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Select the incorrect statement.

A Changes that occur during adolescence are controlled by hormones.
B First menstrual flow begins at puberty and is termed as menopause.
C Males start releasing sperms by puberty and remain reproductively active throughout their life.
D Endocrine glands release hormones directly into the bloodstream and these hormones are carried by blood to specific target sites.

Refer to the given table regarding differences between sexual reproduction in animals and plants.

Select the correct difference(s).

A (i) only
B (ii) and (iii) only
C (ii) and (iv) only
D (ii), (iii) and (v) only

A student builds two identical electromagnets using the same iron core. In the first, the wire is wound clockwise; in the second, it is wound counterclockwise. Both are connected to identical batteries. Which observation is most likely?

A Both will have the same poles at corresponding ends.
B Their magnetic strengths will differ, but poles remain same.
C Their poles will reverse, though strength remains same.
D Neither will act as a magnet.

Identify X in the given figure and select the correct option regarding this.

(i) X could be a microscopic, acellular organism that multiplies when it enters a living cell.
(ii) X could be a microscopic, multicellular organism that multiplies when it enters a non-living cell.
(iii) X could be a microscopic, acellular organism that may infect plants, animals, or bacterial cells and cause diseases.
(iv) X could be a microscopic, acellular organism with branched filaments, lacking chlorophyll, and having a brush-like structure.

A (i) and (iii) only
B (ii) and (iii) only
C (i), (ii) and (iv) only
D (ii), (iii) and (v) only

Identify P, Q and R in the given figures and select the correct statements regarding them.

(i) P could be an organism present in a soil suspension that has branched filaments, lacks chlorophyll and possesses a sac-like structure.
(ii) Q could be a unicellular, oval-shaped, biflagellated organism containing cup-shaped chloroplast found in pond water.
(iii) R could be a unicellular, motile, irregular shaped organism found in pond water.
(iv) P could be a unicellular organism found in pond water and it appears green due to the presence of green pigment.

A (i) and (iii) only
B (ii) and (iii) only
C (i), (ii) and (iv) only
D (i), (ii) and (iii) only

Refer to the given table regarding communicable diseases affecting humans.

Select the correct option.

A P- Yeast, Q- Chickenpox, R- Tuberculosis, S- Virus
B P- Bacteria, T- Kidney, U- Typhoid, V- Liver
C Q- Chickenpox, R- Tuberculosis, S- Bacteria, V- Intestine
D P- Bacteria, Q- Chickenpox, U- Typhoid, V- Intestine

Select the odd one out on the basis of plant part they are obtained from.

ATea
BCoffee
CRice
DGreen gram

Read the statements made by four friends and select the correct option regarding it.


A Vinay and Sanjay made correct statements while Jiya and Raj made incorrect statements.
B Raj, Jiya and Vinay made correct statements while Sanjay made an incorrect statement.
C Sanjay made a correct statement while Raj, Jiya and Vinay made incorrect statements.
D Jiya and Vinay made the incorrect statements while Sanjay and Raj made the correct statements.

There is a definite relationship between figures (iii) and (iv). Establish a similar relationship between the figures (i) and (ii) by selecting a suitable figure from the options that would replace the question mark (?) in figure (ii).


A
B
C
D

Read the following statements and select the correct option that identifies each statement as true (T) or false (F) ones.
(i) Natural disasters like earthquakes and tsunamis can trigger environmental pollution by generating large amounts of waste.
(ii) The Richter scale is used to measure the strength of cyclone.
(iii) Non-biodegradable wastes, such as plastic and metal, do not decompose easily and contribute to soil pollution.
(iv) Ozone holes are caused by harmful gases like chlorofluorocarbons, which allow the ultraviolet rays to reach the Earth.