Justify the following statements on the basis of external features
(i) Underground parts of a plant are not always roots
(ii) Flower is a modified shoot

Which of the following statements, support the view that elaborate sexual reproductive process appeared much later in the organic evolution ? (i) Lower groups of organisms have simpler body design. (ii) Asexual reproduction is common in lower groups. (iii) Asexual reproduction is common in higher groups of organisms. (iv) The high incidence of sexual reproduction in angiosperms and vertebrates. Choose the correct answer from the options given below : (A) i, ii and iii (B) i, iii and iv (C) i, ii and iv (D) ii, iii and iv

Give scientific reasons for the following statements: The roots in plants grow against the direction of light.

Which of the following statements are false for asexual reproduction ? (I) Single parent is capable of producing offspring. (II) Offsprings are exact copies of their parent. (III) Zygote formation occur. (IV) It is slow and complex process. (A) I and II are false (B) I and III are false (C) III and IV are false (D) I and IV are false

State whether the following statements are true or false. Justify your answers. (ii) Every rational number is a real number.

State if each of the following statements is true or false. Give reasons for your answer. Total energy of a system is always conserved, no matter what internal and external forces on the body are present.

State which of the following statement are true. (i) {}=phi (ii) phi=0 (iii) 0={0}

Consider the following statements and choose the correct option :- (i) Sun is the only source of energy for all ecosystem on earth (ii) PAR is less than 50 percent in incident solar radiation