1
In Oogenesis nutritive substance are synthesised during 1) Multiplication phase 2) Growth phase 3) Maturation phase 4) All the three
2 P – Block Elements
What is the n factor or valancy factor of ozone during the change 2O3? → 3O2?? 1) 2 2) 4 3) 6 4) 8
SOLUTION
2O3 → 3O2 2mole O3 ≡ 3mole O2=3×4eq.O2 ≡12 eq.O2 ∴1 moleO3=6eq.O2
3
According to the heterotroph hypothesis, autotrophs were able to evolve because heterotrophs made conditions more favorable by
Heterotrophs developed the ability to break down glucose, releasing the energy found within.
In this process, carbon dioxide is released as a waste product. Autotrophs were able to use this waste gas in photosynthesis.
4
The presence of DNA is important for cellular metabolic activities because DNA
Enzymes are necessary for most chemical reactions that occur in our bodies. DNA controls the production of proteins, of which enzymes are an example of, in a process called protein synthesis.
5
The name of group 'spermatophyta' is derived from their feature that they are
1) sperm bearing lower plants2) seed producing plants3) fruit producing plants4) sperm proddducing higher plants
6
The phyllotaxy found in guava is
1) Alternate 2) Opposite superposed
3) Opposite decussate 4) Both 2) and 3)
7 The Living World
The most convenient way for easy identification of plants and animals by applying diagnostic features is
1) Recognition 2) Preservation 3) Comparison. 4) Use of taxonomic keys
Solution
A taxonomic key can also be called a dichotomous key. A taxonomic key is designed to look at the similarities and differences between objects using a series of paired statements. There are two types of key. Indented or yoked key which gives two or more alternate characteristics which are used to make choice by rejecting or selecting. Bracketed key, the key does not separate by characters but subdivide them by giving them number in brackets.
8 P – Block Elements
When Reactivity of Halogen atom is minimum in
1) propyl oxide 2) propyl chloride 3) isopropyl chloride 4) isopropyl bromide
when carbonium is formed by isopropyl group it is more stable than that formed by n propyl group thus there reactivity will be more.
9 Biological Classification
Which of the following statement is associated with the flow of cytoplasm of an active Amoeba?
1) Propelled by microfilaments for lipid synthesis 2) An adaptation for extracellular digestion 3) Composed of microtubules and extracellular matrix 4) Dependent on microfilaments for intracellular circulation
Cytoplasmic streaming refers to rotational movement or streaming of liquid portion of cytoplasm (the cytosol) as mediated by actin filaments of the cytoskeleton. It helps in intracellular circulation of materials in Amoeba. Extracellular digestion in Amoeba is carried out by pseudopodia, not by cytoplasmic streaming.
10 Excretory Products and their Elimination
Each human kidney has nearly 1. 10,000 nephrons 2. 50,000 nephrons 3. 100,000 nephrons 4. 1 million nephrons
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