CBSE 11TH BIOLOGY - Online Test
Q1. Accessory pigments protect plants from
Answer : Option C
Explaination / Solution:
Other thylakoid pigments like chlorophyll b, xanthophylls and carotenoids, which are called accessory pigments, also absorb light and transfer the energy to chlorophyll a. Indeed, they not only enable a wider range of wavelength of incoming light to be utilized for photosynthesis but also protect chlorophyll a from photo-oxidation.
Q2. The correct sequence of respiration is i) Breathing in oxygen ii) Transportation of gases by the blood iii) Diffusion of gases between blood and tissues iv) Diffusion of gases across alveolar membrane v) Using of oxygen and releasing of carbondioxide
Answer : Option B
Explaination / Solution:
Respiration involves breathing or pulmonary ventilation by which atmospheric air is drawn in, Diffusion of gases across alveolar membrane, Transport of gases by the blood, Diffusion of gases between blood and tissues.Utilisation of oxygen by the cells.
Q3. Which of the following have notochord throughout life?
Answer : Option A
Explaination / Solution:
Amphioxus or lancelets are fish like marine chordates found in shallow temperate and tropical seas. They have notochord through out their life.
Q4. The protein portion of an enzyme is called as
Answer : Option B
Explaination / Solution:
Apoenzyme: The polypeptide or protein part of the enzyme is called the apoenzyme and may be inactive in its original synthesized structure.
The inactive form of the apoenzyme is known as a proenzyme or zymogen.
Q5. The following pie chart shows four components of blood plasma represented from first to fourth Qtr and the correct sequence will be :
Answer : Option B
Explaination / Solution:
90-92 per cent of plasma is water and proteins contribute 6-8 per cent of it. Plasma also contains small amounts of minerals and other materials such as glucose, amino acids, lipids, etc., arealso present in the plasma.
Q6. How many step reactions are involved in glycolysis?
Answer : Option A
Explaination / Solution:
Glycolysis is a series of reactions that and extract energy from glucose by splitting it into two three-carbon molecules called pyruvates. Glycolysis is an ancient metabolic pathway, meaning that it evolved long ago, and it is found in the great majority of organisms alive today. Glycolysis has ten steps.
Q7. Which part of the plant store food in garlic?
Answer : Option C
Explaination / Solution:
The fleshy leaves of onion and garlic store food.
Q8. Which one proceeds reformation of nuclear envelope during M-phase of cell cycle?
Answer : Option D
Explaination / Solution:
Before the completion of Mitosis reapperance of nuclear membrane takes place along with formation of nucleolus so that the cells bocemo separate enetities after cytokinesis but having same chromosome number as parent cells.
Q9. Towards the centre of the inner concave surface of the kidney is a notch called:
Answer : Option D
Explaination / Solution:
On the medial margin of the kidney is concave region called the renal hilum. The renal hilum is the entrance to the renal sinus. Structures such as the renal veins, artery, nerves and lymphatic vessels are located in the renal hilum.
Q10. The characteristic feature of which cells have lignified thickening at the corner?
Answer : Option C
Explaination / Solution:
Sclerenchyma consists of long, narrow cells with thick and lignified cell walls having a few or numerous pits.
