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Regarding the assertion and reason, choose the correct option.

Assertion [A]: Individuals affected with phenylketonuria exhibit mental retardation.

Reason [R]: The affected individuals lack an enzyme, phenylalanine hydroxylase which results in accumulation of phenylalanine in the body

Inner surface of the bronchi and bronchioles is lined by

Marchantia differs from Funaria in

Endodermis is also called __

Fusiform cells of a cambial ring during secondary growth produce

Histone protein synthesis occurs during

Human beings are placed under Primata because of:

Besides urination, another important activity in which water is substantially lost from the body is:

Which of these has centres to regulate body temperature?

Regarding Assertion [A] and Reason [R], choose the correct option.

Assertion [A] : Muscles can only pull on structures not push.

Reason [R] : Skeletal muscles are often arranged in pairs that pull bones in opposite directions.

Match the following plant parts with the vegetative propogation regions

Which among the following best explains the reason for growing concerns about the environment?



a. The developed countries are concerned about protecting nature.

b. Protection of the environment is vital for indigenous people and natural habitats.

c. The environmental degradation caused by human activities has become pervasive and has reached a dangerous level.

d. None of the above.

In meiosis, in which stage does the condensation of chromosomes occur?

Regarding assertion and reason, select the right option.

Assertion (A): Androecium and gynoecium are called essential whorls.
Reason (R): The two important units of sexual reproduction namely male and female gametes are produced by androecium and gynoecium respectively.

The following graph depicts changes in two population (a and b) of herbivores in a grassy field. A possible reason for these changes is that:

How many times does the Krebs cycle turn per glucose molecule?

Question 22
Match the organs in Column I with the words listed in Column II.

$\begin{array}{cc}& \\ ColumnI& ColumnII\\ \left(a\right)Rectum& \left(i\right)Mucous\\ \left(b\right)Gallbladder& \left(ii\right)Villi\\ \left(c\right)Stomach& \left(iii\right)Tastebuds\\ \left(d\right)Tongue& \left(iv\right)Faeces\\ \left(e\right)Smallintestine& \left(v\right)Bilejuice\end{array}$

Which of the following correctly explains extinction?

What is the significance
of step-wise release of energy in respiration?

Pick out the correct statements.

I. Cytokinins especially help in delaying senescence.

II. Auxins are involved in regulating apical dominance.

III. Ethylene is especially useful in enhancing seed germination.

IV. Gibberellins are responsible for immature falling of leaves.

The correct sequence of events related to nodule formation of legumes is

A. Formation of bacteroids

B. Growth of infection thread

C. Secretion of sugars, amino acids and flavonoids by roots

D. Chemotactic movement of Rhizobia towards legume roots

Terminalizaiton of chiasma begins during: