Who invented electron microscope?

• Janssen

• Edison

• Knoll and Ruska

• Landsteiner

Which of the following is correct about the given figure?

• The length ofthe thick and thin myofilaments has changed.

• Length of both anisotropic and isotropic band has changed.

• The myosin cross-bridges move on the surface of actin and the thin and thick myofilaments slide past each other.

• Length of the sarcomere remains same.

Why are vascular bundles closed in monocots?

• Xylem and phloem are present.

• Xylem and phloem occur in separate bundles.

• Vascular cambium is present between xylem and phloem.

• Vascular cambium is not present.

Vitamin B₆ is also called

• thiamine

• pantothenic acid

• pyridoxine

• retinol

Protista differs from monera in having

• cell wall

• autotrophic nutrition

• flagella

• nuclear membrane

Refer the given figures on photoperiodism and select the correct option.

• A	B	C
  no correlation between light period and flowering	long light- exposure period	short light- exposure period

• A	B	C
  long light- exposure period	no correlation between light period and flowering	short light- exposure period

• A	B	C
  short light exposure period	long light exposure period	no correlation between light period and flowering

• A	B	C
  no correlation between light period and flowering	short light exposure period	long light exposure period

Gametophyte and sporophyte are independent of each other in which of the following groups?

• Pteridophytes

• Angiosperms

• Gymnosperms

• Bryophytes

Which of the following is correct?

• Paneth cells secrete pepsinogen

• Parietal cells secrete hydrochloric acid

• Argentaffin cells secrete mucus

• Chief cells secrete gastrin

What is correct about the movement of substance across the membrane in facilitated diffusion?

• It is an active transport

• It doesn't cause transport of molecules from low concentration to high concentration

• It is insensitive to inhibitors

• It is a very specific transport

What do A, B, C and D represent in the following figure?

• A : carrier protein, B: symport, C: uniport, D : antiport

• A : carrier protein, B : uniport, C: antiport, D : symport

• A: carrier protein, B: antiport, C: symport, D : uniport

• A : carrier protein, B: uniport, C: symport, D : antiport