
Q10. Which plant shows valvate aestivation?
Answer : Option B
Explaination / Solution:
When sepals or petals in a whorl just touch one another at the margin, without overlapping, as in Calotropis, it is said to be valvate.
