CBSE 11TH BIOLOGY - Online Test
Q1. The mature seeds of plants do not possess endosperm because
Answer : Option D
Explaination / Solution:
The mature seeds of plants do not possess endosperm because, it gets used up by the developing embryo during seed development.
Q2. Kinetin was identified by
Answer : Option A
Explaination / Solution:
The discovery of Kinetin is comparatively more recent. Its credit goes to Miller et al (1955) who were working in Prof. Skoog’s laboratory at the University of Wisconsin on the growth of tobacco pith callus in culture and wanted it to grow indefinitely.
Q3. Sachin suffers from hypoparathyroidism. This can lead him to :
Answer : Option A
Explaination / Solution:
Hypoparathryrodism is the condition in which body secretes abnormally low level of parathyroid hormone. This deficiency may lead to hypocalcemia and tetany.
Q4. Largest single mass of lymphatic tissue in the body is
Answer : Option D
Explaination / Solution:
Spleen is the largest single mass of lymphatic tissue in body. Blood formation in foetus and newly born child takes place in spleen.
Q5. A plant that is partially heterotrophic is
Answer : Option B
Explaination / Solution:
Drosera plant is partially heterotrophic. This plants capture insects to fulfill its protein requirement although it performs photosynthesis also.
Q6. Which of the following statement is true with respect to the movement through apoplast?
Answer : Option D
Explaination / Solution:
The apoplastic movement of water occursexclusively through the intercellular spaces and the walls of the cells. Movement through the apoplast does not involve crossing the cellmembrane. This movement is dependent on the gradient. The apoplast does not provide any barrier to water movement and water movement is through mass flow.
Q7. The productivity of a soil depends upon the proportionate amount of deficient mineral is called
Answer : Option B
Explaination / Solution:
Justus von Liebig's Law of the Minimum states that yield is proportional to the amount of the most limiting nutrient, whichever nutrient it may be.
From this, it may be inferred that if the deficient nutrient is supplied, yields may be improved to the point that some other nutrient is needed in greater quantity than the soil can provide, and the Law of the Minimum would apply in turn to that nutrient.
Q8.
Read the following statements :
i. In ruminants cellulose digesting bacteria are present in digestive system.
ii. Such digestion by microbial activity is called Anaerobic digestion.
iii. Camels are ruminants lacking omasum chamber.
Answer : Option C
Explaination / Solution:
- In ruminants like cows, buffalos, cellulose digesting bacteria are present in digestive system that release cellulose enzyme.
- Anaerobic digestion is a collection of processes by which microorganisms break down biodegradable material in the absence of oxygen.
- Camel is a psuedo ruminants as it has only 3 chambers instead of 4.
Q9. While crying, tears come out of eyes but some watery fluid comes out of nose as well. This fluid is
Answer : Option D
Explaination / Solution:
While crying, tears come out of eyes. Sometimes water fluid also comes out of the nose as well. This water fluid coming out of the nose is due to excessive secretion of lacrimal glands.
Q10. The main plant body of the bryophyte is
Answer : Option C
Explaination / Solution:
The main plant body of the bryophyte is haploid. It produces gametes, hence is called a gametophyte.
