Injso

The organism whose body develops from two germ layers are called diploblastic, whereas the organism developed from three germ layers are called triploblastic. In some triploblastic organism the body cavity or coelom is formed from mesoderm and endoderm. Such an organism is called as [P ] and an example for it is [Q ] Choose the correct option to fill in the blanks in the above statement. 

(a) [P] – Coelomate; [Q]-Hydra 

(b) [P] – Coelomate ; [Q]-Planaria 

(c) [P] – Pseudocoelomate; [Q]- Pila 

(d) [P] – Pseudocoelomate ; [Q]- Ascaris

When two equimolar salt solutions are separated by a selectively permeable membrane, the movement of water molecule across the membrane depends on the water potential of the respective solutions. Water moves from higher water potential to lower water potential.Higher the concentration of ions in a solution; lower is its water potential. In an experiment, two compartments are separated by a specifically designed synthetic membrane that is permeable to water and urea and not to sodium chloride molecules.

Hint: MW of NaCl: 58.4 g/mol MW of Urea: 60 g/mol. In the above condition, which one of the following options best represents the movement of water and its reason? 

(a) Water moves into P, because P has higher concentration of non-penetrating solutes. 

(b) Water moves into P, because P has higher concentration of penetrating solutes. 

(c) Water moves into Q, because Q has higher concentration of non-penetrating solutes. 

(d) Water moves into Q, because Q has lower concentration of non-penetrating solutes.

Metals react with oxygen to form metal oxides. If the metals considered are K, Cs, Mg and
Sr, the correct order of the basic character of their oxides is 

A.  MgO>SrO>K₂O>Cs₂O

B.Cs₂O < K₂O < MgO < SrO

C. MgO<SrO<K₂O<Cs₂O

D. K₂O<MgO<SrO<Cs₂O

In a hypothetical situation, a cell was found to lack rough endoplasmic reticulum. Which one of the following activities was all likely absent in this cell?

(a) Transcription 

(b) Translation

(c) Synthesis of secretory

(d) Manufacture of fat molecules or lipids

(I) Alumina is nature occurs as a colourless mineral corundum. Being amphoteric it reacts with acids as well as alkalis. It is used to prepare anhydrous aluminium chloride by passing chlorine gas over heated mixture of alumina and carbon. Write the balanced chemical equation for the same.

(II) Double salts of the type M₂SO₄, M’₂ (SO₄)₃, 24H₂O are called alums.Here M is univalent ion such as Na+, K+ etc. Whereas M’ is a trivalent ion like Al³⁺ , Fe³⁺ etc. Potash alum [K₂SO₄, Al₂(SO₄)₃ . 24H₂O] the common alum is manufactured from alum shale which contains iron disulphide and aluminium silicate (Al₂O₃. xSiO₂) and that is roasted in excess air to yield aluminium sulphate and ferrous sulphate. Ferrous sulphate is removed by fractional crystallisation and calculated quantity of K₂SO₄ is added to the mother liquor which is concentrated to give crystals of alum. Write balanced chemical equation for roasting of alum shale.

In an experiment involving treatments to demonstrate transpiration, six experimental setups were as follows:

I. Woody plant with only leaves coated with Vaseline jelly.

II. Woody plant with only stem coated with Vaseline jelly

III. Woody plant without any coating of Vaseline jelly

IV. Herbaceous plant with only stem coated with Vaseline jelly

V. Herbaceous plant with only leaf coated with Vaseline jelly

VI. Herbaceous plant without any coating of Vaseline jelly

Cobalt chloride (COCl₂) paper (changes from blue to pink when wet) was attached to the leaves and stem.

The plants were cell watered and kept under adequate sunlight. The following were proposed :

Which of the above is/are correct ?

(a) I, II and V 

(b) Only II 

(c) III, IV and VI 

(d) Only V

Plant tissues where carbon fixation occurs are known as ‘source’. The product(s) formed is/are then transported to different parts of the plant body for its further utilization or storage, which is known as ‘sink’. Which of the following can be categorized as ‘source (P)’and ‘Sink (Q)’? 

(a) (P) endodermis of root; (Q) phloem cells of root 

(b) (P) epidermal region of assimilatory root; (Q) meristematic region ‘of assimilatory root 

(c) (P) parenchyma of beet tuber; (Q) phloem cells of root 

(d) (P) xylem tissue of a green leaf; (Q) phloem tissue of the adjacent green leaf

In the figure given, PQ is a long uniform coil of metal wire, V is a constant voltage source and ASB is a rheostat. Consider the following statements and choose the correct option.

I) The (equivalent) pole at the end P if slider S of rheostat is moved from A to B is North.

II) The (equivalent) pole at the end P if slider S of rheostat is moved from A to B is South.

III) The (equivalent) pole at the end P if slider S of rheostat is moved from B to A is North

IV) The (equivalent) pole at the end P if slider S of rheostat is moved from B to A is South.

(a) Only III and IV are correct 

(b) Only I and II are correct

(c) Only II and IV are correct 

(d) Only II and Iv are correct

Spermatogenesis and oogenesis are processes of formation of the male and the female gametes as shown below.

Answer the following question, related to gamete formation.

(I) If accidentally the primary oocyte is fertilized with a sperm, the resulting zygote will have how many sets of chromosomes:

(a) n 

(b) 2n 

(c) 3n 

(d) 4n

(II) The middle piece of the sperm contains: 

(a) Mitochondrial DNA only 

(c) Nuclear DNA only

(b) No DNA at all d) Nuclear and mitochondrial DNA both

III) The most plausible reason for the formation of polar bodies during oocyte development is 

(a) to retain large quantity of cytoplasm in the oocyte.

(b) to retain chromosomes in the oocyte.

(c) to retain both chromosomes and cytoplasm in the oocyte.

(d) to retain the egg membrane which is essential for fertilization.

IV) Which one of the following statements is true regarding normal oocyte development? 

(a) Primary oocytes are produced after a female attains puberty (post puberty).

(b) primary oocytes are already produced in the ovary when a girl is born.

(c) Primary oocytes are produced in the ovary just before the female attains puberty (pre puberty).

Some people face problems seeing distant objects clearly. They, however, have no problem seeing nearby objects. A person wears a spectacle with concave lenses to see distant objects. He is able to see nearby object clearly without using lenses. When this person is reading without using the spectacles the image will be formed ________ . 

(a) On the blind spot 

(b) Behind the retina 

(c) In front of the retina 

(d) In the fovea region on the retina.