What provides nutrition to human sperms? State the genetic constitution of a sperm.
The secretions of the prostate gland and seminal vesicle are responsible for providing nutrition to human sperms. The genetic constitution... View Article
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How is F2 progeny obtained by self-pollination of F1 progeny different from F1 progeny? Give reason for this observation.
In the F2 progeny, one-quarter of the plants are short and the rest are tall. It has 1:2:1 ratio of... View Article
Why is the F1 progeny always of tall plants when a tall pea plant is crossed with a short pea plant?
The progeny is not always tall, but most of the time tall because tallness is a dominant character and dwarfness is... View Article
Complete the following pathway showing the breakdown of glucose
(1) Pyruvate (3 carbon molecules) (2) Energy (3) Presence of oxygen (4) In Mitochondria (5) Carbon dioxide (6) Water ATP... View Article
Rate of breathing in aquatic organisms is much faster than that in terrestrial organisms. Give reasons.
The rate of breathing in aquatic organisms is much faster than in terrestrial organisms because the amount of dissolved oxygen... View Article
In the process of respiration, state the function of alveoli.
In the process of respiration, alveoli provide the surface within the lungs for the exchange of oxygen and carbon dioxide... View Article
Complete the following flow chart based on ecosystem and its components.
(i) Aquatic Ecosystem (ii) Abiotic (iii) Soil, Water, Wind (iv) Plants and Animals (v) An ecosystem can be defined as an interaction between the biotic... View Article
What is meant by trophic level in a food chain? Construct a terrestrial food chain with four trophic levels. The energy flow in a food chain is always unidirectional. Why?
Trophic Levels – The various steps in a food chain at which the transfer of food takes place are called trophic... View Article
From the elements Li, K, Mg, C, Al, S identify the (a) elements belonging to the same group. (b) element which has the tendency to lose two electrons. (c) element which prefers sharing of electrons to complete its octet. (d) most metallic element. (e) element that forms acidic oxide. (f) element that belongs to group 13.
(a) The elements belonging to the same group are Li, K. The s-block elements having only one electron in their... View Article
A chemical compound ‘X’ is used in the soap and glass industry. It is prepared from brine. (a) Write the chemical name, common name and chemical formula of ‘X’. (b) Write the equation involved in its preparation. (c) What happens when it is treated with water containing Ca or Mg salts?
(a) The chemical name is Sodium carbonate. Its common name is Washing Soda. The chemical formula of the compound in its hydrated form... View Article
In the electrolysis of water (a) Name the gases liberated at anode and cathode. (b) Why is it that the volume of gas collected on one electrode is two times that on the other electrode? (c) What would happen if dil. H2SO4 is not added to water?
(a) Gases liberated at anode and cathode are- Gas collected at cathode is → Hydrogen Gas collected at anode is... View Article
A shining metal ‘M’, on burning gives a dazzling white flame and changes to a white powder ‘N’. (a) Identify ‘M’ and ‘N’. (b) Represent the above reaction in the form of a balanced chemical equation. (c) Does ‘M’ undergo oxidation or reduction in this reaction? Justify.
(a) According to the question, the metal ”M” is the magnesium metal and the white powder ”N” is magnesium oxide. Magnesium is the most... View Article
Assertion (A): Carbon has a strong tendency to either lose or gain electrons to attain noble gas configuration. Reason (R): Carbon has four electrons in its outermost shell and has the tendency to share electrons with carbon or other elements. (i) Both (A) and (R) are true and (R) is correct explanation of the assertion (A). (ii) Both (A) and (R) are true, but (R) is not the correct explanation of the assertion (A). (iii) (A) is true, but (R) is false. (iv) (A) is false, but (R) is true.
(iv) (A) is false, but (R) is true. Explanation Carbon does not have a strong tendency to either lose or... View Article
An element X is forming acidic oxide. Its most probable position in the modern periodic table is (A) Group 1 and Period 3 (B) Group 16 and Period 3 (C) Group 17 and Period 3 (D) Group 2 and Period 3
(C) Group 17 and Period 3 Explanation Acidic nature of the oxides of elements increases across a period. This means... View Article
An element X with atomic number 12 forms a compound with element Y with atomic number 17. The formula of the compound formed is (A) XY (B) XY2 (C) X2Y (D) X2Y3
XY2 forms the ionic bond. The electronic configuration of X changes from 2, 8, 2 to 2, 8, as it donates its 2 electrons... View Article
If 10 mL of H2SO4 is mixed with 10 mL of Mg(OH)2 of the same concentration, the resultant solution will give the following colour with universal indicator: (A) Red (B) Yellow (C) Green (D) Blue
(C) green Explanation Sulphuric acid is a strong acid and magnesium hydroxide is a strong base, so naturalisation reaction takes... View Article
Strong heating of ferrous sulphate leads to the formation of a brown solid and two gases. This reaction can be categorised as (A) displacement and redox. (B) decomposition and redox. (C) displacement and endothermic. (D) decomposition and exothermic.
(B) decomposition and redox. Explanation The chemical reaction for strong heating of ferrous sulphate is written as: 2FeSO4(s) → Fe2O3(s)... View Article
Switching off unnecessary lights and fans and repairing leaking taps correctly defines which term of 5R’s? (A) Recycle (B) Reuse (C) Repurpose (D) Reduce
(D) Reduce Explanation Switching off unnecessary lights and fans and repairing leaking taps correctly defines reduce. The three R’s which... View Article
The values of mA and μA are (A) 10^–6 A and 10^–9 A respectively (B) 10^–3 A and 10^–6 A respectively (C) 10^–3 A and 10^–9 A respectively (D) 10^–6 A and 10^–3 A respectively
(B) 10–3 A and 10–6 A respectively Explanation 1mA = 1/1000A = 10−3A (mA=milliampere) 1μA = 1/1000000A = 10−6 A (μA=microampere) 1mA = 1000μA... View Article
A pregnant woman has TSH level of 8·95 mU/L. What care is needed for her?
Many women with hypothyroidism on thyroid hormone replacement therapy have TSH levels above the desired 2.5 mU/L level in early... View Article
