CBSE 11TH BIOLOGY - Online Test
Q1. The property which doesn’t belong to nerve fibres is :
Answer : Option A
Explaination / Solution:
Nerve fibres are specialized to transmit impulses form one part of the body to other. Nerve fibres do not shows the property of elasticity and contractility.
Q2. An algae having ribbon shaped chloroplast is
Answer : Option C
Explaination / Solution:
The shape of a chloroplast varies from species to species. It may be cup-shaped (e.g., Chlamydomonas), (e.g., Vaucheria), Girdle (e.g., Ulothrix), Stellate or Star-shaped (e.g., Zygnema), Reticulate or net-like (e.g., Cladophora, Oedogonium), Spiral or ribbon or scalariform (e.g., Spirogyra), ovoid or disc or spheroid in higher plants
Q3. Cytoskeleton is made of
Answer : Option A
Explaination / Solution:
Cytoskeleton is a series of intercellular proteins that help a cell with shape, support andmovement. So, cytoskeleton is made up of proteinaceous filaments.
Q4. The site in chloroplast which is responsible for trapping for light energy is
Answer : Option C
Explaination / Solution:
The grana is responsible for trapping the light energy and converting it into ATP and NADPH during light reaction of photosynthesis.
Q5. Skin is the only respiratory organ in :
Answer : Option C
Explaination / Solution:
There are no special respiratory organs in Hirudinaria. In addition to its primary role of a protective covering, the skin also serves a respiratory function. It is provided with a rich supply of haemocoelomic fluid in an extensive system of capillaries and capillary loops, which penetrate into the spaces between the inner ends of the epidermal cells.
Q6. In Coelenterates, the cell shows
Answer : Option D
Explaination / Solution:
In coelenterates, the arrangement of cells is more complex. Here, the cells performing the same function are arranged into tissues, hence is called tissue level of organisation.
Q7. The inhibition of enzyme activity by the presence of a chemical that competes with the substrate for binding to the active site of the enzyme is called
Answer : Option C
Explaination / Solution:
The inhibition of enzyme activity by presence of a chemical that competes with thesubstrate for binding to the active site of the enzyme is called substrate analogue.
Q8. Where (a) is a neutrophil, identify the other four WBCs?
Answer : Option C
Explaination / Solution:
There are two main categories of WBCs – granulocytes and agranulocytes. Neutrophils, eosinophils and basophils are different types of granulocytes, while lymphocytes and monocytes are the agranulocytes.
Q9. Respiration is
Answer : Option B
Explaination / Solution:
Catabolism is process of break down of any large substance into smaller ones. In respiration, glucose is broken down into carbon dioxide and water molecules. Thus it is referred to as a catabolic reaction
Q10. The part that develops from the plumule of the embryo of a germinating seed is
Answer : Option B
Explaination / Solution:
The stem develops from the plumule of the embryo of a germinating seed.
